OSI SAF central
News and releases
The news and releases for the OSI SAF High Latitude processing centre are now also accessible via a RSS flux. You can easily syndicate to this flux by clicking on the RSS icon or by adding the address http://osisaf.met.no/news/news-rss.xml to your favourite News Reader.
10.01.2018 - Moving OSI SAF HL FTP and HTTP servers
The OSI SAF High Latitude FTP (ftp://osisaf.met.no) and HTTP (http://osisaf.met.no) servers will be moved to a new host tomorrow 11.01.2018 at 14:00 CET. This should have no practical implications for users, but in case you experience any unusual behaviour, please contact us at osisaf-manager(at)met.no.
07.01.2018 - Outage of Medium Resolution Sea Ice Drift product
The MR sea ice drift product (OSI-407) experienced an production outage between 5th and 6th January. The problem has been fixed and the processing is now back to nominal.
07.01.2018 - OSI SAF High Latitude FTP server outage
The OSI SAF High Latitude FTP server experienced an outage on 5 and 6th January, due to an internal upgrade that gave unexpected problems. The problem has been fixed and the FTP server is now back to nominal.
05.12.2017 - Sea ice concentration product delayed
Todays sea ice concentration product (OSI-401-b) was 3 hours delayed due to a production anomaly. The production is now back to nominal.
04.12.2017 - Removal of spurious ice from sea ice concentrattion product
An issue with the production chain for the sea ice concentration product (OSI-401-b) have caused some spurious ice to occur in the sea west off Iceland. The issue has resolved by additional masking. The update will be applied to products distributed from 2017-12-05 (labelled 20171204).
01.12.2017 - Global Sea Ice products GRIB and HDF5 formats to be discontinued
As announced earlier, the GRIB and HDF5 formats of Global Sea Ice products from OSI SAF are planned to be discontinued. The date for this change is 5 April 2018. Users are strongly encouraged to use the NetCDF format as soon as possible.
This message concerns the following products:
Currently, the products are provided in several formats (depending on the product and on the distribution mean) : GRIB, HDF5, NetCDF via HL FTP server osisaf.met.no and EUMETCast. On 5 April 2018, the distribution of GRIB and HDF5 formats will be discontinued. NetCDF3 format will be the unique format available for these products both on HL FTP server (osisaf.met.no), EUMETCast-Europe and EUMETCast-Africa.
Please get ready to switch to the NetCDF files and do not hesitate to contact the OSI SAF team in case you have any concerns about it. A GRIB encoder can be made available on request to users who need more time to adapt to the NetCDF product files.
27.11.2017 - Missing sector in sea ice products using AMSR-2 data
The AMSR-2 sea ice concentration (OSI-408) and LR sea ice drift product (OSI-405) distributed on 25th November have a large sector of missing data due to outage of AMSR-2 data from the provider JAXA. Todays product is nominal, as the AMSR-2 data stream came back to nominal yesterday.
For the multi sensor LR sea ice drift product, only the southern hemisphere product is affected, as AMSR-2 is the only sensor used during summer time.
17.10.2017 - Maintenance on High Latitude servers
MET Norway will perform maintenance and upgrades in the infrastructure of computer facilities on October 18. and October 25. between 09:30 and 11:30 UTC, and availability of OSI SAF High Latitude FTP and HTTP servers might be affected. Although actions are taken to avoid downtime by using failover mechanisms, the extent of the work may result in unavailabliity of services during the maintenance window.
29.09.2017 - Missing AMSR2 data in sea ice products
Due to an outage of AMSR2 data from JAXA, todays OSI SAF sea ice products using AMSR2 data have missing sectors or reduced quality where the AMSR2 data are missing. The most affected product is the OSI-408 AMSR2 sea ice concentration product where sectors have missing data. For the multi sensor products OSI-402c ice edge and OSI-405c LR ice drift other data than AMSR2 (SSMIS and ASCAT) are used in the missing sectors.
15.08.2017 - Maintenance on High Latitude server
Here will be a planned maintenance on the MET Norway infrastructure 16th August, between 09:00 and 13:00UTC. This might impact the availability of the OSI SAF High Latitude FTP, HTTP and THREDDS servers. Users may experience a handful of minute-long interruptions of the services if the maintenance goes as planned, or longer if we get unforseen issues.
If you experience problems after 13:00UTC, please notify us on
07.08.2017 - OSI SAF High Latitude L3 SST (OSI-203) product empty
The OSI SAF High Latitude L3 SST product (OSI-203) with date stamp 2017-08-07 0000UTC is empty due to a problem with the AVHRR pre-processing. This pre-processing is now back to nominal, and the next OSI-203 product should be produced as normal. The empty product will not be reprocessed.
05.07.2017 - Sea ice extent updates stopped
The daily updates of the sea ice extent figures that are available at
27.06.2017 - OSI-401-b to be updated on 4th July 2017
The previously announced update of the OSI-401-b product (see service message #1108 on 14.06.2017) will happen on 4th July 2017. The following changes will be made:
Until 4 July 2017, the filtered files will continue to be available for users to evaluate from ftp://osisaf.met.no/prod/ice/conc_filtered – in parallel with the existing operational product. The file names have the temoporary prefix "filtered_".
More information about the update is available here: http://osisaf.met.no/p/ice/updated_ice_conc.html
14.06.2017 - Updated OSI-401-b with filtered sea ice concentration variable
Spurious ice can occur in the OSI SAF sea ice concentration fields, due to uncertainty in the measurement over open water. This spurious ice is problematic for some users. An extra sea ice concentration field has been introduced, for which the sea ice concentration is filtered to remove spurious ice. The spurious ice is removed using two extra filters: a 2m air temperature and an open water filter. The OSI SAF sea ice concentration product OSI-401-b will be updated as follows: the existing (unfiltered) sea ice concentration field is replaced by a filtered sea ice concentration field and an additional masks variables has been added.
This change applies to the three available formats: NetCDF3, HDF5 and GRIB. In case some users still want to use the unfiltered sea ice concentration, they can use the additional "ice_conc_unfiltered" variable, which is available in NetCDF and HDF5 files (but not in the GRIB files). In addition to the filtered ice concentration variable, a “masks” variable has also been introduced, which contains the T2m, open water filter and climatology masks that were used to filter the ice concentration field.
As of 2017-06-13, the filtered files are available for users to evaluate –
in parallel with the existing operation product – from here:
The filtered ice concentration field is described in more detail in the PUM and validation report (see http://osisaf.met.no/p/ice/updated_ice_conc.html for information on how to access them).
30.05.2017 - Metop-A ASCAT data back to nominal
The data from Metop-A ASCAT is delivered as usual again and the sea ice edge and type
products are now using these data again.
29.05.2017 - Sea Ice Edge, Type and Drift produced without Metop-A ASCAT
Due to an instrument anomaly on the Metop-A ASCAT instrument, the OSI SAF sea ice edge (OSI-402-b), type (OSI-402-b) and low resolution sea ice drift (OSI-405-b) products are produced without ASCAT data since 28th May. Therefore, the OSI-402-b and OSI-403-b products are produced using SSMIS data only and OSI-405-b using SSMIS and AMSR-2 data.
26.05.2017 - Updating Sea Ice Edge, Type and Drift products
The current OSI SAF sea ice edge (OSI-402-b), sea ice type (OSI-403-b) and low resolution sea ice drift (OSI-405-b) products have been updated. The updated products, labelled OSI-402-c, OSI-403-c and OSI-405-c, will replace the current products on 30th May 2017.
The sea ice edge and type products have been updated with the use of GCOM-W1 AMSR-2 and Metop-B
ASCAT data in the multi-sensor analysis. Except from this there is no change in product
specification or file format. Updated documentation is available here:
The low resolution sea ice drift product have been updated to also provide ice drift vectors during summer periods. It now also contains uncertainty estimates and has included Metop-B ASCAT data. More information about the drift product is provided here: http://osisaf.met.no/p/ice/index.html#lrdrift-demo
For questions, contact us on email osisaf-manager(at)met.no.
12.05.2017 - New version of the OSISAF Sea Ice Concentration Climate Data Record
The EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSI SAF) team is pleased to announce the release of OSI-450, a new full reprocessing of its Sea Ice Concentration (SIC) Climate Data Record (CDR). The release provides a SIC CDR over the polar regions, derived from passive microwave satellite data of SMMR, SSM/I and SSMIS, covering years 1979 to 2015.
This is the second version of such a sea ice concentration CDR by the OSI SAF. The basic principles and methodologies that were the backbone of our previous CDR (OSI-409) are still featured in OSI-450 (e.g. atmospheric correction of brightness temperature with NWP re-analysis data, state of the art algorithms, dynamic tie-points, uncertainties, etc...). They were nevertheless all revisited for this new release, through dedicated R&D in the OSI SAF project and in the ESA Climate Change Initiative (http://cci.esa.int) Sea Ice projects, whose contribution is acknowledged. Key improvements embedded in OSI-450 are more accurate and stable algorithms, open water filters to limit false ice detection over the ocean, and more realistic uncertainty estimates.
We hope the OSI-450 can be of interest for your applications and research,
and stay available for any questions you might have on this CDR at
A small change in the processing of the OSI SAF AHL SSI and DLI products
(OSI-301 and OSI-302) will be implemented starting from 4th May 2017 (tomorrow).
This change is only in the input data, as ECMWF NWP data will be used instead
of HIRLAM NWP data.
Any questions/comments can be sent to osisaf-manager
16.03.2017 - Release of AMSR-2 sea ice concentration product
We are pleased to announce that the High Latitude Level 3 Global AMSR Sea
Ice concentration product will be operational available on March 16th 2017.
More information about this new product can be found here:
26.01.2017 - Release of High Latitude L2 SST+IST product
The High Latitude L2 Sea and Sea Ice Surface Temperature product is now
operationally available on EUMETCast and FTP.
This product, in GHRSST compliant netCDF format, is a stand-alone High
Latitude Level 2 Surface Temperature product. It consists of Sea and Sea Ice
Surface temperatures (SST and IST) and an unvalidated test temperature field,
Land Ice Surface Temperature (LIST) for the Greenland and Antarctic ice caps.
More information about the product is available at http://osisaf.met.no/p/ice/index.html#sst-ist-l2
19.01.2017 - FTP server back to nominal
The OSI SAF High Latitude FTP server was unavailable earlier today due to an internal network problem. Therefore the sea ice products and High Latitude SST and Flux products were unavailable through FTP. The FTP server is now back to nominal.
08.12.2016 - Spurious ice in sea ice concentration product
The new OSI-401-b product (introduced in May to replace OSI-401-a) contains spurious ice measurements in the ice concentration fields. The principle causes of the spurious ice are believed to be as follows:
We are working on a solution to remove the spurious ice; however, it will
take some time to validate it and make it operational. As an interim
solution, we have developed a Python program, to filter the spurious ice
using the ice edge product, which can be downloaded from here:
We apologise for any inconvenience that this has caused you. We will update you when we have a solution to remove the spurious ice, while keeping the valid ice.
21.11.2016 - Missing continuous reprocessed ice concentration product
Due to the previously announced outage of SSMIS data from NOAA (on 18.10.2016), the continuous reprocessed
sea ice concentration product (OSI-430) with date stamp 20161017 that was supposed to be delivered on
18th November is missing, and will not be delivered, as the data are lost.
21.10.2016 - Updated geolocation in archive of sea ice products
The archive of global sea ice concentration, edge and type products on NetCDF/CF format has now been updated to partly correct for the misplacement error previously announced (on 21.09.2016) and corrected on the near-real-time production (on 27.09.2016). All netCDF/CF files since 2005 are modified.
The update of the archived netCDF/CF files does not completly correct the misplacement error, as there is a residual error of ~3km that we can not correct. The new netCDF/CF files are available under ftp://osisaf.met.no/archive/ice, and the change is documented in the global attributes to each file.
The GRIB and HD5 files in the FTP archive are not modified, as they either do not suffer from the misplacement error at all (the sea ice concentration OSI-401-a product) or only exhibit the residual misplacement error of ~3km that cannot be corrected (the sea ice edge and type products).
18.10.2016 - Missing/empty sea ice products
Due to an outage of SSMIS data from NOAA, all OSI SAF sea ice products based on SSMIS data
(OSI-401b, 402b, 403b, 404) are missing or with no data coverage in today's product (date
label 20161017). The SSMIS data stream is now back again, and the products should be
distributed as nominal again tomorrow morning.
This outage do not affect the MR and LR ice drift product (OSI-405b and OSI-407).
30.09.2016 - Continuous reprocessed sea ice concentration product back to nominal
The production of the OSI SAF continuous reprocessed sea ice concentration product (OSI-430) is back to nominal, after a problem with the production system. The previously missing products are available through FTP, together with the latest products: ftp://osisaf.met.no/reprocessed/ice/conc-cont-reproc/v1p2/
21.09.2016 - Update to fix geolocation issue on sea ice products
The small misplacement error (max ~7km) in the land mask and geolocation of the OSI SAF sea ice
concentration (OSI-401-b), sea ice edge (OSI-402-b) and sea ice type (OSI-403-b) products on the
polar stereographic grid will be fixed on 27th September 2016. A shift in the grid position will be
applied to the products distributed on this date (with date stamp 26.09.2016) and onwards.
This shift will change the grid latitude and longitude of the products, while the land mask
is unchanged and will keep its position in the grid.
For questions, please contact firstname.lastname@example.org.
26.08.2016 - Land mask and geolocation issue on sea ice products
As announced last week, an issue with the grid of the operational OSI SAF sea ice concentration product
was recently discovered. This issue has now been further investigated, and it turns out that there is a
small error in the geolocation of some of the sea ice products and of the land mask that is applied in
these products. These geolocation errors are small, less than one product grid box size. They affect
the ice edge, type and concentration products and they affect differently the various file formats
(hdf5, GRIB, netCDF).
We are sorry for the inconvenience this might have caused.
12.08.2016 - Unexpected shift in ice concentration grid
The Sea Ice Concentration product delivered from OSI SAF was upgraded on 25th May 2016. This upgrade
resulted in an unexpected shift in the product grid, a 10km shift in the y-direction. This shift is
in all files with date stamp 25.05.2016 and later, and is still present in the files currently being
distributed. This issue only concerns the Sea Ice Concentration product (OSI-401-b). The sea ice team
is working on solving this issue.
We are sorry for the inconvenience this might have caused, and hope to soon solve this issue.
04.08.2016 - Stopping distribution of OLD ice concentration product
The distribution of the OLD OSI SAF sea ice concentration product (OSI-401-a) on EUMETCast will be stopped on Tuesday 9th August. The NEW sea ice conc product (OSI-401-b) will still be distributed. This new product replaced the old product in May, and the old product has only been distributed until now for users to adapt to the new product.
04.08.2016 - Sea ice production back to nominal
As announces throgh service messages, there was an outage of the OSI SAF sea ice emissivity product (OSI-404) yesterday. The sea ice concentration product has also been experiencing some problems with interpolation of data around the pole hole. These issues was due to problems with the reception of input SSMIS data. The problems has been solved and the production is now back to nominal.
24.06.2016 - Updated Climatological Filtering For Global Sea Ice Concentration
The climatological filtering in the processing of the OSI SAF sea ice concentration product (OSI-401-b) has been updated to better represent the sea ice conditions in the following regions:
20.06.2016 - Missing sector in sea ice edge product
Due to partly missing SSMIS data from DMSP F18 the OSI SAF sea ice edge product for the Southern Hemisphere distributed today (labelled 20160619) has a sector of missing data. The reception of SSMIS data is back to nominal, so tomorrows products should be complete.
09.06.2016 - Summer sea ice drift available
We are pleased to announce the pre-release (with status DEMONSTRATION)
of OSI-405-c the next version of the OSISAF Global Low-Resolution
Sea Ice Drift product (OSI-405 series).
Note that the sea ice drift vectors during summer (May-September in NH, November-May in SH) are mainly processed from the 18.7 GHz imagery of JAXA's GCOM-W1 AMSR2 instrument. The summer motion fields are of lower accuracy and coverage than those processed during the winter season, and this is reflected in the new uncertainty fields. Pay attention to the increased number of interpolated vectors (in variable status_flag).
We aim at full OPERATIONAL implementation in the course of fall 2016.
23.05.2016 - Upgrade of OSI SAF sea ice concentration product
The final date for the previously announce upgrade of the OSI SAF sea ice concentration product OSI-401-b has been set to 26.05.2016. The OSI-401-b will be replacing the current operational concentration product OSI-401-a on this date, so that the ice concentration files distributed on EUMETCast and FTP will be OSI-401-b.
More information about the upgrade is provided here: http://osisaf.met.no/p/ice/new_ice_conc.html
26.04.2016 - OSI SAF continuous reprocessing back to nominal
The OSI SAF continuous reprocessed sea ice concentration offline product (OSI-430) is back to nominal production and distribution, now with SSMIS data from DMSP F18. Production has been rerun with SSMIS F18 data to cover the missing dates since 13th April, and all data are available on our ftp server ftp://osisaf.met.no/reprocessed/ice/conc-cont-reproc/v1p2/2016/03/
14.04.2016 - Update 2 on OSI SAF sea ice products upgrade
The OSI SAF off line product OSI-430 with updates to the reprocessed ice concentration data
set, has also been temporary turned off, to complete implementation of use of SSMIS data from
DMSP F18. The production of OSI-430 is expected to be back in nominal production 21th
13.04.2016 - Update on OSI SAF sea ice products upgrade
As previously announced, the OSI SAF sea ice products are being upgraded to use SSMIS
data from the DMSP F18 satellite instead of the DMSP F17 satellite. The current status
of this upgrade is:
11.04.2016 - Switch to SSMIS from DMSP F18 for OSI SAF sea ice products
Due to the previously reported problems with one of the channels on SSMIS onboard DMSP F17,
OSI SAF is now working on replacing DMSP F17 with DMSP F18 in our sea ice products.
Currently, the switch to F18 has been implemented for the ice concentration product
(OSI-401). The product dated 20160410 has been reprocessed and is available on our FTP
server, ftp://osisaf.met.no/prod/ice/conc/ and ftp://osisaf.met.no/archive/ice/conc/2016/04
We are sorry for the inconvenience these problems might have caused. We will report on the quality of the products with the new sensor as soon as more data are available.
11.04.2016 - Still degraded sea ice products
There are still problems with degraded OSI SAF sea ice products, due to degraded SSMIS F17 data. The OSI SAF sea ice team will look closely on the problem today and evaluate the possible options for actions.
This problem do no affect the MR ice drift product (OSI-407). We are sorry for the inconvenience that this problem is causing. More information on www.osi-saf.org
10.04.2016 - Degraded sea ice products
There is unfortunately still problems with degraded OSI SAF sea ice products, due to degradation in some of the SSMIS F17 orbits. This results in false ice in some areas in the OSI SAF sea ice concentration (OSI-401), edge (OSI-402) and type (OSI-403) products, and to some extent the emissivity (OSI-404) and LR drift (OSI-405) products.
This does not affect the MR ice drift product (OSI-407). More information on www.osi-saf.org
08.04.2016 - Degraded sea ice concentration product
The OSI SAF sea ice concentration product for the northern hemisphere distributed today (with label 20160407) was degraded due to corrupted SSMIS data. The corrupted data is hopefully a temporary problem, so that tomorrows product will be back to nominal.
07.04.2016 - OSI SAF sea ice products back to nominal production
The OSI SAF sea ice products are back to nominal production today, after the missing SSMIS data from NOAA yesterday.
06.04.2016 - Missing sector in OSI SAF sea ice products
The OSI SAF sea ice products distributed this morning (labelled 20160405) have a sector of missing data due to SSMIS data outage yesterday. The data provider (NOAA) is looking into the problem. Service message will follow when we have more news from NOAA.
01.03.2016 - Degraded ice edge, type and drift products
Todays global ice edge and type products (OSI-402, OSI-403 and OSI-405), labelled 20160229, were degraded due to large missing sectors. This was caused by a processing error. The error has been corrected and new complete products have been distributed to our FTP server (ftp://osisaf.met.no).
26.01.2016 - Postponed Product Upgrade and Resolved Spurious Ice in OSI-401-b
We have earlier announced that we will upgrade the OSI SAF ice concentration
product from OSI-401-a to OSI-401-b today (26. Jan. 2016), see announcement
from 29 Oct. 2015.
Note that the issue with false ice in lakes in the new product (OSI-401-b), see announcement from 29 Oct. 2015, is resolved. Since 19 Jan. 2016 the OSI-401-b product is disseminated with a new mask for the Northern Hemisphere to remove data from regions affected by land spillover (which causes spurious ice in the measurements). In particular, the mask removes ice concentration measurements for much of the Baltic Sea and lakes:
More information is provided here: http://osisaf.met.no/p/ice/new_ice_conc.html
19.01.2016 - MR Ice Drift archive update
Last August (Aug. 14th 2015), we announced that the MR Ice Drift products (OSI-407) carried incorrect dates, where the start- and end-date stamps are shifted by one day and the given time-of-day stamps were correct.
The attribute dates in the NetCDF file header were shifted likewise:
Current erroneous start_date: "2015-08-12 18:31:00 UTC"
Since Sep. 7th 2015 we distribute the files with correct time stamps. However, we announced that the products in the OSI SAF product archive still carry the wrong timestamps. That issue is resolved now. We have updated all of the products in the OSI SAF archive (ftp://osisaf.met.no/archive/ice/drift_mr) so that they carry the correctdates in the filenames and in the start_date and stop_date attributes in the NetCDF headers.
14.01.2016 - Degraded AHL SST product (OSI-203)
The AHL SST (OSI-203) product distributed this morning (time stamp 201601140000) contained no data, due to a failure in the cloud masking chain. The cloud masking chain has been updated, and the production of SST should be back to nominal.
23.11.2015 - New article featuring the OSISAF Low-resolution sea ice drift product (OSI-405)
A new JGR Oceans paper by Sumata et al. derives empirical error functions for six Arctic sea ice drift products on a monthly basis. The OSI-405 is one of the products under study and shows best accuracies against SAR-based reference ice drift dataset.
Sumata, H., R. Gerdes, F. Kauker, and M. Karcher (2015), Empirical error functions for monthly mean Arctic sea-ice drift, J. Geophys. Res. Oceans, 120, doi:10.1002/2015JC011151.
09.11.2015 - Report on flux validation data available
A new report has been published from OSI SAF about the validation data used for
validating the high latitude surface radiative flux products. The report is available
29.10.2015 - Postponing upgrade of sea ice concentration product
The announced upgrade on 3rd November of the OSI SAF sea ice concentration product is postponed
until 26th January 2016.
The parallel distribution will continue until 26th January. More details will be provided when the issue with false ice in lakes have been resolved.
15.10.2015 - Degraded OSI SAF sea ice products
A sector in today's Southern Hemisphere OSI SAF sea ice concentration and edge products are degraded, due to corrupted input SSMIS satellite data. We recommend that the users use yesterdays (labelled 20151013) product instead of today's (labelled 20151014). Hopefully, the input data will be back to nominal in tomorrows product.
01.10.2015 - Missing ASCAT data in OSI SAF sea ice products
Due to a stop in the reception of ASCAT data at MET Norway, todays (timestamp 20150930) OSI SAF sea ice edge, type and low resolution products did not use ASCAT data. Since these are multi sensor products, the products have still been delivered, but based only on SSMIS data (and AMSR-2 for ice drift).The reception of ASCAT data is now back to nominal and tomorrows product should be including ASCAT data again.
18.09.2015 - Missing sector in Southern Hemisphere ice concentration product
The sea ice concentration product for Southern Hemisphere has been missing data in a small sector in the inner ice close to the ice shelves boarder for the products the last couple of days, from 14-16th September. This was due to a bug in the input data filtering. This has now been corrected and the products are back to nominal coverage.
Products before 14th September were not affected by this bug. The affected products have been
reprocessed and are available on our ftp server:
16.09.2015 - Degraded coverage in today's sea ice products
Missing DMSP SSMIS data from Monterey/FNMOC resulted in reduced coverage and missing data in today's sea ice products (concentration, edge, type) in both hemisphere.
We are receiving fresh DMSP SSMIS data and tomorrow's product should have nominal coverage.
15.09.2015 - LR Sea Ice Drift product delayed on EUMETCast
The OSI SAF LR Sea Ice Drift product was delayed on EUMETCast this morning due to a processing environment
error that was introduced during the upgrade yesterday. The problem has been corrected and the production
is back to nominal.
08.09.2015 - Date error in the Medium Resolution ICEDRIFT (OSI-407) production resolved
The OSISAF medium resolution ice drift product (OSI-407) is back to nominal production and is again distributed again via EUMETCAST and the OSI SAF High Latitude FTP server (ftp://osisaf.met.no/prod/ice/drift_mr) since yesterday night (7th September 2015).
The distribution was stopped on Aug 14 2015 due to an error in the
production chain, which led to shifted start- and end-date stamps. The
error is fixed now.
07.09.2015 - Updating Sea Ice Edge, Type and LR Ice Drift
On 15th September the OSI SAF Sea Ice Edge, Type and LR Ice Drift products (OSI-402, 403 and 405)
products will be updated with improved versions, as previously announced. The change will be effective
from the products delivered on 15th September, labelled with product date 14th September. More details
about the improved products are available here:
We would specifically like to remind the users that there are some changes in the format of the
LR ice drift product, and no changes in the format for the ice edge and ice type products.
28.08.2015 - Sea Ice Emissivity Reduced Coverage
Over summer some Sea Ice Emissivity products did not cover their complete area. There are, especially on the southern hemisphere, sectors of variable size with missing data. The issue started to appear on 30. May 2015 and persisted until 21. Aug. 2015. Please find a list of affected products below.
The problem is resolved now and products from 21. Aug have a complete coverage again. The issue was caused by a bug in the input file decoding queue. We are sorry for the inconvenience.
19.08.2015 - Erroneous sea ice concentration data files
The sea ice concentration, edge, type and emissivity (OSI-401, 402, 403 and 404) files dated 20150806 contain erroneous data from the DMSP F17 SSMIS instrument in the Barents Sea and Kara Sea regions. The data files have therefore been marked "_erroneous" in the online archive. It is advices not to use these products.
26.07.2015 - New continuous reprocessed sea ice concentration offline product
The OSI SAF sea ice team is pleased to announce the release of the global continuous reprocessed sea ice concentration offline product (OSI-430). This product is a continuous reprocessing to continue the OSI SAF reprocessed sea ice concentration data set (OSI-409-a) that covers the period 25th October 1978 - 15th April 2015.
This offline product is a daily product, is delivered with a monthly delay (33 days) and is available since 16th April onwards.
More details about the data set is available here:
For further questions about this offline product, please contact us at:
07.07.2015 - Improved sea ice products
The OSI SAF sea ice team is now ready to introduce improved versions of the sea ice concentration, edge, type and low resolution products. In an overlapping period both the new and old products will be available, for users to test the new products before the new products fully replaces the existing products.
More details about the improved ice concentration product is available
More information about the improved ice edge, type and ice drift products
are available here:
01.07.2015 - Sea ice products degraded
Todays OSI SAF Sea Ice products (except the MR ice drift) are degraded with a sector of the products missing. This is due to data outage of SSMIS data from NOAA/NESDIS yesterday. The SSMIS data flow is not back to nominal at time of writing (Wed Jul 1 07:26:32 UTC 2015).
15.06.2015 - New version of reprocessed sea ice concentration data set
The OSI SAF sea ice team is pleased to announce the release of the updated version 1.2 of the
reprocessed sea ice concentration data set (OSI-409-a). The data set now covers the period
Oct 1978-Apr 2015. Version 1.2 is an extension in time of version 1.1 (OSI-409), adding the period
from October 2009 to April 2015. There is no change in the algorithms or processing chain used.
More details about the data set is available here:
Quicklooks of the data set are available here:
Later in June, the OSI-430 off-line product will become available, which will deliver continuous updates
of this data set with one month delay.
06.05.2015 - MR Sea Ice Drift production back to nominal
The dissemination of OSI SAF products has resumed this morning.
That is, due to an anomaly in the processing chain, there was
only one product (S-OSI_-DMI_-MTOP-NH_MRSIDRIFT-201505040613Z.nc)
dissiminated yesterday, instead of two.
05.05.2015 - MR Sea Ice Drift product outage
Due to an anomaly in the processing chain the dissemination of
OSI SAF Medium Resolution Sea Ice Drift products is stopped until
16.04.2015 - Sea ice products degraded
Todays OSI SAF Sea Ice products (except the MR ice drift) are degraded with a sector of the products missing. This is due to data outage at NOAA/NESDIS yesterday. The production is back to nominal now.
12.04.2015 - Sea Ice Emissivity Distribution delayed
The dissemination of OSI SAF emissivity products this morning was delayed due to a server problem. The distribution is resumed and products are available.
25.03.2015 - Sea Ice Emissivity Distribution Resumed
The dissemination of OSI SAF emissivity products has resumed. The product corresponding to day 2015-03-24 has been distributed with approximately 24 hours delay. This was due to an error in the production chain. Distribution should be back to normal from now on.
25.03.2015 - OSI SAF AHL SST product delayed
Due to a network outage yesterday, the OSI SAF AHL SST product with date label 201503241200 was not distributed as expected. The missing product files have now been uploaded to the product FTP server.
25.03.2015 - Global sea ice concentration product degraded
Todays OSI SAF sea ice concentration product (OSI-401, date label 20150324) is degraded with missing data in parts of the product. This was caused by a network outage. The production is noew back to nominal.
25.03.2015 - Global sea ice emissivity product outage
Due to an anomaly in the processing chain the dissemination of OSI SAF Sea Ice Emissivity products is stopped until further notice. We are working to correct the problem.
12.01.2015 - MR Ice Drift production back to nominal
The production of OSI SAF Medium Resolution Sea Ice Drift products (OSI-407) is back to nominal.
11.01.2015 - MR Ice Drift production outage
Due to an anomaly in the processing chain the dissemination of OSI SAF Medium Resolution Sea Ice Drift products (OSI-407) is stopped until further notice. We are working to correct the problem.
11.12.2014 - MR Ice Drift production back to nominal
The production of the MR Ice Drift product (OSI-407) has had some problems recently and some products have been delayed. The problems have now been fixed and the production is back to nominal.
21.10.2014 - OSI SAF High Latitude FTP and web server unavailable on 29.11.2014
Due to a major maintenance in the data storage facilities at MET Norway on 29th November 2014, the OSI SAF High Latitude FTP, THREDDS and web server will be partly unavailable during this maintenance. The maintenance will last from 07 UTC to 17 UTC, and the services will at least be unavailable from 11 UTC to 13 UTC, probably longer.
This maintenance will affect availability of all OSI SAF Sea Ice products and the AHL SST, SSI and DLI product during this period through FTP and THREDDS, as well as the OSI SAF High Latitude web portal (http://osisaf.met.no).
The OSI SAF production should not be affected and the products will be available on EUMETCast as usual. We appologize for the inconveniences this might cause.
31.10.2014 - OSI SAF High Latitude FTP/HTTP server maintenance postponed
The maintenance in the data storage facilities at MET Norway on 1st November 2014 has been postponed, and hence there will be no outage of the OSI SAF High Latitude FTP and HTTP servers on 1st November. The maintenance will happen later in November, there will be an announcement about the date soon.
24.10.2014 - OSI SAF Sea Ice production back to nominal
The distribution of SSMIS data from NOAA through EUMETSAT is now confirmed to be back to nominal. The production of OSI SAF Sea Ice products is therefor also back to nominal. The production this morning produced products as expected, except for the LR Sea Ice Drift product (OSI-405). This product calculates drift from SSMIS data 48 hours apart. The first LR ice drift product will be available on the morning 26.10.2014.
23.10.2014 - Data stream to OSI SAF resumed
The data stream of SSMIS data from NOAA/EUMETSAT to OSI SAF has now resumed, and the daily OSI SAF sea ice products should therefore be back in nominal distribution tomorrow morning at about 04:45 UTC. The LR sea ice drift product will not be available for another two more days, as it relies on data from two consecutive days.
This interruption has not affected the MR sea ice drift product.
23.10.2014 - OSI SAF Sea Ice products still missing
The network problems at NOAA continues, and todays OSI SAF sea ice products are still missing due to this outage of SSMIS data. The necessary steps to resolve the issue has been taken at NOAA. No OSI SAF sea ice products will be available until this issue is resolved.
We are sorry for the inconvenience this data outage might cause. For more information,
contact us on email osisaf-manager
22.10.2014 - Still missing OSI SAF Sea Ice products
The network problems at NOAA continues, and we are still not receiving any SSMIS data. The OSI SAF sea ice products to be produced tomorrow morning (at about 04:30 UTC 23.10.2014) will therefor probably also be missing.
We are sorry for the inconvenience this data outage might cause.
22.10.2014 - Missing OSI SAF Sea Ice products
Due to a problem with the network at NOAA, we are not receiving SSMIS data for the production of the OSI SAF Sea Ice products (concentration OSI-401, edge OSI-402, type OSI-403, emissivity OSI-404 and LR drift OSI-405). Hence, the products from this morning (with time stamp 20141021) are missing. The data stream is yet not back to nominal, so we will be back with more news on this later today.
This problem do not affect the MR ice drift product (OSI-407), which is based on AVHRR data.
08.10.2014 - OSI SAF High Latitude FTP and web server unavailable on 01.11.2014
Due to a major maintenance in the data storage facilities at MET Norway on 1st November 2014, the OSI SAF High Latitude FTP, THREDDS and web server will be partly unavailable during this maintenance. The maintenance will last from 07 UTC to 17 UTC, and the services will at least be unavailable from 11 UTC to 13 UTC, probably longer.
This maintenance will affect availability of all OSI SAF Sea Ice products and the AHL SST, SSI and DLI product during this period through FTP and THREDDS, as well as the OSI SAF High Latitude web portal (http://osisaf.met.no).
The OSI SAF production should not be affected and the products will be available on EUMETCast as usual. We appologize for the inconveniences this might cause.
01.10.2014 - Degraded OSI SAF Sea Ice products
The OSI SAF sea ice concentration, edge, type, emissivity and drift products (OSI-401. 402, 403, 404 and 405) distributed today (labelled 20141001) have a small sector of missing data (from North Pole to the Kara Sea). This is due to problems with distribution of DMSP SSMIS data from NOAA. The data flow is now back to nominal.
The MR ice drift products was not affected by this outage.
30.06.2014 - Missing OSI SAF Sea Ice products
The OSI SAF sea ice concentration, edge, type and LR drift products were not produced and distributed as nominal on 28.06.2014, due to a software problem. The products have now been reprocessed (except LR ice drift) and are available on our FTP server ftp://osisaf.met.no/prod/ice
The Sea Ice Emissivity and MR ice drift products were not affected by this outage.
02.06.2014 - Missing OSI SAF Sea Ice products
The OSI SAF Sea Ice Concentration, Edge, Type, LR and MR Drift products from 20140601 were not produced and distributed as expected, due to an outage of the production server. The problem have been fixed, and production is back to nominal. The missing products were uploaded to the FTP server in delayed mode.
The Sea Ice Emissivity product was not affected by this outage.
23.05.2014 - Announcing two new sea ice products
The OSI SAF Sea Ice Team is happy to announce that the OSI SAF global sea ice emissivity and northern hemisphere medium resolution ice drift products (OSI-404 and OSI-407) are now available through EUMETCast and FTP, since 01.04.2014. On FTP, data is available both as NRT files and in the online archive. The sea ice emissivity product is in a pre-operational state, as it is still being validated.
More detailed information about the new releases is available here: http://osisaf.met.no/p/ice/new_ice_emis-mrdrift.html
13.05.2014 - Degraded OSI SAF AHL SST, SSI and DLI products
Due to problems with missing updates of TLE elements for geolocation of NOAA AVHRR data, the OSI SAF AHL SST, SSI and DLI products might be degraded or have reduced coverage. The METOP AVHRR data is not affected by this. We are working on getting updated TLE information, and will inform users when the situation is back to nominal.
12.05.2014 - Degraded OSI SAF sea ice products
The OSI SAF sea ice products from the last three days are degraded due to an internal disk problem at MET Norway. Some sectors in the ice products are missing data. The problem has now been resolved and the production is back to nominal.
02.04.2014 - Atlantic High Latitude SST and Flux missing METOP02 input
Due to problems with the local processing of METOP02 data at MET Norway
yesterday 2.April, the Atlantic High Latitude SST and Flux products from
2.April are based on NOAA satellites only. This has resulted in a bit less
coverage in the products.
26.03.2014 - Delayed OSI SAF AHL SSI product on FTP
Today's (dated 20140325) Atlantic High Latitude SSI product from OSI SAF was delayed due to
an internal error. The missing product has now been uploaded to the FTP
21.02.2014 - Degraded OSI SAF sea ice products
The sea ice products distributed today (with time stamp 20140220) have a large area/sector with missing data over Labrador Sea and Gulf of St Lawrence. The coverage is expected nominal in tomorrows product.
20.02.2014 - IJRS manuscript featuring OSISAF sea ice drift products
The OSISAF sea ice drift products (both Low- and Medium- Resolution) are compared against GPS buoy trajectories in the Arctic:
Byongjun Hwang, Inter-comparison of satellite sea ice motion with drifting buoy data, Int J of Rem Sens, Vol 34, Iss 24, 2013, Publisher
19.01.2014 - Changed status back to operational for sea ice product
The sea ice products previously labelled "pre-operational" have changed status back to "operational". The status of the sea ice products was degraded to "preoperational" in January 2013 due to the switch from SSM/I to SSMIS. The use of SSMIS has now been fully validated and reviewed, and the main conclusion is that the quality of the OSI SAF sea ice products with SSMIS is similar or better than with SSM/I. The validation results are presented in this report.
The products affected by this change are the sea ice concentration product (new identifier OSI-401-a), the sea ice edge product (new identifier OSI-402-a), the sea ice type product (new identifier OSI-403-a) and the LR sea ice drift product (new identifier OSI-405-a). The introduction of the "-a" in the product identifier is to indicated that there is a major change in the products. In this case, this change is the change from SSM/I to SSMIS.
The temporary distribution of two sets of products for comparison (one set based on SSM/I and one based on SSMIS) has now stopped. All distributed products are now based on SSMIS.
28.11.2013 - EUMETSAT firewall replacement on 30 November
On Saturday 30th November between 07:00 and 11:00 UTC, a EUMETSAT firewall is being replaced. During this time frame and possibly during the following 48 hours, there is an increased risk of outages of all OSI SAF sea ice products, as well as the AHL SST, SSI and DLI products delivered through EUMETCast. This will NOT influence the products on the OSI SAF FTP server.
16.11.2013 - Missing Southern Hemisphere sea ice products
The OSI SAF Southern Hemisphere sea ice concentration and sea ice edge products were not distributed to the OSI SAF FTP server as expected on 16th November (time stamp 15-11-2013), due to an internal mistake. The EUMETCast distribution was done as expected. The missing files have now been uploaded to the FTP server.
12.09.2013 - stop distribution of superseded SST and Flux products
As previously announced, the OSI SAF will now stop distribution of some superseded SST and Flux products to the OSI SAF Sea Ice FTP server ftp://osisaf.met.no. This change does not affect the products distributed through EUMETCast. The distribution will stop on 24th September 2013.
The affected products are the old 10km resolution High Latitude SST, SSI and DLI products
that have been replace by the 5km resolution Atlantic High Latitude products:
The current operational products are available at:
Please contact email@example.com if you have any questions.
11.09.2013 - stop distribution of superseded sea ice formats/products
As previously announced, the OSI SAF will now stop distribution of some superseded sea ice formats/products to the OSI SAF Sea Ice FTP server ftp://osisaf.met.no. This change does not affect the products distributed through EUMETCast. The distribution will stop on 24th September 2013. Below are listed the affected products:
Superseded HL products (all formats):
Superseded netcdf format (replaced by new format):
This last change is further explain at http://osisaf.met.no/p/ice/new_ice_netcdf_format.html
Please contact firstname.lastname@example.org if you have any questions.
14.08.2013 - Degraded OSI SAF sea ice products
The sea ice products distributed today (with time stamp 20130813) have a large area/sector with missing data. This is due to a SSMIS data outage at NOAA yesterday. The data stream from NOAA is back to nominal and tomorrows data product should have full coverage.
04.07.2013 - OSI SAF HL products back to nominal
The OSI SAF high latitudes products distribution on EUMETCast should now be back to nominal. This
includes Sea Ice, AHL SST and AHL Flux products. The distribution has been changed to bypass the
problem. This might cause that the product and quality flag files are distributed at slightly
25.06.2013 - Delays on high latitude products at EUMETCast
Due to connection problems to the EUMETCast upload server from Norway, we
still experience some occasional delays for the OSI SAF sea ice, AHL SST
and AHL Flux products through EUMETCast.
18.06.2013 - Delays on high latitude products at EUMETCast
We are experiencing delays in sending some of the sea ice products over
27.04.2013 - Delayed sea ice products
The OSI SAF sea ice products for 2013-04-26 were not distributed as usual on the morning of 2013-04-27, due to a production error. The files have been uploaded to the FTP server and can be collected as usual on:
17.04.2013 - Missing data in all sea ice products
Due to a technical problem at the common SSM/I and SSMIS processing center in the US, all our sea ice products with date 2013-04-16 show large areas of missing data. The issue is now fixed, data flow is resumed, and we expect tomorrow's sea ice products to have nominal coverage.
03.04.2013 - Missing OSI SAF sea ice products
During Easter there was a problem with the production of sea ice products at OSI SAF. No products were produced for the dates 24th and 25th March. Norminal production was resumed on the 26th.
The sea ice concentration, edge, type and drift products have been recovered, but based on SSM/I data instead of SSMIS data (no change in file structure or file naming). The sea ice drift products will not be reproduced. The missing products are now available on our ftp server in the usual directories (ftp://osisaf.met.no/prod/ice and ftp://osisaf.met.no/archive/ice). We are sorry for the inconveniences this data gap might have caused.
15.03.2013 - Problems with OSI SAF servers
The OSI SAF FTP server and web portal experienced problems just after midnight today. The upgrade yesterday seems not to be stable, and the servers have been reset to the old setup. The servers are now back on line.
14.03.2013 - Upgrading OSI SAF servers
The OSISAF high latitude FTP and web portal servers will be upgraded today at 1200 UTC. The services provided by these servers might be partly unavailable during the upgrade, which should take abort 30 minutes. This involves http://osisaf.met.no and ftp://osisaf.met.no.
If you have any problems after 1300 UTC, please report to us on email email@example.com.
07.03.2013 - SH LR Ice Drift available
The OSI SAF Low-Resolution Sea Ice Drift (LRSID) product (OSI-405) over the Southern Hemisphere (SH) is now ready for distribution. Disseminations started 7th March, both over EUMETCast and from our FTP server (ftp://osisaf.met.no). The SH files are available at the same directories as the Northern Hemisphere (NH) files, with the same file name convention. The only difference is that \"nh\" is replaced with \"sh\" in the file names.
Updated validation report and Product User Manual will shortly be made available in the Documentation section.
Note that due to atmosperic noise and surface melting, it is not possible to process reliable ice motion vector during (austral) summer. The availability period for the OSISAF SH LRSID product is accordingly from April 1st to October 31st.
21.02.2013 - Updated validation information after switch to SSMIS
Updated validation results for the sea ice concentration and sea ice edge products after the switch to SSMIS are now available at http://osisaf.met.no/validation/val_greenland.html. Select the "last quarter" plots. All the results after 19.02.2013 are based on SSMIS, while the results before are based on SSM/I.
21.02.2013 - Test products based on SSM/I available
For those users who are interested in looking closer on the difference
between sea ice products based on SSMIS and products based on SSM/I, we have made
available products based on SSM/I at this location:
01.02.2013 - Permanent switch to SSMIS
The OSI SAF has now decided that the switch from SSM/I to SSMIS as input to the operational sea ice products is made permanent. This means that all the OSI SAF sea ice products previously based on SSM/I data are now based on SSMIS.
The validation of the sea ice products based on SSMIS is not complete yet, so the status of the products are changed from operational to pre-operational. The products will be pre-operational until the full validation is reviewed later this spring. This will have no influence on the distribution of the products. The file names are also the same as before, so as user you should not see any change. The only change is that the metadata will be updated with correct satellite information and the pre-operational status.
More intermediate validation results will be presented here next week. Please contact us at firstname.lastname@example.org if you have any questions.
21.01.2013 - Use of SSMIS instead of SSMI in OSI SAF
As reported this weekend, the OSI SAF has switched to using SSMIS data instead of SSMI data for the operational sea ice products. This change affects the products dated 19-01-2013 and newer. This change was done because the SSMI data we receive are currently corrupted. We will continue to use SSMIS data until further notice. Some illustration of the impact of this change on the ice concentration product can be seen on this web site:http://osisaf.met.no/stories/sic_comparison_SSMIS_vs_SSMI An issue with reduced coverage over ice sheets in the Antarctic has been corrected, with effect from the products dated 21-01-2013. For any questions, please contact email@example.com.
19.01.2013 - SSMIS temporarily replaces SSMI
As the SSMI data received at OSI SAF are still corrupted, we have chosen to switch to SSMIS data for the operational OSI SAF sea ice products. The use of SSMIS data for sea ice production have been tested for some time, but is not yet fully validated. Still, the tests so far has shown that the difference between using SSMI and SSMIS has only a small impact on the products.
This change will impact in the products to be delivered 20-01-2013, that is with date stamp 19-01-2013.
19.01.2013 - Degraded OSI SAF sea ice products
The OSI SAF sea ice products produced this morning (dated 2013-01-18) are degraded due to corrupted input SSMI data. The data provider have been notified, but it is uncertain when the input data will be corrected.
10.01.2013 - Maintenance of OSI SAF HL servers
There are still some problems with the FTP and HTTP servers at the OSI SAF HL Center, osisaf.met.no. The servers will be down for maintenance for up to 30 minutes between 12:00 and 14:00 CET.
14.12.2012 - Network problems at OSI SAF High Latitude servers
Due to internal network problems at met.no, the OSI SAF FTP and web servers for
sea ice and high latitude SST and Flux products suffers from occasionally slower
connection and interruptions. It is uncertain when the cause of the problem will
be fixed. We are sorry for the inconvenience this might cause.
10.12.2012 - SST product unavailable on FTP
Due to network problems at met.no, the OSI SAF AHL SST product were not available
in time on the OSI SAF High Latitude FTP server on 8th and 9th December. The
products were available in time on EUMETCast.
28.11.2012 - Degraded OSI SAF sea ice products
Due to problems at NOAA ESPC some SSMI F15 orbits were not received by the OSI SAF. This data outage affected the OSI SAF products dated 26112012 and 27112012, where some areas are missing data.
The data stream is back to nominal now and the products that will be delivered tomorrow morning (dated 28112012) will have full coverage.
27.11.2012 - OSI SAF High Latitude servers unavailable
Due to network problems at met.no, the OSI SAF High Latitude FTP and HTTP
servers were unavailable a few hours this morning. This affected the availability
of OSI SAF Sea Ice products, AHL SST product and AHL Flux products through
FTP, as well as the OSI SAF HL web portal.
16.10.2012 - Maintenance of OSI SAF HL FTP and HTTP server
The OSI SAF High Latitude FTP and HTTP servers will have hardware maintenance on Thursday 18th October between 13:00 and 13:30 CET. The FTP server ftp://osisaf.met.no and HTTP server http://osisaf.met.no will be partly unavailable during this upgrade.
10.10.2012 - Uncompressing OSI SAF Sea Ice FTP archive
Parts of the OSI SAF FTP archive of sea ice products is currently compressed with gzip. The compressed files will be uncompressed on Tuesday 16th October. This is to make the files directly available in a THREDDS and WMS server.
The files in question are stored at this location:
26.09.2012 - OSI SAF sea ice extent graphs
The OSI SAF Sea Ice Team is happy to introduce daily updated sea ice extent graphs from the OSI SAF High Latitude web portal:
Both daily, seasonal and monthly graphs are available for the Northern Hemisphere sea ice extent. More information about the graphs are available on the web site.
14.06.2012 - Reduced coverage for AHL SST and Flux products
Due to technical problems with the AVHRR production servers at met.no, the AHL SST, DLI and SSI products for high latitudes had reduced coverage on 13th June. The problem was fixed during the evening and the production is now back to nominal.
24.05.2012 - Validation and Monitoring of Low Resolution Sea Ice Drift
The Low Resolution Sea Ice Drift product now has an online Validation and Monitoring page. It will regularly display updated validation results.
Access this new resource here.
Validation reports are available at any time from the Documentation section.
14.05.2012 - Upgraded NetCDF format for Sea Ice products
The NetCDF format of the OSI SAF Sea Ice Concentration, Edge and Type products (OSI-401, OSI-402 and OSI-403) have been upgraded, as well as the file name convention. The reprocessed Sea Ice Concentration product (OSI-409) and LR Sea Ice Drift (OSI-405) product have not been changed. The reason for these changes is to provide all ice products using the same meta data convention (CF-1.4) and to harmonize the content of these three products with the more recent released OSI-405 and OSI-409 products.
More detailed information about the upgrade is available here: http://osisaf.met.no/p/ice/new_ice_netcdf_format.html
To assure that the users have good time to adapt to the new format specifications, the old format will be provided in parallel with the new format until 15th September 2012.
23.04.2012 - OSI SAF Sea Ice: back to nominal
The OSI SAF sea ice production is now back to nominal and the sea ice concentration, edge and type products should be delivered as normal tomorrow morning at around 04:30 UTC (2012-04-24).
The missing products will be reprocessed and will be available on our FTP server (ftp://osisaf.met.no/prod).
23.04.2012 - OSI SAF Sea Ice: missing products
Due to an unexpected problem with the delivery of SSMI input data to the OSI SAF, we have not been able to produce any sea ice products since 21. April. The problem has been reported to the data provider, and we are hoping for a quick recovery.
If all goes well, we might be able to deliver ice concentration, edge and
type products as nominal tomorrow morning, 24-04-2012.
03.02.2012 - OSI SAF Sea Ice: partly missing input data
Due to outage of SSMI data from our data provider, yesterdays (produced
today) OSI SAF Sea Ice Concentration, Edge and Type products contain some
missing data areas.
02.01.2012 - Delayed sea ice products
Due to a problem with the distribution of products to our FTP server, the sea ice products were 3 hours delayed at the OSI SAF FTP server today. The distribution is now back to nominal.
15.12.2011 - Missing low resolution ice drift product
The low resolution sea ice drift production failed this morning. The production has been re-run and the latest product is now available through our FTP server as usual, ftp://osisaf.met.no/prod
13.12.2011 - SSM/I input data back to nominal
The SSM/I data stream from NOAA is now back to nominal, and data since 09UTC are available. The OSI SAF sea ice products might still experience missing data areas in the the product that will be distributed around 04 UTC tomorrow (14-12-2011).
13.12.2011 - Missing SSM/I input data
Due to a problem with the data flow of SSM/I data to NOAA, the OSI SAF
has not received SSM/I data since yesterday afternoon. This
results in missing orbits of input data to the sea ice concentration,
edge and type products and there are a few holes of missing data in
the products dated 12.12.2011.
12.12.2011 - Update for Sea Ice Concentration, Edge and Type
The NWP input data for the OSI SAF global sea ice concentration, edge and type products have been updated on 12-12-2011. These products now use the 0.25 degree resolution ECMWF NWP fields for the atmospheric correction that is applied to the brightness temperatures. Previously the 0.5 degree resolution fields were used. The update has a minor positive effect on the sea ice products.
07.12.2011 - New version of reprocessed sea ice concentration data set
The OSI SAF reprocessed sea ice concentration data set (OSI-409) has been updated and a new version v1.1 released. Two changes has been introduced to the new version of the data set:
28.10.2011 - EUMeTrain presents Ocean and Sea week training sessions
From 31 October to 3 November 2011 the EUMETSAT-sponsored training project EUMeTrain will host an event week on Ocean and Sea applications.
This EUMeTrain event week consists of several online sessions. The event week should serve as an exchange on the experience for the forecasting on shiproutes, but also advocate the benfits that the use of ASCAT data (Metop) as well as the radar altimetry data povided by Jason-2 can have to the operational maritime forecaster.
Registration for this event week is required. When you have registered you will automatically receive the required invitation. For those of you that will miss this event, all the sessions will be recorded for download.
EUMeTrain is EUMETSATs largest international training project which develops training material and the supports training in the field of satellite meteorology in combination with other meteorological data sources. EUMeTrains main goal is training and providing training material, supporting the EUMETSAT programs with special weight on hazardous weather events.
Further information on the event and the full timetable are available on the EUMeTrain website.
10.10.2011 - Delayed distribution on HL FTP
Due to a temporary failure of our FTP servers early Monday 10th Oct 2011, todays sea ice products (dated 20111009) were delayed on ftp://osisaf.met.no.
05.10.2011 - AMSR-E data outage
On October 4th 2011, the AMSR-E instrument stopped functionning due to a problem with the antenna rotation.
08.08.2011 - Missing data in sea ice product dated 06.08.2011
Missing SSM/I data caused missing sea ice concentration coverage over the Beaufort Sea and
Canadian Arctic Archipelago in the NH product with timestamp 06-08-2011 12 utc, and over
Cosmonaut Sea in the SH product with same timestamp.
18.05.2011 - ASCAT data nominal
The distribution of ASCAT data was back to nominal on 16. May at 10:51 (after a data outage since 14. May). The sea ice edge and type products for 16. May therefore had partial coverage of ASCAT data. The product for 17. May had normal coverage.
15.05.2011 - Missing ASCAT data
Due to missing ASCAT data since 14. May, the OSI SAF sea ice edge and sea ice type products are
currently produced without the expected ASCAT input. These two multi sensor sea ice products are
therefore delivered based on SSM/I alone, and the missing ASCAT input may lead to reduced quality.
03.05.2011 - Maintenance on Sea Ice FTP and HTTP servers
The OSI SAF Sea Ice FTP and HTTP servers will be moved to a new building on 5 May 2011 at 17:00 UTC.
02.05.2011 - Updated Product Documentation
Two pieces of product documentation were newly updated in the
16.03.2011 - Uncertainties in the Sea Ice Concentration Reprocessing data set
A problem has been uncovered with the algorithm used for calculating the errors[uncertainties]
in the reprocessed OSI SAF ice concentration dataset.
Initial investigations show this problem leads to errors [erroneous uncertainties] being
reported higher than supposed to for all concentration ranges.
22.02.2011 - Delayed AMSR-E ice drift product (OSI-405)
Due to a processing error, today's OSI-405 AMSR-E ice drift product (motion from 19th to 21st Februar)
was not delivered at schedulded time. Both the ASCAT, SSM/I and MULTI-OI OSI-405 ice drift products
were processed and distributed according to schedule.
16.02.2011 - Missing input data
Due to a data outage of SSM/I F-15 data from NOAA/FNMOC during several hours yesterday, the latest OSI SAF Sea Ice products (dated 15.02.2011) have missing data in a sector from 20W to 80W. The data distribution from NOAA is back to nominal and the next sea ice products should be normal.
09.02.2011 - New HTTP and FTP servers
As announced earlier, a new ftp and http server
for the OSI SAF sea ice products will be
replacing the old server tomorrow morning 10th February 2011. This switch
should not affect the users, but in case of problems, please contact us on
19.10.2010 - HL Sea Ice products removed from EUMETCast
The sea ice products covering the limited HL area will be removed from
EUMETCast distribution on 15 November 2010. The HL sea ice products are
superseded by the global sea ice products, as the HL area is fully
covered by the NH products.
14.10.2010 - Sea ice motion paper published in JGR Oceans
An article introducing the Continuous Maximum Cross-Correlation (CMCC) method and its validation
in the Arctic was published in the Journal of Geophysical Research - Oceans.
04.10.2010 - Sea ice drift: start of 2010-2011 season
The processing and dissemination of sea ice drift vectors from low-resolution imaging sensors (OSI-405) was succesfully
resumed today 4 October 2010. As planned, the first product grid to be disseminated corresponds to
drift vectors from 1 October to 3 October. During Arctic summer, atmospheric noise and surface melting prevent
the unambiguous retrieval of sea ice motion vectors from the sensors and channels we use. Accordingly,
no sea ice motion vectors are distributed from 1 May to 30 September.
28.09.2010 - Two reports on the validation of ice drift products
Two new reports dealing with validation of the sea ice drift products are available from
the documentation section:
24.08.2010 - Delayed distribution
The OSI SAF Sea Ice products that was supposed to be distributed at 24.08.2010 around 04:30UTC, with timestap 20100823, have been delayed due to failure on the operational processing machine. The delayed files have now bin distributed to our ftp server, ftp://osisaf.met.no/prod/ice, where they can be downloaded.
09.08.2010 - Start migrating to new url http://osisaf.met.no
The OSI SAF High Latitude (Sea Ice, SST and Flux) web portal will gradually migrate from http://osisaf.met.no to
http://osisaf.met.no. While both websites are currently kept synchronized,
users are invited to readily update their bookmarks and start visiting us at the new URL.
20.05.2010 - NetCDF products on mersea.met.no server moved to osisaf.met.no
The OSI SAF Sea Ice Concentration, Edge and Type products on NetCDF format previously available on the FTP server ftp://mersea.met.no/mersea/seaice have now been moved to a new server: ftp://osisaf.met.no/prod_netcdf/ice. The old FTP server will be closed down 24. May 2010. We therefore ask our users to start using the new server as soon as possible.
The Opendap server at mersea.met.no has been replaced with a Thredds server available at http://osisaf.met.no/thredds/catalog/osisaf/met.no/prod_netcdf/catalog.html.
This change do not affect the Sea Ice Drift products on NetCDF format or the Concentration, Edge and Type files on GRIB and HDF5 format.
08.04.2010 - Sea Ice Drift product available through EUMETCast
The OSI SAF Low Resolution Sea Ice Drift (LRSID) product is now available through EUMETCast (starting from today),
together with the other OSI SAF sea ice products.
15.03.2010 - Updated validation report is available for the sea ice drift product
A new version of the validation and monitoring report for the Low Resolution Sea Ice Drift product of
the OSI SAF is available from the documentation section of this
03.02.2010 - Observing sea ice in the Skagerrak and Oslo fjord
Exceptional sea ice conditions in the Skagerrak Strait (between Norway, Sweden and Denmark) and Oslo fjord are
monitored with a new algorithm using the Advanced Very High Resolution Radiometer (AVHRR) instrument.
15.01.2010 - Quicklooks for Low Resolution Sea Ice Drift product now available
Daily images of the Low Resolution Sea Ice Drift product are now available from the quicklooks page.
For the time being, they are limited to the merged (multi sensor) product, from December 2009 onwards, zoomed over the Arctic Ocean.
We are currently working on extending the time series.
16.12.2009 - Distribution of test products: planned termination
Since the updated sea ice edge and type products as well as the new sea ice drift datasets are now distributed from the main FTP directories for sea ice products, their distribution to the ftp://osisaf.met.no/testprod directory will be terminated next Monday (21st December).
16.12.2009 - RSS feed (beta)
A RSS feed mechanism was activated from the OSISAF HL website for easing access to our local News items. Interested
users are invited to syndicate to this flux with their preferred reader. This functionality is still in a beta stage and
was not yet fully tested on all possible news reader nor web browser. Do not hesitate to contact Webmaster for reporting
malfunction or missing features.
15.12.2009 - Upgrade of the processing chain
On December, 9th 2009, the OSI SAF HL processing chain was upgraded from version 3.2 to version 4.0. This upgrade was mainly concerned with the updated sea ice edge and sea ice type products and the introduction of the new low resolution sea ice drift product. The ice concentration production chain was not modified.
02.12.2009 - Change in the ftp architecture for sea ice drift products
For easier maintenance and enhanced readibility, the directory architecture for the sea ice drift
datasets is modified at the High Latitude FTP server.
30.11.2009 - DMSP F-13 SSM/I data no longer available
The DMSP F-13 SSM/I data are no longer available, due to failure of the last tape recorder. There is therefore
only one available satellite with SSM/I data, DMSP F-15. The OSI SAF Sea Ice products are therefore currently
based on data from this satellite only.
24.11.2009 - Announcing new Sea Ice Drift product
A new sea ice drift product is being made available from the OSI SAF production chain. Sea ice motion
datasets are processed everyday from pairs of images acquired by passive and active microwave sensors
(AMSR-E, SSM/I, ASCAT). The time-span of the displacement vectors is 48 hours and grid resolution is
62.5 km. For the time being, only the Northern Hemisphere region is processed and production is therefore
pre-operational. Data dissemination is expected to begin on December, 8th 2009. More information about the
product, data access, algorithms and validation can be found at:
19.11.2009 - Announcing updates in Sea Ice Edge and Sea Ice Type products
New, improved OSI SAF Sea Ice Edge and Sea Ice Type products are almost ready for distribution.
The plan is to replace the existing products with the new products on 8. December 2009. This upgrade
do not affect the format or filename of the products. Until the upgrade both the old and new product
will be available on our FTP server. More details about this and documentation of the improvements
are available on this web page:
15.10.2009 - Change in Sea Ice products
Due to problems with the recorders on-board DMSP F13 and F15, parts of the SSMI orbits are lost during recorder dumps. This affects the OSI SAF Sea Ice Northern Hemisphere products. To ensure complete data coverage, the OSI SAF Sea Ice team has chosen to increase the period of input data used in the daily sea ice analysis. The latest 32hours of SSMI data are now used, instead of the latest 24 hours. This solution will be used until the second recorder on-board F15 is working again. The OSI SAF Sea Ice team is also working on implementing the use of SSMIS instead of SSMI.
The OSI SAF Sea Ice products processed approx. 2009-10-14 04:15UTC, with timestamp 2009-10-13 12:00UTC were degraded in the form of a stripe of missing data covering the European sector (Fram Strait and Svalbard). This was caused by degraded and/or missing SSM/I data.
The OSI SAF Sea Ice products processed approx. 2009-03-11 04:15UTC, with timestamp 2009-03-10 12:00UTC contained noise in the form of false lower ice concentration around Greenland. This was caused by degraded SSM/I data. The degraded data have been removed and the sea ice products reprocessed. These corrected products are now available on our anonymous FTP server, ftp://osisaf.met.no/prod/ice.
NSIDC (National Snow and Ice Data Center) has reported that the 22 GHz channels on the SSM/I instrument onboard the DMSP F15 is drifting. This may affect the filtering of weather system induced noise in the processing of sea ice products. However, the production of sea ice products at the OSI SAF uses NWP data to correct the SSM/I brightness temperatures. This reduces the noise from weather systems significantly. Therefore OSI SAF sea ice products are at present insignificantly affected by this sensor drift. Anyway, the OSI SAF team is currently preparing for replacing the SSMI F15 data with SSMIS F16 data.
All ice products with time stamp 06/11/2008 were delayed on the OSISAF ftp servers. They are now available (11:00 utc). Distribution via EUMETCast was not affected.
The daily OSI SAF Sea Ice products have previously been distributed twice daily by mistake at about 04.20 and 05.10 UTC. The distribution has now been changed and the daily sea ice products are now distributed once at about 04.20 UTC.
The OSI SAF Sea Ice products producted approx. 2008-09-19 04:15UTC, with timestamp 2008-09-18 12:00UTC contained noise in the form off false ice around Svalbard. This was caused by degraded SSM/I data. The degraded data have been removed and the sea ice products reproduced. These updated products are now available on our anonymous FTP server, ftp://osisaf.met.no/prod/ice.
The OSI SAF Sea Ice products producted approx. 2008-08-03 04:15UTC, with timestamp 2008-08-02 12:00UTC were not produced because of a machine overload at met.no. Therefor the products were not available on EUMETCast. The products are now available on the FTP server, ftp://osisaf.met.no/prod/ice.
The production is now nominal.
15.07.2008 - Delayed SST HL 12H product
Due to a failure in the operation production system (Monday 14th July, approx. 16:00 UTC to approx. 22:00 UTC), the 12 Hourly SST 'High Latitude' products with time stamp 2008-07-14:19h15utc was not delivered.
The systems are now back to nominal status and production has resumed as of 2008-07-15:07h15utc.
24.04.2008 - Planned power outage
Due to construction work related to the power supply at METNO, the OSI SAF ftp server and web portal for sea ice products may be inaccessible in periods on April 26 and 27, 2008.
27.03.2008 - Errors in NH Sea Ice products
Yesterdays (26.03.2008) OSI SAF Sea Ice products for the Northern Hemisphere (producted this morning) contains errors east of Greenland because of positioning error in the SSMI data. The errouneous input data have been removed and the products regenerated. The improved products are available through our anonymous ftp server:osisaf.met.no under:
We are sorry for the inconvenience this might have caused.
28.02.2008 - Delayed Sea Ice products
The OSI SAF Sea Ice products were delayed today because of an internal error in the OSI SAF production system. The error has been fixed. Because of this, the sea ice products were not available on EUMETCast. But the products are available through our anonymous ftp server, ftp://osisaf.met.no under prod/ice. We are sorry for the inconvenience this might have caused.
14.02.2008 - New coefficients for HL SST algorithms
The SST algorithms for NOAA-17 and NOAA-18 for the High Latitude SST product has been upgraded. Validation results showed a negative bias for both satellites. This negative bias was improved by introducing the algorithm coefficients used for the NAR product. The change was effective starting with the 12 hourly HL SST product centered at 1200UTC 14.02.2008, produced at 18UTC.
13.12.2007 - AMSR-E data are back
The AMSR-E data stream is up and working again, and the OSI SAF Sea Ice Concentration products are again available.
04.12.2007 - Missing AMSR-E data
The OSI SAF Sea Ice demonstration product based on AMSR-E data is currently missing. The AMSR-E data are missing from NASA because of a data processing failure. The AMSR-E data stream should be up again by Thursday or Friday this week.
30.11.2007 - EUMETCast dissemination nominal again
The OSI SAF Sea Ice products distribution over EUMETCast was back to nominal this morning and all products available.
29.11.2007 - Sea Ice products missing on EUMETCast
The OSI SAF Sea Ice products where not distributed over EUMETCast this morning because of problems with the EUMETCast dissemination (channel 3). The problems are being investigated at EUMETSAT and will hopefully be solved soon. The Sea Ice products are also available through FTP at ftp://osisaf.met.no/prod.
23.09.2007 - New test product available
A new sea ice concentration test product based on AMSR-E is available. The OSI SAF team has implemented an algorithm for processing AMSR-E data for sea ice concentration, similar to the SSM/I based product. The products are available at the download page.
14.09.2007 - New quality monitoring tool
A new tool for browsing the daily and monthly sea ice products quality monitoring images is available at the validation pages. These quality monitoring images are the result of the daily manual inspection of the sea ice products performed by the ice analyst on duty at the DMI Ice Service. These images will tell the users if there are any anomalies in the products caused by misclassification, lack of input data etc. The images can be browsed one at the time, or two at the same time for comparison. An archive of these images are available back to September 2006.
During Arctic summer season (May-September) the ice type product is dubious because melting of the ice surface obscures the ice type signals. We therefor advice our users not to use the northern hemisphere ice type product in this period. Regarding the southern hemisphere ice type product there is almost no multi year sea ice present throughout the year at all.
The Southern Hemisphere sea ice products have now been declared operational by the OSI SAF Steering Group. The SH products are now distributed throught EUMETCast in trial mode until 11. April when they will be operationally available also through EUMETCast. The SH products are now also available in the ftp archive (back to 01.01.2007), under ftp://osisaf.met.no/archive/ice.
Yesterdays OSI SAF Sea Ice products are degraded because of missing SSMI data. There is a problem with the SSMI data stream from UKMO/NESDIS. The data stream is now up again and todays product (available tomorrow morning) should be okay.
The OSI SAF Sea Ice products were not received over EUMETCast this morning because of a bandwidth problem at the EUMETCast uplink server. The problem was fixed this afternoon.
At the status page on 07.12.2006 it is indicated that the OSI SAF Ice products were not received over EumetCAST. This is only the case locally at met.no, due to a hardware failure on the EumetCAST receiving system.
The OSISAF processing chain will be upgraded 22 May.
Upgrade of DLI processing, NWP handling modified.
The OSISAF processing chain will be upgraded in week 21. This implies an upgrade of the NCSA HDF5 library used to generate the OSISAF HDF5 files. Previously HDF5-1.4.4 was used, with the new software this will be changed to HDF5-1.6.4. users of the HDF5 files should be aware of this.
More information on the algorithm consequences will be provided later.
The NOAA AVHRR local reception at met.no failed yesterday because of an error with the TBUS messages. Because of this the high latitude OSI SAF SST products that were delivered from met.no yesterday evening and this morning were empty or missing. This affected these products:
SST12HL_200602261200.grb (only missing data)
The error in the local reception has been fixed and the production is now running as normal.
The NOAA AVHRR local reception at met.no failed yesterday. Because of this the high latitude OSI SAF SST products that were delivered from met.no yesterday evening and this morning were empty or missing. This affected these products:
The error in the local reception has been fixed and the production is now running as normal.
The Northern Hemisphere (NH) Sea Ice products for sea ice edge, concentration and type are
now available throught the EUMETCast service on GRIB format, in addition to the HL products.
The file names for these products have the form
S-OSI_-NOR_-MULT-GL_NH_CONC__-200602131200Z.grb. More information about these files can be
found in the Product Manual for Sea Ice products available under Documentation.
A new test product is now available. This is an improved sea ice type product where SSM/I and Seawind Quikscat data are combined in a multi sensor analysis. The current operational sea ice type product only use SSM/I. The test products are available under Products/Download. Documentation about the new test products is available under Documentation.
The OSI SAF High Latitude web pages have been upgraded. The design have been changed to better resemble the main OSI SAF pages. A new page with production status have also been added. So far only for sea ice. Flux and sst will be added.
The problem with the Internet connection have been repaired. The distribution of Sea Ice products through EUMETCast is back to nominal.
The Northern Hemisphere Sea Ice product has been reviewed by EUMETSAT and is close to be declared for operational. It will then be disseminated through EUMETCast together with the HL product. This dissemination is expected to start in December 2005.
A new updated version of the Sea Ice Product Manual (v3.2) is available. See under Documents.
The problem with the Internet connection between OSI SAF/met.no and EUMETSAT have been identified and will be repaired. In the mean time a backup distribution has been established and the OSI SAF Sea Ice products are now available again over EUMETCast. The products might be a bit delayed compared to usual dissemination.
There is a problem in the FTP-connection between OSI SAF/met.no and EUMETSAT. The Sea Ice products are therefore not available over EUMETCast (since 16.10.2005). We are investigating the problem. The Sea Ice products are available at the OSI SAF Sea Ice FTP-server.
Some changes on the web-pages, mainly design and added some information.
The was a cut in the SSM/I data stream from UK Met.Office which caused some areas with missing
data in the OSI SAF Sea Ice products from 04.09.2005. The data stream is now working as usual
Sea Ice products for the Southern Hemisphere (SH) are now available at the ftp-server
ftp://osisaf.met.no/prod, together with the Northern Hemisphere (NH) and northern Atlantic (HL/multi)
The was an anomaly in the SSM/I data stream from ECMWF which caused large areas with missing data in the OSI SAF Sea Ice products from 21.06.2005. The error has been corrected and the products from 21.06.2005 have been reproduced. The data products at the ftp-servers have been replaced.
The Flux products were not processed last night due to a forced server reboot, the problem is being investigated.
OSI SAF ice concentration and SST products are from today used daily
in the HIRLAM20 model. SST fields are updated at 00 ad 12 UTC from the MAP (Merged
Atlantic Product) product. Ice concentration fields are updated from O&SI
SAF ice products at 12 UTC daily.
No SST product today caused by problems with AVHRR data retrieval.
The OSI SAF High Latitude software was upgraded to version 3.1 on 28.03.2005. The upgrade includes:
The OSI SAF chain running at met.no has been upgraded to version 3.0 on 09.06.2004. The upgrade includes:
The NOAA-16 satellite is now removed from the SST-processing because of malfunctioning AVHRR instrument.
From 13.04.2004 SSM/I data is decoded north of 40 degrees, instead of 50 degrees. Leading to a larger coverage in the ice product.
The production of products was stopped saturday 20.03.2004 due to an error. It is now fixed and should be working again
Flux products are now available for download. Quicklooks will soon be available.
The software is updated, to version 2.0, and now running on Linux
The documentation page is updated and new scientific and technical documents are available.
The documentation page is updated and new documents available.
The problems concerning quicklooks of sea ice products are fixed so updated products should be available from now on.
Quicklooks of the sea ice products have not been generated for some days due to a processing problem. The problem is identified and will probably be fixed within this week.
Added link page.
The High Latitude Ocean and Sea Ice SAF website has been redesigned and products are made available both in full resolution HDF5 and GRIB files, as well as in a quicklook archive set up with JPEG imagery in thumbnail and full format.