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Sea Ice Products

Near-Real-Time Sea Ice Products

OPERATIONAL Global Sea Ice Concentration
TitleOSI-401-b: SSMIS Sea Ice Concentration Maps on 10 km Polar Stereographic Grid
DescriptionThe sea ice concentration product from the EUMETSAT OSI SAF. Ice concentration is computed from atmospherically corrected SSMIS brightness temperatures, using a combination of state-of-the-art algorithms. It is operational since 2005.
Data usedSSMIS (DMSP F18), ECMWF forecast for atmospheric correction (SSM/I before 19-01-2013)
FormatsHDF5, NetCDF, GRIB
NRT accessFTP (last 31 days in NetCDF3, HDF5 and GRIB) and EUMETCast (GRIB).
ArchiveFTP (since 2005) and EUMETSAT Data Center
DocumentationProduct User's Manual
LinksQuicklooks NH, Quicklooks SH, Validation & monitoring
RemarksThis product shall be referred to as: Sea ice concentration product of the EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSI SAF, www.osi-saf.org).
OPERATIONAL Global Sea Ice Edges
TitleOSI-402-b: Sea Ice Edge Maps on 10 km Polar Stereographic Grid
DescriptionThe sea ice edge product from the EUMETSAT OSI SAF. Ice classes are assigned from atmospherically corrected SSMIS brightness temperatures and ASCAT backscatter values, using a Bayesian approach. It is operational since 2005.
Data usedSSMIS (DMSP F18), ASCAT (Metop-A), ECMWF forecast for atmospheric correction.
FormatsNetCDF, GRIB, HDF5
NRT accessFTP (last 31 days in NetCDF3, HDF5 and GRIB) and EUMETCast (GRIB).
ArchiveFTP (since 2005), THREDDS (only NetCDF3) and EUMETSAT Data Center
DocumentationProduct User's Manual, Validation Report, ATBD
LinksQuicklooks NH, Quicklooks SH, Validation & monitoring
Remarks
  • This product shall be referred to as: Sea ice edge product of the EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSI SAF, www.osi-saf.org).
OPERATIONAL Global Sea Ice Types
TitleOSI-403-b: Sea Ice Type Maps on 10 km Polar Stereographic Grid
DescriptionThe sea ice type product from the EUMETSAT OSI SAF. Ice classes are assigned from atmospherically corrected SSMIS brightness temperatures and ASCAT backscatter values, using a Bayesian approach. It is operational since 2005.
Data usedSSMIS (DMSP F18), ASCAT (Metop-A), ECMWF forecast for atmospheric correction
FormatsNetCDF, GRIB, HDF5
NRT accessFTP (last 31 days in NetCDF3, HDF5 and GRIB) and EUMETCast (GRIB).
ArchiveFTP (since 2005), THREDDS (only NetCDF3) and EUMETSAT Data Center
DocumentationProduct User's Manual, Validation Report, ATBD
LinksQuicklooks NH, Quicklooks SH, Validation & monitoring
Remarks
  • Note, that during Arctic summer season (May-September) the ice type product is dubious because melting of the ice surface obscures the ice type signals. Similarly for SH, at present no ice type classification has been defined and SH product files do not contain valid classification.
  • This product shall be referred to as: Sea ice type product of the EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSI SAF, www.osi-saf.org).
PRE-OPERATIONAL Sea Ice Emissivity
TitleOSI-404: The near 50GHz global sea ice emissivity
Description The sea ice surface emissivity is representative for the near 50 GHz channels used for temperature sounding of the atmosphere using satellite radiometers such as SSMIS and AMSU.
Data usedSSMIS brightness temperatures at 19v, 37v and 37h
FormatsNetCDF
NRT accessFTP (last 31 days in NetCDF)
ArchiveFTP
DocumentationProduct User's Manual, Validation Report, ATBD
LinksQuicklooks NH,Quicklooks SH
Remarks
  • The emissivity is combined with the surface effective temperature, sometimes called the skin temperature, in the radiative transfer equation. Model simulations indicate that the snow-ice interface temperature or alternatively the 6 GHz brightness temperature is a closer proxy for the 50 GHz effective temperature than the snow surface or air temperature
  • This product shall be referred to as the near 50GHz sea ice emissivity product of the EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSI SAF, www.osi-saf.org).
OPERATIONAL Low Resolution Sea Ice Drift

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TitleOSI-405-b: Sea Ice Motion Maps with 48 hours span, on 62.5 km Polar Stereographic Grid
DescriptionThe low resolution sea ice drift product from the EUMETSAT OSI SAF. Ice motion vectors with a time span of 48 hours are estimated by an advanced cross-correlation method (the Continuous MCC, CMCC) on pairs of satellite images. Several single-sensor products are available, along with a merged (multi-sensor) dataset.
Data usedSSMIS (91 GHz, DMSP F17), ASCAT (Metop-A), AMSR-2 (36.4 GHz, GCOM-W1)
FormatsNetCDF3
NRT accessFTP (last 31 days in NetCDF)
ArchiveFTP (since December 2009), HTTP and OPENDAP (from October 2006 to December 2009)
DocumentationProduct User's Manual, Validation Report
LinksQuicklooks NH, Quicklooks SH, Validation and Monitoring
Remarks
  • Due to high atmospheric Liquid Water Content and to ice surface melting, it is not possible to track ice motion during Arctic summer, from the channels we are processing. Accordingly, the NH product files distributed between 30th April and 1st October do not contain any valid vector. Similar, the SH product files distributed between 31st October and 1st April do not contain any valid vector.
  • The next version of the product (OSI-405-c) is now available with DEMONSTRATION status. Please have a look here.
Operational Medium Resolution Sea Ice Drift

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TitleOSI-407: Sea Ice Motion Maps with 24 hours span, on 20.0 km Polar Stereographic Grid
DescriptionThe Medium resolution sea ice drift product from the EUMETSAT OSI SAF. Ice motion vectors with a time span of 24 hours are estimated by a maximum cross-correlation method (MCC) on pairs of satellite images. Input data are ~1km Infra Red or Visible data from the AVHRR instrument on board the METOP satellite.
Data usedAVHRR channel 2 and channel 4 (Metop-A VIS and TIR respectively)
FormatsNetCDF
NRT accessFTP (last 31 days in NetCDF)
ArchiveFTP
DocumentationProduct User's Manual, Validation Report
LinksQuicklooks NH
Remarks
  • Due to pronounced cloud cover during summer, and occasional during winter periods, the daily data coverage can be very sparse.
  • The mr ice drift production is based on TIR data during winter and VIS data during summer, with an overlapping period in spring and autumn.
DEMONSTRATION Low Resolution Sea Ice Drift (Demonstration)

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TitleOSI-405-c: Sea Ice Motion Maps with 48 hours span, on 62.5 km Polar Stereographic Grid
DescriptionNext version of OSI-405-b product (see above), but with ice drift vectors in summer, and maps of uncertainties. This is a DEMONSTRATION product, not to be used for OPERATIONAL applications
Data usedSSMIS (91 GHz, DMSP F18), ASCAT (Metop-B), AMSR-2 (18.7 and 36.5 GHz, GCOM-W1)
FormatsNetCDF3
NRT accessFTP (since 2016/06/15)
ArchiveFTP (2013/01/01 to 2016/06/15)
DocumentationATBD
Links Quicklooks NH, Quicklooks SH
Remarks
  • Note that the sea ice drift vectors during summer (May-September in NH, November-May in SH) are 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).
  • This product is released on a DEMONSTRATION basis to interested beta-users. We welcome feedback. The DEMONSTRATION status is used for products that have finalized their algorithm baselines, but for which operational implementation is not complete, nor fully validated. Changes in the DEMONSTRATION products may happen at short or no notice. The current operational product is OSI-405-b

Sea Ice Products for Climate Monitoring

REPROC DATASET Global Sea Ice Concentration reprocessing dataset (1978-2015)
TitleOSI-409-a: Global Sea Ice Concentration reprocessing dataset (1978-2015)
DescriptionThe reprocessed sea ice concentration dataset of the EUMETSAT OSI SAF, covering the period from October 1978 to 15th April 2015 using passive microwave data (PMW) from the SMMR, SSM/I and SSMIS sensors. Ice concentration is computed from atmospherically corrected PMW brightness temperatures, using a combination of state-of-the-art algorithms and dynamic tie-points. The dataset includes error-bars for each grid cell (uncertainties). Version 1.1 covered the period Oct 1978-Oct 2009 (labelled OSI-409) and version 1.2 was extened with the period Oct 2009-Apr 2015 (labelled OSI-409-a).
Data usedSMMR, SSM/I and SSMIS, ECMWF re-analysis and forecast for atmospheric correction
FormatsNetCDF
Access DataFTP (whole dataset)
DocumentationProduct User's Manual, Validation report
LinksQuicklooks (single day), Quicklooks (compare 2 days)
Remarks

Use of this dataset should be acknowledged by referring to:
EUMETSAT Ocean and Sea Ice Satelitte Application Facility. Global sea ice concentration reprocessing dataset 1978-2015 (v1.2, 2015), [Online]. Norwegian and Danish Meteorological Institutes. Available from http://osisaf.met.no.

Offline Product Global Sea Ice Concentration continuous reprocessing offline product (2015-)
TitleOSI-430: Global Sea Ice Concentration continuous reprocessing offline product (2015-)
DescriptionThe continuous reprocessed sea ice concentration offline product of the EUMETSAT OSI SAF, covers the period from 16th April 2015 onwards using passive microwave data (PMW) SSMIS sensors. This product has been set up to continue the OSI-409-a product, with a monthly daily (33 days). Ice concentration is computed from atmospherically corrected PMW brightness temperatures, using a combination of state-of-the-art algorithms and dynamic tie-points. The product includes error-bars for each grid cell (uncertainties).
Data usedSSMIS, ECMWF re-analysis and forecast for atmospheric correction
FormatsNetCDF
Access DataFTP (whole dataset)
DocumentationProduct User's Manual, Validation report
LinksQuicklooks (single day), Quicklooks (compare 2 days)
Remarks

Use of this product should be acknowledged by referring to:
EUMETSAT Ocean and Sea Ice Satelitte Application Facility. Global sea ice concentration continuous reprocessing offline product (year), [Online]. Norwegian and Danish Meteorological Institutes. Available from http://osisaf.met.no.

Contact

Contact person for OSI SAF Sea Ice products is Steinar Eastwood, met.no, osisaf-manager[at]met.no.

   
       
     

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