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Sea Ice Edge (OSI-402) and Sea Ice Type (OSI-403)

In the context of the first Continuous Development and Operation Phase (CDOP-1), the products of sea ice edge and sea ice type were introduced in the Ocean and Sea Ice SAF product's portofolio. It is based on the low resolution Passive and Active Microwave instruments of SSMIS and ASCAT, respectively, with potential to include other corresponding instruments like AMSR2, etc...

The products of edge and type are gridded datasets. They are provided on a Polar Stereographic Grid where the grid-point spacing is 10 km similar to the one used for the other OSI SAF sea ice products.

  1. Introduction and FAQ
  2. Algorithms
  3. Validation
  4. Documentation and links
  5. References

1. Introduction and FAQ

How should I cite this dataset?

The edge dataset shall be referred to as the Sea ice edge product of the EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSI SAF, www.osi-saf.org).
The type dataset shall be referred to as the Sea ice type product of the EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSI SAF, www.osi-saf.org).

Which satellite sensors are processed?

The sensors and channels used for these products are SSMIS (19h, 19v, 37v, 91h, 91v) on board DMSP platform F18, and ASCAT (C-band backscatter) on board EUMETSAT platform Metop-A.

What is the spatial grid resolution of this product?

The products of sea ice edge and type are gridded datasets. The grid resolution has 10 km spacing on a Polar Stereographic projection mapping. Definitions for the projection parameters can be found in the NetCDF files as well as in the Product User's Manual.

What is the time-span of this product?

One day (24 hours).

What is the difference between sea ice edge and sea ice type products?

Both the sea ice edge product and the sea ice type product are classification products differing between different ice classes. Sea ice edge differs between the classes open water, open ice, and closed ice which are defined from the ice concentration thresholds of 30 proc. and 70 proc., respectively. Sea ice type differs between First-year ice and Multiyear ice which are defined from target regions of known ice types...

Today's product file is empty, what happened?

Two possible answers:

  • Missing input data: In case of interrupted data link with the satellite operating centres, no input swath data are available for processing of the sea ice data, resulting in an empty grid.
  • Ambiguous data: Due to atmospheric noise and surface melting, it is not possible to do ice type classification during the melt season with the sensors/channels we process. Empty product files are distributed from 16th of May to 30th September in the NH grid for not interrupting the data flow to operational centres. For the SH grid, at present to ice type classification has been developed.
In both cases, the status_flag dataset in the product file indicates the reasons for missing data.

What is the legend used for the quicklooks?

Quicklooks for both products can be viewed from this page (NH, SH).

Colour codes

ColourSea Ice Edge
landOperational Sea Ice Edge product
open water ...
unclassified (coastal areas) ...
open ice ...
closed ice ...
ColourSea Ice Type
landOperational Sea Ice Type product
open water ...
unclassified (coastal areas) ...
first-year ice ...
multiyear ice ...
ambiguous. ...

Do you have a similar ice type product for Antarctic regions?

No. At present ice type classification has not been defined in the OSI SAF algorithms.

I do not fancy NetCDF, do you have other formats?

The processing chain is currently producing GRIB and HDF in addition to NetCDF files. However, both GRIB and HDF will be faced out in near future. NetCDF will stay. Please let us know (contact) if you need another format.

3. Validation

Validation of the OSI SAF sea ice products can be found in the product specific validation report, also referred to in Documentation and links.

4. Documentation and links

The following documentation is available, further describing the operational products of OSI-402 sea ice edge and OSI-403 sea ice type.
Quicklooks for both products can be accessed from these pages: (NH, SH).
Data can be accessed from FTP:

5. References

5.1 Peer-reviewed articles

[1] Breivik, L.-A., S. Eastwood and T. Lavergne (2012), Use of C-Band Scatterometer for Sea Ice Edge Identification. Geoscience and Remote Sensing, IEEE Transactions, vol.50, no.7, pp.2669-2677.

5.2 Reports, proceedings, etc...

[1] Aaboe, S., L.-A. Breivik, A. Sorensen, S. Eastwood, and T. Lavergne (May 2016), Global Sea Ice Edge and Type Product User's Manual - v1.3. Technical Report SAF/OSI/CDOP2/MET-Norway/TEC/MA/205, EUMETSAT OSI SAF - Ocean and Sea Ice Satellite Application Facility.
PDF
[2] Aaboe, S., L.-A. Breivik, S. Eastwood and A. Sorensen (April 2015), Global Sea Ice Edge and Type Validation Report - v1.1. Technical Report SAF/OSI/CDOP2/MET-Norway/SCI/RP/224, EUMETSAT OSI SAF - Ocean and Sea Ice Satellite Application Facility.
PDF
[3] Aaboe, S., L.-A. Breivik and S. Eastwood (April 2015), Algorithm Theoretical Basis Document for the OSI SAF Global Sea Ice Edge and Type product - v1.2. Technical Report SAF/OSI/CDOP2/MET_Norway/SCI/MA/208, EUMETSAT OSI SAF - Ocean and Sea Ice Sattelite Application Facility.
PDF
[4] Aaboe, S., L.-A. Breivik and S. Eastwood (2014), Improvement of OSI SAF Product of Sea Ice Edge and Sea Ice Type. EUMETSAT Meteorological Satellite Conference, Geneva (Switzerland), September 2014.
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