Sea ice concentration
The data, maps and sea ice analyses of the Arctic and Antarctic available for download are based on the information
of the satellite radiometers mentioned below. Measurements of the satellite radiometer AMSR-E range from June 19th,
2002 until September 30th, 2011. On Oct 4, 2011, measurements of AMSR-E stopped.
AMSR-E‘s successor AMSR2 was successfully deployed to orbit on May 18th 2012. Since August 1st, 2012 AMSR2 has been
sending microwave data from which daily sea ice concentrations are derived. Sea ice concentration based on SSMIS has been available from
October 1st, 2011 up to today. Data of AMSR2 is of higher quality than SSMIS data. On meereisportal.de, SSMIS data is
therefore only used to fill data gaps of AMSR2. The sensor used to define sea ice concentrations is recorded in the
name of the respective daily file.
The sea ice concentration data is written in HDF-format. The coordinates and land mask files needed for further
processing can be downloaded here and will be needed only once per hemisphere.
All sea ice concentration data of the Arctic and the Antarctic, including data until June 19th 2002, (HDF-format)
from the University of Bremen (Institute of Environmental Physics) can
be accessed here. This site includes data
sets for Arctic, Antarctic and, in a higher temporal resolution (3.125km), a number of regional maps.
They use a polar stereographic projection with equal area at 70° latitude. The geographical coordinates of the pixels are given in separate files
are in this file for Arctic
and in this file for Antarctica.
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If there are any questions or difficulties, please do not hesitate to contact firstname.lastname@example.org.
We are pleased to help and steadily improve our offer.
Furthermore, downloads of daily updated KMZ files usable for Google Earth depictions are available for the
Soon, also KMZ- and GeoTIFF-files will be available for download for the entire period via the selection menu.
Besides the daily data sets, monthly data sets can be downloaded as well. Development, validation and improvement of
the evaluating algorithms were performed in connection with the EU project DAMOCLES (Developing Arctic Modeling and
Observing Capabilities for Long-term Environmental Studies). Sea ice extent was determined by direct satellite
measurements and the so-called “ARTIST” sea ice algorithm. It has been used and validated in many scientific
We assume no liability for any of the provided data available for downloaded.
Sea ice concentration is represented in the maps by a uniform color scale: White represents a sea ice concentration
of 100%, dark blue marks the regions with the lowest sea ice concentration. According to standard definition , sea
ice extent is the continuous area for which a sea ice concentration of at least 15 % is measured.
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