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Reprocessed ASI data from 2002 to Oct 2018: Version 5.4

We  have just completed reprocessing all ASI ice concentration data based on AMSR-E or AMSR2 data for the  complete period, i.e.,

  • 1 June, 2002 to 4 Oct, 2011 (AMSR-E)
  •  July, 2012 to 27 Oct,2018 (AMSR2).

The reprocessing has been done for the hemispheric maps only. i.e., Arctic/Antarctic (6.25 km grid spacing) and Arctic3125/Antarctic3125 (3.125 km grid spacing).

The tie points of the ASI algorithm were the same (version 5). However, some other details as the version of GMT (generic mapping tools) used for gridding the data and defining land masks and coast lines have changed over the years. The reprocessed data are therefore consistent with respect to  all this, and have the version number 5.4. The full version number is also part of all file names ('v5.4'); the new files are stored alongside the files of previous versions  5.2 and 5.3 which just have 'v5' in their file names.

The new data being processed every day will be switched to version 5.4 in the next weeks which implies the mentioned change in the file names ('v5.4' instead of just 'v5')

All details about the ASI ice concentration data can be found in the the new ASI user guide

Arctic sea ice concentration

Arctic sea ice concentration
Click to enlarge the image (~1.2 MB).

Sea ice map calculated from AMSR2 data using the ARTIST sea ice algorithm (ASI 5).

Arctic sea ice concentration (different color code)
Click to enlarge the image (~500 KB).

False color sea ice map.

Antarctic sea ice concentration

Antarctic sea ice concentration
Click to enlarge the image (~500 KB).

Sea ice map calculated from AMSR2 data using the ARTIST sea ice algorithm (ASI 5).

Arctic sea ice concentration (different color code)
Click to enlarge the image (~300 KB).

False color sea ice map.

2018 Arctic Sea Ice Minimum

The 2018 sea ice minimum extent was reached on 2018-09-21. Sea ice extent is now increasing again.

Map

Time Series

Minimum & Maximum

Diagram: Arctic sea ice extent during previous 7 years
September is the month when in the Arctic the sea ice area reaches its minimum. The map and time series show a comparison of current ice conditions to previous years.

More maps and information about sea ice minima can be found under Arctic Sea Ice Minima.

Data Archive

All data can be found in the Data Archive. To quickly browse the dataset, please have a look at the Data Browser.

How to cite

Please help maintaining this service by properly citing and acknowledging if you use the data for publications:
Spreen, G., L. Kaleschke, and G.Heygster (2008), Sea ice remote sensing using AMSR-E 89 GHz channels J. Geophys. Res.,vol. 113, C02S03, doi:10.1029/2005JC003384.

Contact

For questions regarding the data please contact Gunnar SpreenChristian Melsheimer, or Georg Heygster.
For questions related to the website and data-browser please contact Malte Gerken.

Institute of Environmental Physics, University of Bremen, Germany.