Sea ice edge comparison

In order to make a comparative statement about the change in the sea ice concentration in different regions for different months and years, the differences of the ice edges are shown on a map. For this purpose, the monthly mean position of the ice edge (<15% sea ice concentration) for the respective month of the year can be calculated from the data of the sea ice concentration of the University of Bremen (Institute of Environmental Physics). Differences can then be queried for the long-term average (from 2003 to 2014) or for a monthly mean of the same month of any year. Thus, regions with a sea ice gain (blue) and a sea ice take-off (red) become clearly visible.

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For the use of, users are asked to include the following citation:

  1. Grosfeld, K.; Treffeisen, R.; Asseng, J.; Bartsch, A.; Bräuer, B.; Fritzsch, B.; Gerdes, R.; Hendricks, S.; Hiller, W.; Heygster, G.; Krumpen, T.; Lemke, P.; Melsheimer, C.; Nicolaus, M.; Ricker, R. and Weigelt, M. (2016), Online sea-ice knowledge and data platform <>, Polarforschung, Bremerhaven, Alfred Wegener Institute for Polar and Marine Research & German Society of Polar Research, 85 (2), 143-155, doi:10.2312/polfor.2016.011 (PDF).

For the use of the specific data from the data portal of, users are asked to include the associated citations as indicated below.

For all sea ice concentration data, please

  1. include the following phrase into the acknowledgment: Sea ice concentration data from DATE to DATE were obtained from (grant: REKLIM-2013-04).
  2. refer to: Spreen, G.; Kaleschke, L. and Heygster, G. (2008), Sea ice remote sensing using AMSR-E 89 GHz channels J. Geophys. Res.,vol. 113, C02S03, doi:10.1029/2005JC003384.

In case of questions or any difficulties, please contact us at: Meereisportal Team.