This animation shows monthly average sea ice climatology from September through August displayed at a rate of two months per second. The month is shown in the upper right corner.
Sea ice advances and retreats in concert with the seasons. Monthly sea ice climatology is created by averaging the sea ice for each month over a period of many years. This animation shows the monthly average sea ice climatology over the Arctic region derived from years 1979 through 2002.
GCMD keywords can be found on the Internet with the following citation:
Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 184.108.40.206.0