Using this graphic and referring to it is encouraged, and please use it in presentations, web pages, newspapers, blogs and reports.
For any form of publication, please include the link to this page and give the cartographer/designer credit (in this case Hugo Ahlenius, UNEP/GRID-Arendal)
Armstrong, R.L. and Brodzik, M.J. (2005). Northern Hemisphere EASE-Grid weekly snow cover and sea ice extent version 3. (Digital media). National Snow and Ice Data Center, Boulder Armstrong, R.L., Brodzik, M.J., Knowles, K. and Savoie, M. (2005). Global monthly EASE-Grid snow water equivalent climatology. (Digital media). National Snow and Ice Data Center, Boulder Brown, J., Ferrians Jr., O.J., Heginbottom, J.A. and Melnikov, E.S. (1998 revised February 2001). Circum-Arctic map of permafrost and ground-ice conditions. (Digital media). National Snow and Ice Data Center/World Data Center for Glaciology, Boulder NGA (2000). Vector Map Level 0. National Geospatial-Intelligence Agency. http://geoengine.nima.mil/ftpdir/archive/vpf_ data/v0soa.tar.gz [Accessed 1 September 2006] Stroeve, J. and Meier, W. (1999, updated 2005). Sea Ice Trends and Climatologies from SMMR and SSM/I. National Snow and Ice Data Center. http://nsidc.org/data/smmr_ssmi_ ancillary/monthly_means.html [Accessed 20 April 2007]