Name: Ice duration (days)

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Description: Ice duration was derived from ice cover data obtained from the Great Lakes Ice Atlas and NOAA Great Lakes Environmental Research Laboratory. Ice cover data are available as a daily percent ice cover grid for the ice season (December 1 – May 31). Using the threshold of 10%, the duration, in days, was tallied for each ice season and averaged over the years 2006-2012. The gridded ice data was obtained from National Oceanic and Atmospheric Administration's Great Lakes Ice Atlas (http://www.glerl.noaa.gov/data/ice/atlas/) and NOAA Great Lakes Environmental Research Laboratory (http://www.glerl.noaa.gov/data/pgs/glice/glice.html) for the years 2006-2012. Daily interpolations were creating following the methods in Assel (2005). For each winter season the daily files were summed for each pixel if the ice concentration was greater than or equal to 10% to give the duration in days for the season. The final tally is the resulting raster.

Service Item Id: def7fc9d9ec8420ba5a16488ba0a48c9

Copyright Text: 1) Assel, R.A., (2005). Great Lakes Ice Cover Climatoloty Update: Winters 2003, 2004, and 2005. NOAA GLERL Technical Memorandum TM-135, Ann Arbor, MI. 2) The Great Lakes Aquatic Habitat Framework (GLAHF) project has been funded by the Great Lakes Fishery Trust and led by Dr. Catherine Riseng, PI at the University of Michigan School of Natural Resources and Environment, with partners from Michigan Department of Natural Resources-Institute for Fisheries Research, NOAA Great Lakes Environmental Research Laboratory, International Joint Commission, Michigan State University, The Nature Conservancy, Ontario Ministry of Natural Resources, University of Minnesota-Duluth, U.S. Fish & Wildlife Service, U.S. Geological Survey and many collaborating partners in both the USA and Canada. More information about this project can be found at http://glahf.org/.

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