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Snow cover (CLIM 008) - Assessment published Sep 2008
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Snow cover in the northern hemisphere has fallen by 1.3 % per decade during the past 40 years. The largest losses are during spring and summer. Model simulations project widespread reductions in the extent and duration of snow cover in Europe over the 21st century. Changes in snow cover affect the Earth's surface reflectivity, river discharge, vegetation, agriculture and animal husbandry, tourism, snow sports, transport and power generation.
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Snow cover
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Observed change in spring snow-cover duration 1970-2004
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The map shows the observed change in spring snow-cover duration 1970 to 2004 covering
the Northern Hemisphere
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Annual number of days with snow cover over European land areas 1961-1990 and projected change for 2071-2100
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Note: Results are based on seven regional climate-model simulations.
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Snow cover (CLIM 008) - Assessment published Nov 2012
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Snow cover extent in the Northern Hemisphere has fallen by 7 % in March and 11 % in April during the past 4 decades. In winter and autumn no significant changes have occurred.
Snow mass in Europe has decreased by 7 % in March from 1982 to 2009.
Model simulations project widespread reductions in the extent and duration of snow cover in Europe over the 21st century. However, there are large uncertainties in the projections.
Changes in snow cover affect the Earth’s surface reflectivity, water resources, the flora and fauna and their ecology, agriculture, forestry, tourism, snow sports, transport and power generation.
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Snow cover
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Northern hemisphere snow-cover extent variation 1966-2005
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The figure shows the snow-cover extent variation 1966 - 2005
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