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Uploaded on Tuesday 21 Feb 2012 by GRID-Arendal

Northern Hemisphere snow-cover extent anomalies 1966-2005

Year: 2007 Author: Hugo Ahlenius, UNEP/GRID-Arendal
Data from satellite monitoring from 1966 to 2005 show that mean monthly snow-cover extent in the Northern Hemisphere is decreasing at a rate of 1.3 per cent per decade. For the calendar year of 2006 average snow-cover extent was 24.9 million km2, which is 0.6 million km2 less than the 37-year average. In the Northern Hemisphere, spring and summer show the strongest decreases in snow-cover extent. Satellite observations of snow-cover extent show a decreasing trend in the Northern Hemisphere for every month except November and December, with the most significant decreasing trends during May to August. The departures (anomaly) from the monthly means is displayed in this figure, together with the 12-month running mean. The decreasing trend of –1.3% per decade is significant at the 90% level.
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Mean snow-cover extent in the Northern Hemisphere 1966-2006
Ice sheets, schematic illustration for Greenland and Antarctica
Major glacier hazard locations
Sea ice concentration change over the 21st century as projected by climate models
Glacier changes on Nevado de Santa Isabel, Colombia
Projected reduction in snow 2080-2100
Ice avalanches of the Nevados Huascarán in Peru
Projected winter temperature changes in the Arctic