HomeAboutActivitiesMapsPhotosPublicationsNews
 
Home >> Global Outlook for Ice and Snow >> Trends in permafrost temperatures in the central and northern Mackenzie Valley, 1984-2006
File type Download Size Language
.jpg .jpg Download 105 kb -
Uploaded on Saturday 25 Feb 2012 by GRID-Arendal

Trends in permafrost temperatures in the central and northern Mackenzie Valley, 1984-2006

Year: 2007 Author: Hugo Ahlenius, UNEP/GRID-Arendal
Description:
Temperature monitoring in Canada indicates a warming of shallow permafrost over the last two to three decades. Since the mid-1980s, shallow permafrost (upper 20-30 m) has generally warmed in the Mackenzie Valley. The greatest increases in temperature were 0.3 to 1°C per decade in the cold and thick permafrost of the central and northern valley. In the southern Mackenzie Valley, where permafrost is thin and close to 0°C, no significant trend in permafrost temperature is observed. This absence of a trend is probably due to the fact that this permafrost is ice-rich; a lot of heat is absorbed to melt the ice before an actual temperature change occurs. A similar lack of temperature trend is found for warm and thin permafrost in the southern Yukon Territory.
Views: 269     Downloads: 77     Rating: 3
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