|
| File type |
Download |
Size |
Language |
.jpg
|
Download |
105 kb
|
- |
Use constraints
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)
Source(s)
S. Smith; updated from Smith, S.L., Burgess, M.M., Riseborough, D. and Nixon, F.M. (2005). Recent trends from Canadian permafrost thermal monitoring network sites. Permafrost and Periglacial Processes, 16, 19-30
|
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:
72
Downloads: 15
Rating: 
|
