New permafrost map shows areas in Alaska vulnerable to thaw-induced collapses

Map showing areas of Alaska and Canada and the likely thermokarst landform they will develop as the climate changes. (University of Alaska Fairbanks)
Map showing areas of Alaska and Canada and the likely thermokarst landform they will develop as the climate changes. (University of Alaska Fairbanks)
A new map of northern hemisphere permafrost identifies the areas that are most vulnerable to thawing and slumping.

The map shows which regions in the circumpolar north are susceptible to the permafrost formations known as “thermokarsts,” where the land surface collapses when ice within the soil thaws and drains away. Thermokarst features can be sinkholes, gullies, new wetlands or expanded lakes, each with varying effects on emissions of greenhouse gas containing carbon that had previously been trapped in hard-frozen ground.

Greenhouse gases like carbon dioxide and methane are blamed by scientists for rising Earth temperatures and global climate change. Melting permafrost is expected to accelerate climate change caused by burning fossil fuels.

The map is the product of a project led by University of Alberta researcher David Olefeldt. University of Alaska Fairbanks scientists Vladimir Romanovsky and David McGuire were part of the project team. Results are described in a new study published in the online journal Nature Communications.

The study found that about 20 percent of the world’s northern permafrost region has potential to become a thermokarst landscape. About half of the underground organic carbon is stored in those thermokarst-prone areas, making future thaw especially significant, the study says.

Among the most vulnerable areas are Alaska’s North Slope and the Yukon River delta, according to the study.

Areas susceptible to thermokarst formations are those that hold relatively large amounts of ice, McGuire said in an email.

The study does not specifically identify the areas that have the most warming nor does it predict future thermokarst. Rather, it identifies areas that will be sensitive to warming should it occur, said McGuire, who is also with the U.S. Geological Survey.

Thermokarsts are expected to become more prevalent as the Arctic climate warms, the study said.

“Vulnerability to thermokarst development is likely to increase this century both due to climate change and associated higher frequencies of disturbances such as wildfire and floods,” the study says.

Related stories from around the North:

Canada: Canadian river carries carbon from thawing permafrost to sea, Alaska Dispatch News

Finland:  Climate change brings new insect arrivals to Finland, Yle News

Greenland: Can we still avert irreversible ice sheet melt?, Deutsche Welle’s Ice-Blog

Norway:  UN Secretary-General to visit Norwegian Arctic, Eye on the Arctic

Russia:  Ancient virus found in Arctic permafrost, Alaska Dispatch News

Sweden:  How will global warming affect the average Swede?, Radio Sweden

United States:  Record permafrost erosion in Alaska bodes ill for Arctic infrastructure, Deutsche Welle Ice-Blog

Do you want to report an error or a typo? Click here!

Leave a Reply

Note: By submitting your comments, you acknowledge that Radio Canada International has the right to reproduce, broadcast and publicize those comments or any part thereof in any manner whatsoever. Radio Canada International does not endorse any of the views posted. Your comments will be pre-moderated and published if they meet netiquette guidelines.
Netiquette »

Your email address will not be published. Required fields are marked *