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Permafrost line recedes 130 km in 50 years, Canadian study finds

Date:
February 17, 2010
Source:
Université Laval
Summary:
The southern limit of permanently frozen ground, or permafrost, is now 130 kilometers further north than it was 50 years ago in the James Bay region, according to researchers. In a new study, they suggest that, if the trend continues, permafrost in the region will completely disappear in the near future.

Pictured are lichen and shrub--covered palsas surrounded by a pond resulting from melting permafrost in a bog near the village of Radisson, Canada.
Credit: Serge Payette

The southern limit of permanently frozen ground, or permafrost, is now 130 kilometers further north than it was 50 years ago in the James Bay region, according to two researchers from the Department of Biology at Université Laval.

In a recent issue of the scientific journal Permafrost and Periglacial Processes, Serge Payette and Simon Thibault suggest that, if the trend continues, permafrost in the region will completely disappear in the near future.

The researchers measured the retreat of the permafrost border by observing hummocks known as "palsas," which form naturally over ice contained in the soil of northern peat bogs. Conditions in these mounds are conducive to the development of distinct vegetation -- lichen, shrubs, and black spruce -- that make them easy to spot in the field.

In an initial survey in 2004, the researchers examined seven bogs located between the 51st and 53rd parallels. They noted at that time that only two of the bogs contained palsas, whereas aerial photos taken in 1957 showed palsas present in all of the bogs. A second assessment in 2005 revealed that the number of palsas present in these two bogs had decreased over the course of one year by 86% and 90% respectively.

Helicopter flyovers between the 51st and 55th parallels also revealed that the palsas are in an advanced state of deterioration over the entire James Bay area.

While climate change is the most probable explanation for this phenomenon, the lack of long term climatic data for the area makes it impossible for the researchers to officially confirm this. Professor Payette notes, however, that the average annual temperature of the northern sites he has studied for over 20 years has increased by 2 degrees Celsius.

"If this trend keeps up, what is left of the palsas in the James Bay bogs will disappear altogether in the near future, and it is likely that the permafrost will suffer the same fate," concludes the researcher affiliated to the Centre d'études nordiques.


Story Source:

The above story is based on materials provided by Université Laval. Note: Materials may be edited for content and length.


Journal Reference:

  1. Simon Thibault, Serge Payette. Recent permafrost degradation in bogs of the James Bay area, northern Quebec, Canada. Permafrost and Periglacial Processes, 2009; 20 (4): 383 DOI: 10.1002/ppp.660

Cite This Page:

Université Laval. "Permafrost line recedes 130 km in 50 years, Canadian study finds." ScienceDaily. ScienceDaily, 17 February 2010. <www.sciencedaily.com/releases/2010/02/100217101129.htm>.
Université Laval. (2010, February 17). Permafrost line recedes 130 km in 50 years, Canadian study finds. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2010/02/100217101129.htm
Université Laval. "Permafrost line recedes 130 km in 50 years, Canadian study finds." ScienceDaily. www.sciencedaily.com/releases/2010/02/100217101129.htm (accessed July 25, 2014).

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