Climate-driven permafrost thaw

Climate-driven permafrost thaw
Megaslumps in fluvially incised hummocky moraine, Peel Plateau, northwestern Canada. Image courtesy Steven V. Kokelj; a larger version is available. Credit: Steven V. Kokelj

In bitter cold regions like northwestern Canada, permafrost has preserved relict ground-ice and vast glacial sedimentary stores in a quasi-stable state. These landscapes therefore retain a high potential for climate-driven transformation.

In their open-access Geology article published online on 7 Feb. 2017, Steven Kokelj of the Northwest Territories Geological Survey and colleagues write that climate-driven renewal of deglaciation and potential postglacial permafrost landscape evolution has major implications for predicting the nature and trajectories of northern landscape change and the cascade of downstream impacts.

They show that mapping across 1.27 million square kilometers of northwestern Canada points to large thaw-induced slope disturbances (thaw slumps) that delineate the margins of former ice sheets. Recent intensification of this thaw slumping has mobilized primary glacial sediments, triggering a cascade of fluvial, lacustrine, and coastal effects.


Explore further

New permafrost map shows regions vulnerable to thaw, carbon release

More information: Steven V. Kokelj et al. Climate-driven thaw of permafrost preserved glacial landscapes, northwestern Canada, Geology (2017). DOI: 10.1130/G38626.1
Journal information: Geology

Citation: Climate-driven permafrost thaw (2017, February 17) retrieved 5 December 2020 from https://phys.org/news/2017-02-climate-driven-permafrost.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
12 shares

Feedback to editors

User comments