Research co-led by Simon Fraser University and the University of British Columbia shows that amplified global warming in the Canadian High Arctic drove a profound shift in the structure of a river network carved into a permafrost landscape in only 60 years.
for heat exchange, which can increase local rates of permafrost thaw," says study co-author Mark Jellinek, professor of Earth, Ocean and Atmospheric Sciences at the University of British Columbia."These cascading effects can enhance the release of greenhouse gases in the Arctic as organic soil carbon thaws and the permafrost retreats."
Flooding from the valley lake, and seasonal melt of the snowpack and ground ice contributes water which coalesces down valley, setting the conditions for coarse sediment transport and the development of channel networks along the valley floor. However, the timing of flooding during peak thaw can influence how much erosion occurs.
The Axel Heiberg 2019 team headed into the field for a long day of data collection and hiking. Credit: Mark Jellinek
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