Thawing took a big jump in the winter of 2017-18, when new taliks were found at 24 of the sites, the study found. That coincided with exceptionally snowy and warm conditions that winter.
Louise Farquharson, a University of Alaska Fairbanks permafrost expert, checks conditions off the Seward Peninsula’s Kougarok Road on July 23, 2019. The Seward Peninsula, in northwestern Alaska, had nine sites of new talik formation that emerged in 2018, according to research by Farquharson and her UAF colleagues.
Taliks are sections of year-round thawed soil that are wedged in areas with permafrost, generally between the lower layers that remain in freeze and the active surface layers that freeze and thaw with the seasons. The state of thaw took a big jump in the winter of 2017-18, when new taliks were found at 24 of the sites, the study found. That coincided with exceptionally snowy and warm conditions that winter.
Warmer winter air temperatures are tied to talik formation, as is thick snow cover, which insulates the ground from the winter cold, said lead author Louise Farquharson, a research assistant professor at UAF’s Geophysical Institute.Since the presence of talik enables further thaw, talik expansion has implications for release into the air of carbon long sequestered in permafrost, she said. “This is going to really accelerate the amount of carbon mobilization that happens,” she said.
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