Imminent ‘Death Spiral’ for Rapidly Melting Alaska Ice Field – Researchers Warn
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By: BRETT WILKINS
Jul 02, 2024
The melting of Alaska’s Juneau ice field—which contains more than 1,000 glaciers—is accelerating and could reach a tipping point much sooner than predicted, according to research published Tuesday.
The study, which was published in the journal Nature Communications, shows that ice loss from the Juneau ice field began accelerating rapidly after 2005.
The paper’s authors found that “rates of area shrinkage were five times faster from 2015-2019 than from 1979-1990,” while glacier volume loss—which had remained relatively consistent from 1770-1979—doubled after 2010.
“Thinning has become pervasive across the icefield plateau since 2005, accompanied by glacier recession and fragmentation,” the study states. “As glacier thinning on the plateau continues, a mass balance-elevation feedback is likely to inhibit future glacier regrowth, potentially pushing glaciers beyond a dynamic tipping point.”
Study lead author Bethan Davies, a glaciologist at Newcastle University in England, said in a statement, “It’s incredibly worrying that our research found a rapid acceleration since the early 21st century in the rate of glacier loss across the Juneau ice field.”
“Alaskan icefields—which are predominantly flat, plateau icefields—are particularly vulnerable to accelerated melt as the climate warms since ice loss happens across the whole surface, meaning a much greater area is affected,” Davies continued. “Additionally, flatter ice caps and icefields cannot retreat to higher elevations and find a new equilibrium.”
“As glacier thinning on the Juneau plateau continues and ice retreats to lower levels and warmer air, the feedback processes this sets in motion is likely to prevent future glacier regrowth, potentially pushing glaciers beyond a tipping point into irreversible recession,” she added.
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