[New post] West Antarctic Ice Sheet retreated far inland, re-advanced since last Ice Age
oldbrew posted: " This research suggests natural climate variation in Antarctica has a much wider range than expected. - - - The West Antarctic Ice Sheet is melting rapidly, claims EurekAlert, raising concerns it could cross a tipping point of irreversible retreat in t" Tallbloke's Talkshop
This research suggests natural climate variation in Antarctica has a much wider range than expected. - - - The West Antarctic Ice Sheet is melting rapidly, claims EurekAlert, raising concerns it could cross a tipping point of irreversible retreat in the next few decades if global temperatures rise 1.5 to 2.0 degrees Celsius (2.7 to 3.8 degrees Fahrenheit) above pre-industrial levels.
New research finds that 6,000 years ago, the grounded edge of the ice sheet may have been as far as 250 kilometers (160 miles) inland from its current location, suggesting the ice retreated deep into the continent after the end of the last ice age and re-advanced before modern retreat began.
"In the last few thousand years before we started watching, ice in some parts of Antarctica retreated and re-advanced over a much larger area than we previously appreciated," said Ryan Venturelli, a paleoglaciologist at Colorado School of Mines and lead author of the new study. "The ongoing retreat of Thwaites Glacier is much faster than we've ever seen before, but in the geologic record, we see the ice can recover."
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