A new study, led by the University of Massachusetts Amherst, clearly resolves a long-standing inconsistency in geological records comparing studies of ocean ice sheet behavior with reconstructions of past states on land.Studies recently published in the journal Geology, Funded by the National Science Foundation and the National Institute for Environmental Studies, it gives additional weight to prove that the Antarctic ice sheet is sensitive to small changes in CO.2 Levels, and in the past, most of the ice sheet may have disappeared under CO2 Same level as today.
There has been decades of debate among scientists studying the history of the Antarctic ice sheet, with oceanographic data from the Ross Sea and data collected at the adjacent McMurdo Dry Valley, an ice-free mountain coastal region. To the Ross Sea, which revolves around the disagreement between the two.Ocean record from standing in one corner Seabed This indicates that the Antarctic ice sheet has repeatedly shrunk to smaller sizes over the last 10 million years, and the ice-covered Ross Sea has regularly been in the open ocean. This suggests that the Antarctic ice sheet is sensitive to relatively small CO.2 And retreated during temperature fluctuations and past warm periods.
In the other corner, a ground survey of McMurdo Dry Valley’s old and well-preserved terrain revealed that the state of the cold desert of the land had been maintained for the same 10 million years, partly. Researchers conclude that: Because the stable Antarctic ice sheet has persisted over multiple past warming periods, it may be less susceptible to climate warming than oceanographic data suggest.
Is the West Antarctic Ice Sheet Sensitive to Global Warming? Resolving this argument is important for the planet, as the same part of the Antarctic ice sheet that collapsed in the past could raise future sea levels by more than 10 feet if it collapsed in our time.
Anna Ruth Halberstadt completed this study as part of her PhD using a series of high-resolution climate and ice sheet models. In the field of Earth sciences at UMass Amherst, her colleagues were able to show that McMurdo Dry Valley could have sub-zero temperatures even if the nearby Ross Sea was not completely frozen. “Now we know why these two datasets seem to be inconsistent,” said Halberstadt, the lead author of the paper.
Halberstadt and her team conducted a series of experiments using state-of-the-art climate and sea ice models, which could ensure that McMurd Dry Dry remained frozen even when the ice sheet collapsed. I showed that. “This work will eventually neatly organize all geological information, suggesting that most of the Antarctic ice sheet may have collapsed under the same climatic conditions as it is today,” Halberstadt said. It states.
Anna Ruth W. Halberstadt et al, Coordination between sub-zero temperatures and Neogene dynamic ocean ice sheet fluctuations in McMurdo Dry Valley, Antarctica, Geology (2022). DOI: 10.1130 / G49664.1
University of Massachusetts Amherst
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New research solves the mystery of long-standing Antarctic climate change
Source link New research solves the mystery of long-standing Antarctic climate change