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A tiny clue found in ancient deposits(地质沉积物) has unlocked big crets
drainageabout Greenland's past and future climate. Just beyond the northwest edge of the vast Greenland Ice Sheet, rearchers have discovered lake mud that have survived
bressanonthe last ice age. The mud and remains of common flies in it record two inter glacial
periods (间冰期) in northwest Greenland.
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Although rearchers have long known the two periods ⼀the early Holocene and Last Inter glacial ⼀experienced warming in the Arctic, the mix of fly species shows that Greenland was even warmer than previously thought. "As far as we know, it has never been found in Greenland. We think this is the first time anyone has reported it in ancient deposits or modern lakes there," Axford said."We were really surprid to e how far north it migrated (迁徙)."设计专业考研
This new information could help rearchers better measure Greenland's nsitivity to warming, by testing and improving models of climate and ice sheet behaviour.Tho models could then improve predictions of how Greenland's ice sheet might respond to man- made global warming. After all, Greenl
野望翻译and covers 80per cent of the Arctic country and holds enough ice to equal 20 feet of global a level."Northwest Greenland might feel really remote, but what happens to that ice sheet is going to matter to everyone in every coastal city around the world,”said Yarrow Axford, an associate professor in the team."One of the big uncertainties in climate science is how fast the Earth changes when it gets warmer. Geology gives us an opportunity to e what happened when the Earth was warmer than today." said Axford.
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