Moisture supply for northern ice-sheet growth during the Last Glacial Maximum
作者： Dierk Hebbeln , Trond Dokken , Espen S. Andersen , Morten Hald , Anders Elverhøi
DOI: 10.1038/370357A0
关键词:
摘要: DURING the last ice age, Barents Sea sheet began to grow 22 kyr ago1, only 8 before it disintegrate2. This implies that must have grown very rapidly from coast edge of continental shelf. Such rapid growth a large requires significant amounts moisture3, but origin this moisture has been unclear, particularly as CLIMAP climate reconstruction suggests4,5 Greenland–Iceland–Norwegian (GIN) seas were perennially ice-covered during period. Here we present data deep-sea sediment cores Fram Strait, which suggest relatively warm water North Atlantic Ocean was advected into GIN in two short-term events (27–22.5 and 19.5–14.5 ago). We resulting seasonally ice-free waters an important regional source for sheet, played much more active role glaciation than previously supposed.
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