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Deglaciation of the Northern Hemisphere at the onset of the Eemian and Holocene

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タイトル: Deglaciation of the Northern Hemisphere at the onset of the Eemian and Holocene
著者: Greve, Ralf 著作を一覧する
Wyrwoll, Karl-Heinz 著作を一覧する
Eisenhauer, Anton 著作を一覧する
キーワード: Milankovitch forcing
Northern hemisphere
Ice sheet
発行日: 1999年 1月
出版者: International Glaciological Society
誌名: Annals of Glaciology
巻: 28
開始ページ: 1
終了ページ: 8
出版社 DOI: 10.3189/172756499781821643
抄録: High resolution (TIMS) U-series dating of sea-level events obtained from coral-reef complexes suggests that global deglaciation from the Saale (penultimate) glacial to the Eem Interglacial (marine δ18O stages 6/5) may have occurred earlier in relation to Milankovitch insolation forcing than that from the Wisconsinan glacial to the Holocene Interglacial (marine δ18O stages 2/1). However, the interpretation of these data has been problematic because of the possibility of isotope exchange. In order to investigate whether these different lead-lag relations between Milankovitch forcing and ice volume are feasible from the point of view of large-scale ice-sheet dynamics and thermodynamics, the three-dimensional polythermal ice-sheet model SICOPOLIS (Simulation Code for Polythermal Ice Sheets) is applied to the entire Northern Hemisphere (which gives the major contribution to global ice-volume changes due to the relative stability of the Antarctic ice sheet) and simulations through the last two climatic cycles are conducted. The simulations cover the interval from 250 kyr BP until today and are driven by surface-temperature reconstructions of deep ice cores (GRIP, Vostok) and simple parameterizations for the change of precipitation with time. Discussion of the results is focused on the Saale/Eem and the Wisconsinan/Holocene transitions. The amount and rate of deglaciation are in good agreement with the SPECMAP record for both cases, and the evidence of the data for an early start of the Eem Interglacial is supported.
Rights: © 1999 International Glaciological Society
Relation (URI):
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: Greve Ralf


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