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Modelling the Antarctic marine cryosphere at the Last Glacial Maximum

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タイトル: Modelling the Antarctic marine cryosphere at the Last Glacial Maximum
著者: Kusahara, Kazuya 著作を一覧する
Sato, Tatsuru 著作を一覧する
Oka, Akira 著作を一覧する
Obase, Takashi 著作を一覧する
Greve, Ralf 著作を一覧する
Abe-Ouchi, Ayako 著作を一覧する
Hasumi, Hiroyasu 著作を一覧する
キーワード: climate change
ice shelves
ice/ocean interactions
palaeoclimate
sea-ice modelling
発行日: 2015年10月 1日
出版者: International Glaciological Society
誌名: Annals of Glaciology
巻: 56
号: 69
開始ページ: 425
終了ページ: 435
出版社 DOI: 10.3189/2015AoG69A792
抄録: We estimate the sea-ice extent and basal melt of Antarctic ice shelves at the Last Glacial Maximum (LGM) using a coupled ice-shelf–sea-ice–ocean model. The shape of Antarctic ice shelves, ocean conditions and atmospheric surface conditions at the LGM are different from those in the present day; these are derived from an ice-shelf–ice-sheet model, a sea-ice–ocean model and a climate model for glacial simulations, respectively. The winter sea ice in the LGM is shown to extend up to ~7° of latitude further equatorward than in the present day. For the LGM summer, the model shows extensive sea-ice cover in the Atlantic sector and little sea ice in the other sectors. These modelled sea-ice features are consistent with those reconstructed from sea-floor sedimentary records. Total basal melt of Antarctic ice shelves in the LGM was ~2147 Gt a–1, which is much larger than the present-day value. More warm waters originating from Circumpolar Deep Water could be easily transported into ice-shelf cavities during the LGM because the full glacial grounding line extended to shelf break regions and ice shelves overhung continental slopes. This increased transport of warm water masses underneath an ice shelf and into their basal cavities led to the high basal melt of ice shelves in the LGM.
Rights: © [2015] International Glaciological Society
Relation (URI): http://www.igsoc.org/
資料タイプ: article
URI: http://hdl.handle.net/2115/61464
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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