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Evidence of past migration of the ice divide between the Shirase and Sôya drainage basins derived from chemical characteristics of the marginal ice in the Sôya drainage basin, East Antarctica

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タイトル: Evidence of past migration of the ice divide between the Shirase and Sôya drainage basins derived from chemical characteristics of the marginal ice in the Sôya drainage basin, East Antarctica
著者: Iizuka, Yoshinori 著作を一覧する
Miura, Hideki 著作を一覧する
Iwasaki, Shogo 著作を一覧する
Maemoku, Hideaki 著作を一覧する
Sawagaki, Takanobu 著作を一覧する
Greve, Ralf 著作を一覧する
Satake, Hiroshi 著作を一覧する
Sasa, Kimikazu 著作を一覧する
Matsushi, Yuki 著作を一覧する
キーワード: Antarctic ice sheet
Ice divide
Drainage basin
Stable isotope
Modelling
発行日: 2010年 8月 1日
出版者: International Glaciological Society
誌名: Journal of Glaciology
巻: 56
号: 197
開始ページ: 395
終了ページ: 404
抄録: Ice originating near the inland ice divide of the ice sheet can reappear as marginal ice at the surface near the ice terminal in the ablation area. We have analyzed δ18O values and ion concentrations of the Skallen, Skarvsnes and Hamna terminal ice sections, located along the estuary line in the Sôya drainage basin, East Antarctica. The data suggest that the upper part of the Skallen terminal ice section could have originated from inland precipitation on the Shirase drainage basin during marine isotope stage (MIS) 5e, while the upper part of Skarvsnes and Hamna terminal ice sections could have originated from inland precipitation on the Sôya drainage basin. We calculate past elevation maps for the Antarctic ice sheet using the three-dimensional model, SICOPOLIS. This model suggests that the upstream portion of the Sôya drainage basin during the glacial period (MIS 2, 3 or 4) was located to the northeast of its present location. A flow history is proposed wherein ice from the inland Shirase drainage area flowed over the present ice-divide line from the Shirase to the Sôya drainage basin during the glacial period. The ice in the Sôya drainage basin then flowed to the marginal part of the sheet after the ice divide had assumed its present position.
Rights: © 2010 International Glaciological Society
Relation (URI): http://www.igsoc.org/
資料タイプ: article
URI: http://hdl.handle.net/2115/44809
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 飯塚 芳徳

 

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