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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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Title: 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
Authors: Iizuka, Yoshinori Browse this author →KAKEN DB
Miura, Hideki Browse this author
Iwasaki, Shogo Browse this author
Maemoku, Hideaki Browse this author
Sawagaki, Takanobu Browse this author
Greve, Ralf Browse this author
Satake, Hiroshi Browse this author
Sasa, Kimikazu Browse this author
Matsushi, Yuki Browse this author
Keywords: Antarctic ice sheet
Ice divide
Drainage basin
Stable isotope
Modelling
Issue Date: 1-Aug-2010
Publisher: International Glaciological Society
Journal Title: Journal of Glaciology
Volume: 56
Issue: 197
Start Page: 395
End Page: 404
Abstract: 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: http://www.igsoc.org/
Type: article
URI: http://hdl.handle.net/2115/44809
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 飯塚 芳徳

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