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Regional modeling of the Shirase drainage basin, East Antarctica : full Stokes vs. shallow ice dynamics


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タイトル: Regional modeling of the Shirase drainage basin, East Antarctica : full Stokes vs. shallow ice dynamics
著者: Seddik, Hakime 著作を一覧する
Greve, Ralf 著作を一覧する
Zwinger, Thomas 著作を一覧する
Sugiyama, Shin 著作を一覧する
発行日: 2017年 9月18日
出版者: Copernicus Publications on behalf of the European Geosciences Union (EGU)
誌名: The Cryosphere
巻: 11
号: 5
開始ページ: 2213
終了ページ: 2229
出版社 DOI: 10.5194/tc-11-2213-2017
抄録: A hierarchy of approximations of the force balance for the flow of grounded ice exists, ranging from the most sophisticated full Stokes (FS) formulation to the most simplified shallow ice approximation (SIA). Both are implemented in the ice flow model Elmer/Ice, and we compare them by applying the model to the East Antarctic Shirase drainage basin. First, we apply the control inverse method to infer the distribution of basal friction with FS. We then compare FS and SIA by simulating the flow of the drainage basin under present-day conditions and for three scenarios 100 years into the future defined by the SeaRISE (Sea-level Response to Ice Sheet Evolution) project. FS reproduces the observed flow pattern of the drainage basin well, in particular the zone of fast flow near the grounding line, while SIA generally overpredicts the surface velocities. As for the transient scenarios, the ice volume change (relative to the constantclimate control run) of the surface climate experiment is nearly the same for FS and SIA, while for the basal sliding experiment (halved basal friction), the ice volume change is 30% larger for SIA than for FS. This confirms findings of earlier studies that, in order to model ice sheet areas containing ice streams and outlet glaciers with high resolution and precision, careful consideration must be given to the choice of a suitable force balance.
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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