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Comparison of hybrid schemes for the combination of shallow approximations in numerical simulations of the Antarctic Ice Sheet


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タイトル: Comparison of hybrid schemes for the combination of shallow approximations in numerical simulations of the Antarctic Ice Sheet
著者: Bernales, Jorge 著作を一覧する
Rogozhina, Irina 著作を一覧する
Greve, Ralf 著作を一覧する
Thomas, Maik 著作を一覧する
発行日: 2017年 1月27日
出版者: Copernicus Publications on behalf of the European Geosciences Union (EGU)
誌名: The Cryosphere
巻: 11
号: 1
開始ページ: 247
終了ページ: 265
出版社 DOI: 10.5194/tc-11-247-2017
抄録: The shallow ice approximation (SIA) is commonly used in ice-sheet models to simplify the force balance equations within the ice. However, the SIA cannot adequately reproduce the dynamics of the fast flowing ice streams usually found at the margins of ice sheets. To overcome this limitation, recent studies have introduced heuristic hybrid combinations of the SIA and the shelfy stream approximation. Here, we implement four different hybrid schemes into a model of the Antarctic Ice Sheet in order to compare their performance under present-day conditions. For each scheme, the model is calibrated using an iterative technique to infer the spatial variability in basal sliding parameters. Model results are validated against topographic and velocity data. Our analysis shows that the iterative technique compensates for the differences between the schemes, producing similar ice-sheet configurations through quantitatively different results of the sliding coefficient calibration. Despite this we observe a robust agreement in the reconstructed patterns of basal sliding parameters. We exchange the calibrated sliding parameter distributions between the schemes to demonstrate that the results of the model calibration cannot be straightforwardly transferred to models based on different approximations of ice dynamics. However, easily adaptable calibration techniques for the potential distribution of basal sliding coefficients can be implemented into ice models to overcome such incompatibility, as shown in this study.
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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