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Ice-flow characteristics over a rough bedrock: implications for ice-core interpretation
https://doi.org/10.15094/00002945
https://doi.org/10.15094/00002945a8a51f07-a4df-4013-a555-5b6862ce058a
名前 / ファイル | ライセンス | アクション |
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KJ00000043818 (1.3 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 2002-11-01 | |||||
タイトル | ||||||
タイトル | Ice-flow characteristics over a rough bedrock: implications for ice-core interpretation | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00002945 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Pattyn, Frank
× Pattyn, Frank |
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著者所属(英) | ||||||
en | ||||||
Department of Geography, Vrije Universiteit Brussel | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Recent observations in western Dronning Maud Land, Antarctica, point to a relatively high bedrock roughness in the area of the future EPICA drilling site. It is commonly accepted that such a roughness does not favor the interpretation of deep ice cores as basal ice-sheet interactions might disturb the bottom ice layers. The present study aims at examining the ice-flow characteristics over a strongly undulating bed and investigates its influence on age-depth profiles in the ice sheet.For this purpose a high-resolution time-dependent two-dimensional flowline model was developed (horizontal gridsize ≦ 1km), taking into account all relevant stresses at such a small scale. The model is solved on a fixed finite-difference grid, and compared with a similar model, solving the velocity field according to the shallow-ice approximation. The analysis is presented for sinusoidal bedrock undulations with amplitude-to-wavelength ratio comparable to those observed by radio-echo sounding (D.Steinhage et al., Ann. Glaciol., 29, 267, 1999). Calculations are performed over a period of 300 ka. Results demonstrate that the influence of a high bed roughness on the age-depth profiles is not only confined close to the bed, but near the surface as well, which might affect the interpretation of shallow ice cores. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA1129795X | |||||
書誌情報 |
Polar meteorology and glaciology 巻 16, p. 42-52, 発行日 2002-11 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |