WEKO3
アイテム
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 |
---|---|---|
![]() |
Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||||
---|---|---|---|---|---|---|---|---|
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
|
|||||||
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 |
|||||||
出版者 | ||||||||
出版者 | National Institute of Polar Research |