| タイトル |
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en
A full Stokes-flow thermo-mechanical model for firn and ice applied to the Gorshkov crater glacier, Kamchatka
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| 作成者 |
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| アクセス権 |
open access |
| 権利情報 |
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en
© 2007 International Glaciological Society
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| 主題 |
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Other
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Glacier
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Other
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Crater
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Other
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Volcano
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Other
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Flow
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Other
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Modelling
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NDC
452
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| 内容注記 |
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Abstract
en
The Gorshkov crater glacier at Ushkovsky volcano, Kamchatka, is characterized by a large aspect ratio and special thermodynamic conditions at the bedrock caused by a locally enhanced and spatially varying geothermal heat flux. Furthermore, large parts of this glacier consist of firn rather than pure ice, which alters the rheological properties (such as viscosity and compressibility) of the glacier. We present a newly developed, thermo-mechanically coupled, three-dimensional flow model based on the finite-element (FE) modeling software Elmer, and apply it to the Gorshkov crater glacier. By assuming steady-state conditions, the present-day velocity field, temperature field, basal melting rate and age distribution are simulated. We find that flow velocities are generally small (10’s of centimeters per year). Horizontal and vertical velocities are of comparable magnitude, which shows that the shallow-ice approximation is not applicable. Owing to the spatially variable volcanic heat flux, the thermal regime at the ice base is cold in the deeper parts of the glacier and temperate in the shallower parts. The measured temperature profile and age horizons at the K2 borehole are reproduced quite well, and remaining discrepancies may be attributed to transient (non-steady-state) conditions. Firn compressibility is identified as a crucial element for the modeling approach.
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| 出版者 |
en
International Glaciological Society
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| 日付 |
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| 言語 |
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| 資源タイプ |
journal article |
| 出版タイプ |
VoR |
| 資源識別子 |
HDL
http://hdl.handle.net/2115/34532
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| 関連 |
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URI
http://www.igsoc.org/
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isIdenticalTo
DOI
https://doi.org/10.3189/172756407782282543
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| 収録誌情報 |
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PISSN
0260-3055
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EISSN
1727-5644
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en
Annals of Glaciology
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巻45
開始ページ29
終了ページ37
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| ファイル |
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| コンテンツ更新日時 |
2023-09-30 |
