HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
低温科学研究所  >
雑誌発表論文等  >

A full Stokes-flow thermo-mechanical model for firn and ice applied to the Gorshkov crater glacier, Kamchatka

フルテキスト
Zwinger_etal_2007_AnnGlac.pdf421.63 kBPDF見る/開く
この文献へのリンクには次のURLを使用してください:http://hdl.handle.net/2115/34532

タイトル: A full Stokes-flow thermo-mechanical model for firn and ice applied to the Gorshkov crater glacier, Kamchatka
著者: Zwinger, Thomas 著作を一覧する
Greve, Ralf 著作を一覧する
Gagliardini, Olivier 著作を一覧する
Shiraiwa, Takayuki 著作を一覧する
Lyly, Mikko 著作を一覧する
キーワード: Glacier
Crater
Volcano
Flow
Modelling
発行日: 2007年10月 1日
出版者: International Glaciological Society
誌名: Annals of Glaciology
巻: 45
開始ページ: 29
終了ページ: 37
出版社 DOI: 10.3189/172756407782282543
抄録: 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.
Rights: © 2007 International Glaciological Society
関連URI: http://www.igsoc.org/
資料タイプ: article
URI: http://hdl.handle.net/2115/34532
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

 

本サイトに関するご意見・お問い合わせは repo at lib.hokudai.ac.jp へお願いします。 - 北海道大学