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  >

Ice flow and isostasy of the north polar cap of Mars

Greve_etal_2003_PSS.pdf416.64 kBPDF見る/開く

タイトル: Ice flow and isostasy of the north polar cap of Mars
著者: Greve, Ralf 著作を一覧する
Klemann, Volker 著作を一覧する
Wolf, Detlef 著作を一覧する
キーワード: Mars
Mars surface
Mars interior
Mars climate
発行日: 2003年 3月
出版者: Elsevier
誌名: Planetary and Space Science
巻: 51
号: 3
開始ページ: 193
終了ページ: 204
出版社 DOI: 10.1016/S0032-0633(02)00206-4
抄録: The flow of the north polar cap of Mars, which is assumed to consist mainly of H2O ice, is investigated with the three-dimensional ice-sheet model SICOPOLIS. We consider a simplified topography and a climatic forcing varying between the present state and warmer, more humid conditions in the past with an obliquity cycle of 1.3 million earth years (yr). Furthermore, SICOPOLIS is coupled with the three-layer viscoelastic ground model displace to simulate the isostatic response of the underlying lithosphere/mantle system. Likely ice-flow velocities at present are a few mm/yr, along with surface accumulation/ablation rates of the order of 0.1 mm water equiv./yr and basal temperatures more than 50℃ below pressure melting. Thicknesses of the rheological lithosphere of 50-400 km are consistent with geothermal heat fluxes of 15-36 mWm^-2, with some evidence for values of ca. 80-120 km and 20-30 mWm^-2, respectively. For an Earth-like upper-mantle viscosity of O(10^21 Pas), relaxation times of the lithosphere/mantle system are much shorter than significant load changes, so that the mantle behaves as an inviscid fluid. The poor correlation between the computed and measured free-air gravity signal indicates that it is determined by mass anomalies of a different origin.
資料タイプ: article (author version)
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 へお願いします。 - 北海道大学