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Evolution of the north-polar cap of Mars : a modelling study

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タイトル: Evolution of the north-polar cap of Mars : a modelling study
著者: Greve, Ralf 著作を一覧する
Mahajan, Rupali A. 著作を一覧する
Segschneider, Joachim 著作を一覧する
Grieger, Björn 著作を一覧する
キーワード: Mars
Ice
North-polar cap
Polar layered deposits
Ice flow
Obliquity cycle
発行日: 2004年 8月
出版者: Elsevier
誌名: Planetary and Space Science
巻: 52
号: 9
開始ページ: 775
終了ページ: 787
出版社 DOI: 10.1016/j.pss.2004.03.007
抄録: Celestial-mechanical computations show that, even stronger than for Earth, Mars is subject to Milanković cycles, that is, quasi-periodic variations of the orbital parameters obliquity, eccentricity and precession. Consequently, solar insolation varies on time-scales of 104–105 years. It has long been supposed that this entails climatic cycles like the terrestrial glacialinterglacial cycles. This hypothesis is supported by the light-dark layered deposits of the north- and south-polar caps indicating a strongly varying dust content of the ice due to varying climate conditions in the past. This study aims at simulating the dynamic and thermodynamic evolution of the north-polar cap (NPC) of Mars with the ice-sheet model SICOPOLIS. The boundary conditions of surface accumulation, ablation and temperature are derived directly from the solar-insolation history by applying the newly developed Mars Atmosphere-Ice Coupler MAIC. We consider steady-state scenarios under present climate conditions as well as transient scenarios over climatic cycles. It is found that the NPC is most likely not in steady state with the present climate. The topography of the NPC is mainly controlled by the history of the surface mass balance. Ice flow, which is of the order of 1 mma−1, plays only a minor role. In order to build up the present cap during the last five million years of relatively low obliquities, a present accumulation rate of ≥ 0.25 mm water equiv. a−1 is required. Computed basal temperatures are far below pressure melting for all simulations and all times.
Relation (URI): http://www.sciencedirect.com/science/journal/00320633
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/32734
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

 

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