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Response of the intermediate complexity Mars Climate Simulator to different obliquity angles

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Title: Response of the intermediate complexity Mars Climate Simulator to different obliquity angles
Authors: Segschneider, J. Browse this author
Grieger, B. Browse this author
U. Keller, H. Browse this author
Lunkeit, F. Browse this author
Kirk, E.. Browse this author
Fraedrich, K. Browse this author
Rodin, A. Browse this author
Greve, R. Browse this author
Keywords: Mars
Mars climate
Mars atmosphere
Climate modelling
Atmospheric dynamics
Issue Date: May-2005
Publisher: Elsevier
Journal Title: Planetary and Space Science
Volume: 53
Issue: 6
Start Page: 659
End Page: 670
Publisher DOI: 10.1016/j.pss.2004.10.003
Abstract: A climate model of intermediate complexity, named the Mars Climate Simulator, has been developed based on the Portable University Model of the Atmosphere (PUMA). The main goal of this new development is to simulate the climate variations on Mars resulting from the changes in orbital parameters and their impact on the layered polar terrains (also known as permanent polar ice caps). As a first step towards transient simulations over several obliquity cycles, the model is applied to simulate the dynamical and thermodynamical response of the Martian climate system to different but fixed obliquity angles. The model is forced by the annual and daily cycle of solar insolation. Experiments have been performed for obliquities of φ=15°(minimum), φ=25.2°(present), and φ=35°(maximum). The resulting changes in solar insolation mainly in the polar regions impact strongly on the cross-equatorial circulation which is driven by the meridional temperature gradient and steered by the Martian topography. At high obliquity, the cross-equatorial near surface flow from the winter to the summer hemisphere is strongly enhanced compared to low obliquity periods. The summer ground temperature ranges from 200 K (φ=15°) to 250 K (φ=35°) at 80°N in northern summer, and from 220 K (φ=15°) to 270 K (φ=35°) at 80°S in southern summer. In the atmosphere at 1 km above ground, the respective range is 195–225 K in northern summer, and 210–250 K in southern summer.
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Greve Ralf

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