Dune formation on the present Mars

被引：58

作者：

Parteli, Eric J. R. ^{[1
,2
]}

Herrmann, Hans J. ^{[2
,3
]}

机构：

[1] Univ Stuttgart, Inst Computerphys, ICP, D-70569 Stuttgart, Germany

[2] Univ Fed do Ceara, Dept Fis, BR-60455760 Fortaleza, Ceara, Brazil

[3] ETH Honggerberg, IFB, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW E | 2007年 / 76卷 / 04期

关键词：

D O I：

10.1103/PhysRevE.76.041307

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We apply a model for sand dunes to calculate formation of dunes on Mars under the present Martian atmospheric conditions. We find that different dune shapes as those imaged by Mars Global Surveyor could have been formed by the action of sand-moving winds occuring on today's Mars. Our calculations show, however, that Martian dunes could be only formed due to the higher efficiency of Martian winds in carrying grains into saltation. The model equations are solved to study saltation transport under different atmospheric conditions valid for Mars. We obtain an estimate for the wind speed and migration velocity of barchan dunes at different places on Mars. From comparison with the shape of bimodal sand dunes, we find an estimate for the time scale of the changes in Martian wind regimes.

引用

页数：16

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