Planet-wide sand motion on Mars

被引：130

作者：

Bridges, Nathan T. ^{[1
]}

Bourke, Mary C. ^{[2
]}

Geissler, Paul E. ^{[3
]}

Banks, Maria E. ^{[4
]}

Colon, Cindy ^{[5
]}

Diniega, Serina ^{[6
]}

Golombek, Matthew P. ^{[6
]}

Hansen, Candice J. ^{[2
]}

Mattson, Sarah ^{[7
]}

McEwen, Alfred S. ^{[7
]}

Mellon, Michael T. ^{[8
]}

Stantzos, Nicholas ^{[3
]}

Thomson, Bradley J. ^{[1
]}

机构：

[1] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA

[2] Planetary Sci Inst, Tucson, AZ 85719 USA

[3] US Geol Survey, Flagstaff, AZ 86001 USA

[4] Smithsonian Air & Space Museum, Ctr Earth & Planetary Studies, Washington, DC 20013 USA

[5] Rutgers State Univ, Dept Earth & Environm Sci, Newark, NJ 07102 USA

[6] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[7] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

[8] Univ Colorado, Atmospher & Space Phys Lab, Boulder, CO 80309 USA

来源：

GEOLOGY | 2012年 / 40卷 / 01期

基金：

美国国家航空航天局;

关键词：

GENERAL-CIRCULATION MODEL; DUNES; MOVEMENT; DEPOSITS; EROSION; VALLEY; ICE;

D O I：

10.1130/G32373.1

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Prior to Mars Reconnaissance Orbiter data, images of Mars showed no direct evidence for dune and ripple motion. This was consistent with climate models and lander measurements indicating that winds of sufficient intensity to mobilize sand were rare in the low-density atmosphere. We show that many sand ripples and dunes across Mars exhibit movement of as much as a few meters per year, demonstrating that Martian sand migrates under current conditions in diverse areas of the planet. Most motion is probably driven by wind gusts that are not resolved in global circulation models. A past climate with a thicker atmosphere is only required to move large ripples that contain coarse grains.

引用

页码：31 / 34

页数：4

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