Distribution of Mid-Latitude Ground Ice on Mars from New Impact Craters

被引：237

作者：

Byrne, Shane ^{[1
]}

Dundas, Colin M. ^{[1
]}

Kennedy, Megan R. ^{[2
]}

Mellon, Michael T. ^{[3
]}

McEwen, Alfred S. ^{[1
]}

Cull, Selby C. ^{[4
]}

Daubar, Ingrid J. ^{[1
]}

Shean, David E. ^{[2
]}

Seelos, Kimberly D. ^{[5
]}

Murchie, Scott L. ^{[5
]}

Cantor, Bruce A. ^{[2
]}

Arvidson, Raymond E. ^{[4
]}

Edgett, Kenneth S. ^{[2
]}

Reufer, Andreas ^{[6
]}

Thomas, Nicolas ^{[6
]}

Harrison, Tanya N. ^{[2
]}

Posiolova, Liliya V. ^{[2
]}

Seelos, Frank P. ^{[5
]}

机构：

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

[2] Malin Space Sci Syst, San Diego, CA 92191 USA

[3] Univ Colorado, Atmospher & Space Phys Lab, Boulder, CO 80303 USA

[4] Washington Univ, Dept Earth & Planetary Sci, St Louis, MO 63130 USA

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

[6] Univ Bern, Inst Phys, Bern, Switzerland

来源：

SCIENCE | 2009年 / 325卷 / 5948期

关键词：

NEAR-SURFACE; STABILITY; DYNAMICS; HYDROGEN; BEHAVIOR; WATER; DUST; H2O;

D O I：

10.1126/science.1175307

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

New impact craters at five sites in the martian mid-latitudes excavated material from depths of decimeters that has a brightness and color indicative of water ice. Near-infrared spectra of the largest example confirm this composition, and repeated imaging showed fading over several months, as expected for sublimating ice. Thermal models of one site show that millimeters of sublimation occurred during this fading period, indicating clean ice rather than ice in soil pores. Our derived ice-table depths are consistent with models using higher long-term average atmospheric water vapor content than present values. Craters at most of these sites may have excavated completely through this clean ice, probing the ice table to previously unsampled depths of meters and revealing substantial heterogeneity in the vertical distribution of the ice itself.

引用

页码：1674 / 1676

页数：3

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