期刊
SCIENCE
卷 348, 期 6231, 页码 218-221出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa3630
关键词
-
资金
- NASA's Planetary Astronomy Program [08 PAST08 0034, RTOP 344 32 07]
- NASA's Planetary Atmospheres Program [08 PATM08 0031]
- NASA's Astrobiology Program [RTOP 344 53 51]
- NSF Research in Undergraduate Institutions [AST 0805540]
- NASA Keck PI Data Award
We measured maps of atmospheric water (H2O) and its deuterated form (HDO) across the martian globe, showing strong isotopic anomalies and a significant high deuterium/hydrogen (D/H) enrichment indicative of great water loss. The maps sample the evolution of sublimation from the north polar cap, revealing that the released water has a representative D/H value enriched by a factor of about 7 relative to Earth's ocean [Vienna standard mean ocean water (VSMOW)]. Certain basins and orographic depressions show even higher enrichment, whereas high-altitude regions show much lower values (1 to 3 VSMOW). Our atmospheric maps indicate that water ice in the polar reservoirs is enriched in deuterium to at least 8 VSMOW, which would mean that early Mars (4.5 billion years ago) had a global equivalent water layer at least 137 meters deep.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据