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DOI | 10.1038/s41561-018-0243-0 |
O-2 solubility in Martian near-surface environments and implications for aerobic life | |
Stamenkovic, Vlada1,2; Ward, Lewis M.2,3; Mischna, Michael1; Fischer, Woodward W.2 | |
2018-12-01 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:12页码:905-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Due to the scarcity of O-2 in the modern Martian atmosphere, Mars has been assumed to be incapable of producing environments with sufficiently large concentrations of O-2 to support aerobic respiration. Here, we present a thermodynamic framework for the solubility of O-2 in brines under Martian near-surface conditions. We find that modern Mars can support liquid environments with dissolved O-2 values ranging from -2.5 x10(-6) mol m(-3) to 2 mol m(-3) across the planet, with particularly high concentrations in polar regions because of lower temperatures at higher latitudes promoting O-2 entry into brines. General circulation model simulations show that O-2 concentrations in near-surface environments vary both spatially and with time-the latter associated with secular changes in obliquity, or axial tilt. Even at the limits of the uncertainties, our findings suggest that there can be near-surface environments on Mars with sufficient O-2 available for aerobic microbes to breathe. Our findings may help to explain the formation of highly oxidized phases in Martian rocks observed with Mars rovers, and imply that opportunities for aerobic life may exist on modern Mars and on other planetary bodies with sources of O-2 independent of photosynthesis. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000451837900008 |
WOS关键词 | OXYGEN SOLUBILITY ; HEAT-CAPACITIES ; MARS ; TEMPERATURE ; MODEL ; WATER ; EVOLUTION ; ATMOSPHERE ; MANGANESE ; SULFUR |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34663 |
专题 | 地球科学 气候变化 |
作者单位 | 1.CALTECH, Jet Prop Lab, Pasadena, CA 91125 USA; 2.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA; 3.Harvard Univ, Cambridge, MA 02138 USA |
推荐引用方式 GB/T 7714 | Stamenkovic, Vlada,Ward, Lewis M.,Mischna, Michael,et al. O-2 solubility in Martian near-surface environments and implications for aerobic life[J]. NATURE GEOSCIENCE,2018,11(12):905-+. |
APA | Stamenkovic, Vlada,Ward, Lewis M.,Mischna, Michael,&Fischer, Woodward W..(2018).O-2 solubility in Martian near-surface environments and implications for aerobic life.NATURE GEOSCIENCE,11(12),905-+. |
MLA | Stamenkovic, Vlada,et al."O-2 solubility in Martian near-surface environments and implications for aerobic life".NATURE GEOSCIENCE 11.12(2018):905-+. |
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