An Extensive Phase Space for the Potential Martian Biosphere

被引：46

作者：

Jones, Eriita G. ^{[1
,2
]}

Lineweaver, Charles H. ^{[1
,2
]}

Clarke, Jonathan D. ^{[3
]}

机构：

[1] Australian Natl Univ, Res Sch Astron & Astrophys, Planetary Sci Inst, Canberra, ACT, Australia

[2] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia

[3] Mars Soc Australia Inc, Canberra, ACT, Australia

来源：

ASTROBIOLOGY | 2011年 / 11卷 / 10期

关键词：

Biosphere; Mars; Limits of life; Extremophiles; Water; MARS GLOBAL SURVEYOR; HOMOGENEOUS ICE NUCLEATION; LIQUID WATER; INTERIOR STRUCTURE; ATMOSPHERIC TEMPERATURES; SHALLOW SUBSURFACE; CONTINENTAL-CRUST; THERMAL EVOLUTION; MICROBIAL LIFE; GROUND-ICE;

D O I：

10.1089/ast.2011.0660

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a comprehensive model of martian pressure-temperature (P-T) phase space and compare it with that of Earth. Martian P-T conditions compatible with liquid water extend to a depth of similar to 310 km. We use our phase space model of Mars and of terrestrial life to estimate the depths and extent of the water on Mars that is habitable for terrestrial life. We find an extensive overlap between inhabited terrestrial phase space and martian phase space. The lower martian surface temperatures and shallower martian geotherm suggest that, if there is a hot deep biosphere on Mars, it could extend 7 times deeper than the similar to 5 km depth of the hot deep terrestrial biosphere in the crust inhabited by hyperthermophilic chemolithotrophs. This corresponds to similar to 3.2% of the volume of present-day Mars being potentially habitable for terrestrial-like life.

引用

页码：1017 / 1033

页数：17

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