Long-term drying of Mars by sequestration of ocean-scale volumes of water in the crust

doi:10.1126/science.abc7717

GSTDTAP > 气候变化

DOI	10.1126/science.abc7717
	Long-term drying of Mars by sequestration of ocean-scale volumes of water in the crust
	E. L. Scheller; B. L. Ehlmann; Renyu Hu; D. J. Adams; Y. L. Yung
	2021-04-02
发表期刊	Science
出版年	2021
英文摘要	Mars once had oceans of liquid water on its surface but little of that water remains today in the planet's ice caps and atmosphere. This discrepancy is usually interpreted as loss of water to space, supported by the atmospheric deuterium/hydrogen (D/H) ratio, but this has been difficult to reconcile with other constraints. Scheller et al. propose that water could instead have been incorporated into minerals in the planet's crust, which were later buried (see the Perspective by Kurokawa). They simulated the evolution of the D/H ratio and atmospheric loss rates for a range of plausible conditions, finding that 30 to 99% of Mars' initial water was buried in the crust. Science , this issue p. [56][1]; see also p. [27][2] Geological evidence shows that ancient Mars had large volumes of liquid water. Models of past hydrogen escape to space, calibrated with observations of the current escape rate, cannot explain the present-day deuterium-to-hydrogen isotope ratio (D/H). We simulated volcanic degassing, atmospheric escape, and crustal hydration on Mars, incorporating observational constraints from spacecraft, rovers, and meteorites. We found that ancient water volumes equivalent to a 100 to 1500 meter global layer are simultaneously compatible with the geological evidence, loss rate estimates, and D/H measurements. In our model, the volume of water participating in the hydrological cycle decreased by 40 to 95% over the Noachian period (~3.7 billion to 4.1 billion years ago), reaching present-day values by ~3.0 billion years ago. Between 30 and 99% of martian water was sequestered through crustal hydration, demonstrating that irreversible chemical weathering can increase the aridity of terrestrial planets. [1]: /lookup/doi/10.1126/science.abc7717 [2]: /lookup/doi/10.1126/science.abh4469
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/321134
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	E. L. Scheller,B. L. Ehlmann,Renyu Hu,et al. Long-term drying of Mars by sequestration of ocean-scale volumes of water in the crust[J]. Science,2021.
APA	E. L. Scheller,B. L. Ehlmann,Renyu Hu,D. J. Adams,&Y. L. Yung.(2021).Long-term drying of Mars by sequestration of ocean-scale volumes of water in the crust.Science.
MLA	E. L. Scheller,et al."Long-term drying of Mars by sequestration of ocean-scale volumes of water in the crust".Science (2021).