globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2412
论文题名:
Transient liquid water and water activity at Gale crater on Mars
作者: Javier Martín-Torres F.; Zorzano M.-P.; Valentín-Serrano P.; Harri A.-M.; Genzer M.; Kemppinen O.; Rivera-Valentin E.G.; Jun I.; Wray J.; Bo Madsen M.; Goetz W.; McEwen A.S.; Hardgrove C.; Renno N.; Chevrier V.F.; Mischna M.; Navarro-González R.; Martínez-Frías J.; Conrad P.; McConnochie T.; Cockell C.; Berger G.; Vasavada A.R.; Sumner D.; Vaniman D.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期:5
起始页码: 357
结束页码: 361
语种: 英语
Scopus关键词: air temperature ; brine ; climate modeling ; freezing ; liquid ; Mars ; perchlorate ; relative humidity ; temperature effect ; water
英文摘要: Water is a requirement for life as we know it. Indirect evidence of transient liquid water has been observed from orbiter on equatorial Mars, in contrast with expectations from large-scale climate models. The presence of perchlorate salts, which have been detected at Gale crater on equatorial Mars by the Curiosity rover, lowers the freezing temperature of water. Moreover, perchlorates can form stable hydrated compounds and liquid solutions by absorbing atmospheric water vapour through deliquescence. Here we analyse relative humidity, air temperature and ground temperature data from the Curiosity rover at Gale crater and find that the observations support the formation of night-time transient liquid brines in the uppermost 5 cm of the subsurface that then evaporate after sunrise. We also find that changes in the hydration state of salts within the uppermost 15 cm of the subsurface, as measured by Curiosity, are consistent with an active exchange of water at the atmosphere-soil interface. However, the water activity and temperature are probably too low to support terrestrial organisms. Perchlorates are widespread on the surface of Mars and we expect that liquid brines are abundant beyond equatorial regions where atmospheric humidity is higher and temperatures are lower. © 2015 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106380
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), 18100 Armilla, Granada, Spain; Division of Space Technology, Department of Computer Science Electrical and Space Engineering, Luleå University of Technology, Kiruna, Sweden; Centro de Astrobiología (INTA-CSIC), Torrejón de Ardoz, Madrid, Spain; Earth Observation Research, Finnish Meteorological Institute, Helsinki, Finland; Arecibo Observatory, Universities Space Research Association, Arecibo, Puerto Rico; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; Niels Bohr Institute, University of Copenhagen, Øster Voldgade 5-7, Copenhagen, Denmark; Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, Göttingen, Germany; Lunar and Planetary Lab, University of Arizona, Tucson, AZ, United States; Arizona State University, Tempe, AZ, United States; College of Engineering, University of Michigan, Ann Arbor, MI, United States; Arkansas Center for Space and Planetary Sciences, University of Arkansas, Fayetteville, AR, United States; Laboratorio de Química de Plasmas y Estudios Planetarios, Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico D.F., Mexico; Instituto de Geociencias (CSIC-UCM), Madrid, Spain; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Department of Astronomy, University of Maryland, College Park, MD, United States; UK Centre for Astrobiology, School of Physics and Astronomy, Edinburgh, United Kingdom; IRAP, Université Toulouse, CNRS, 14 avenue Edouard Belin, Toulouse, France; Department of Earth and Planetary Sciences, University of California, Davis, CA, United States; Planetary Science Institute, Tucson, AZ, United States

Recommended Citation:
Javier Martín-Torres F.,Zorzano M.-P.,Valentín-Serrano P.,et al. Transient liquid water and water activity at Gale crater on Mars[J]. Nature Geoscience,2015-01-01,8(5)
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