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Sökning: onr:"swepub:oai:DiVA.org:ltu-3272" > Transient liquid wa...

Transient liquid water and water activity at Gale crater on Mars

Martin-Torres, Javier (författare)
Luleå tekniska universitet,Rymdteknik
Zorzano, María-Paz (författare)
Centro de Astrobiologia, INTA-CSIC, Madrid , Instituto Nacional de Técnica Aeroespacial, Madrid, Centro de Astrobiologia, Madrid
Valentin-Serrano, Patricia (författare)
CSIC-UGR - Instituto Andaluz de Ciencias de la Tierra (IACT), Granada
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Harri, Ari-Matti (författare)
Earth Observation Research Division, Finnish Meteorological Institute, Helsinki
Genzer, Maria (författare)
Finnish Meteorological Institute, Earth Observation Research Division, Finnish Meteorological Institute, Helsinki
Kemppainen, Osku (författare)
Finnish Meteorological Institute, Earth Observation Research Division, Finnish Meteorological Institute, Helsinki
Rivera-Valentin, Edgard G. (författare)
Arecibo Observatory, Universities Space Research Association, Arecibo, Puerto Rico
Jun, Insoo (författare)
California Institute of Technology, Jet Propulsion Laboratory
Wray, James J. (författare)
School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta
Madsen, Morten B. (författare)
Niels Bohr Institute, University of Copenhagen
Goetz, Walter (författare)
Max-Planck-Institut für Solar System Research
McEwen, Alfred S, (författare)
Lunar and Planetary Lab, University of Arizona, Tucson
Hardgrove, Craig (författare)
Arizona State University, Department of Earth & Planetary Sciences, University of Tennessee, Knoxville, Malin Space Science Systems
Renno, Nilton (författare)
University of Michigan, College of Engineering, University of Michigan, Ann Arbor
Chevrier, Vincent F. (författare)
Arkansas Center for Space and Planetary Sciences, University of Arkansas, Fayetteville
Mischna, Michael A. (författare)
Jet Propulsion Laboratory, California Institute of Technology, Pasadena
Navarro-Gonzalez, Rafael (författare)
Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de Mexico, Ciudad Universitaria, Centro de Astrobiologia, INTA-CSIC, Madrid , Universidad Nacional Autónoma de México, Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico D.F., Laboratorio de Química de Plasmas y Estudios Planetarios, Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México
Martínez-Frías, Jesús (författare)
Centro de Astrobiologia, INTA-CSIC, Madrid , Instituto de Geociencias (CSIC-UCM), 28040 Madrid
Conrad, Pamela G. (författare)
NASA Goddard Space Flight Center, Solar System Exploration Division, Goddard Space Flight Center, National Aeronautics and Space Administration, Greenbelt, Maryland
McConnochie, Timothy H. (författare)
Department of Astronomy, University of Maryland, College Park
Cockell, Charles (författare)
ESO, UK Centre for Astrobiology, School of Physics and Astronomy,
Berger, Gilles (författare)
IRAP/CNRS, Institut de Recherche en Astrophysique et Planetologie, Toulouse, Université de Toulouse, UPS-OMP, IRAP
Vasavada, Ashwin (författare)
Jet Propulsion Laboratory, California Institute of Technology, Pasadena
Sumner, Dawn Y. (författare)
Department of Earth and Planetary Sciences, University of California, Davis, Department of Geology, University of California, Davis
Vaniman, David T. (författare)
Planetary Science Institute, Tucson
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 (creator_code:org_t)
2015
2015
Engelska.
Ingår i: Nature Geoscience. - 1752-0894 .- 1752-0908. ; 8:5, s. 357-361
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Water is a requirement for life as we know it1. Indirect evidence of transient liquid water has been observed from orbiter on equatorial Mars2, 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 rover3, 4, lowers the freezing temperature of water5. Moreover, perchlorates can form stable hydrated compounds and liquid solutions by absorbing atmospheric water vapour through deliquescence6, 7. 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 organisms8. Perchlorates are widespread on the surface of Mars9 and we expect that liquid brines are abundant beyond equatorial regions where atmospheric humidity is higher and temperatures are lower.

Ämnesord

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Aerospace Engineering (hsv//eng)
TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Rymd- och flygteknik (hsv//swe)
TEKNIK OCH TEKNOLOGIER  -- Maskinteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering (hsv//eng)

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Atmospheric science
Atmosfärsvetenskap

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