Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Transient liquid water and water activity at Gale crater on Mars
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik.ORCID-id: 0000-0001-6479-2236
Centro de Astrobiologia, INTA-CSIC, Madrid , Instituto Nacional de Técnica Aeroespacial, Madrid, Centro de Astrobiologia, Madrid.ORCID-id: 0000-0002-4492-9650
CSIC-UGR - Instituto Andaluz de Ciencias de la Tierra (IACT), Granada.
Earth Observation Research Division, Finnish Meteorological Institute, Helsinki.
Visa övriga samt affilieringar
2015 (Engelska)Ingår i: Nature Geoscience, ISSN 1752-0894, E-ISSN 1752-0908, Vol. 8, nr 5, s. 357-361Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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.

Ort, förlag, år, upplaga, sidor
2015. Vol. 8, nr 5, s. 357-361
Nationell ämneskategori
Rymd- och flygteknik
Forskningsämne
Atmosfärsvetenskap
Identifikatorer
URN: urn:nbn:se:ltu:diva-3272DOI: 10.1038/ngeo2412ISI: 000353640100011Scopus ID: 2-s2.0-84927943626Lokalt ID: 114dc9d9-a8f6-4231-91de-334735aa7c61OAI: oai:DiVA.org:ltu-3272DiVA, id: diva2:976128
Anmärkning

Validerad; 2015; Nivå 2; 20150428 (javmar)

Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltextScopus

Personposter BETA

Martin-Torres, JavierZorzano, María-Paz

Sök vidare i DiVA

Av författaren/redaktören
Martin-Torres, JavierZorzano, María-Paz
Av organisationen
Rymdteknik
I samma tidskrift
Nature Geoscience
Rymd- och flygteknik

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 190 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf