Water Activity and the Challenge for Life on Early Mars

DSpace/Manakin Repository

Water Activity and the Challenge for Life on Early Mars

Show simple item record

dc.contributor.author Knoll, Andrew
dc.contributor.author Tosca, Nicholas J.
dc.contributor.author McLennan, Scott M.
dc.date.accessioned 2009-05-28T15:54:18Z
dc.date.issued 2008
dc.identifier.citation Tosca, Nicholas J., Andrew. H. Knoll, and Scott M. McLennan. 2008. Water activity and the challenge for life on early Mars. Science 320, no. 5880: 1204-1207. en
dc.identifier.issn 0036-8075 en
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:3007646
dc.description.abstract In situ and orbital exploration of the martian surface has shown that acidic, saline liquid water was intermittently available on ancient Mars. The habitability of these waters depends critically on water activity (<sup>a</sup>H<sub>2</sub>O), a thermodynamic measure of salinity, which, for terrestrial organisms, has sharply defined limits. Using constraints on fluid chemistry and saline mineralogy based on martian data, we calculated the maximum <sup>a</sup>H<sub>2</sub>O for Meridiani Planum and other environments where salts precipitated from martian brines. Our calculations indicate that the salinity of well-documented surface waters often exceeded levels tolerated by known terrestrial organisms. en
dc.description.sponsorship Organismic and Evolutionary Biology en
dc.language.iso en_US en
dc.publisher American Association for the Advancement of Science en
dc.relation.isversionof http://dx.doi.org/10.1126/science.1155432 en
dash.license META_ONLY
dc.title Water Activity and the Challenge for Life on Early Mars en
dc.relation.journal Science en
dash.depositing.author Knoll, Andrew
dash.embargo.until 10000-01-01

Files in this item

Files Size Format View xmlui.dri2xhtml.METS-1.0.item-files-description
Knoll_WaterActivityChallenge.pdf 305.5Kb PDF View/Open

This item appears in the following Collection(s)

  • FAS Scholarly Articles [7594]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

Show simple item record

 
 

Search DASH


Advanced Search
 
 

Submitters