Grott, M. and Morschhauser, A. and Breuer, D. and Hauber, E. (2011) Volcanic Outgassing of CO2 and H2O on Mars. Earth and Planetary Science Letters, 308 (3-4), pp. 391-400. Elsevier Inc.. DOI: 10.1016/j.epsl.2011.06.014.
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Volcanic outgassing is one of the main sources of volatiles for the martian atmosphere and degassing of the martian interior potentially influenced the early martian climate. Using a parameterized thermo-chemical evolution model and considering two end-member melting models, we self-consistently calculate the amount of CO2 and H2O outgassed during the martian evolution. Outgassing rates are found to depend primarily on a factor describing the outgassing efficiency, the bulk mantle water content, the mantle oxygen fugacity, and the local melt fraction in the magma source regions. We find that significant outgassing ceased around 3.5–2 Gyr ago, depending on the adopted melting model. A total of 0.9–1 bar CO2 is outgassed during this time period if a mantle oxygen fugacity corresponding to one log10 unit above the iron–wustite buffer is assumed. Additionally, a total of 17–61 m of water is delivered to the surface. Outgassing is most efficient in the pre-Noachian (up to 4.1 Gyr), but still significant during the Noachian, and 5–15 m of water and ∼250 mbar of CO2 are outgassed between 4.1 and 3.7 Gyr. Although this amount is probably insufficient for an appreciable greenhouse effect, pressures are found to be sufficient to stabilize transient liquid water on the surface well into the Hesperian period. Therefore, our results support the hypothesis that rather than being warm-and-wet, the martian climate was probably cold-and-wet. Outgassing is found to strongly decline during the Hesperian, and is insignificant during the Amazonian period. A simple parameterization for the outgassing of CO2 and H2O as a function of time is presented.
|Title:||Volcanic Outgassing of CO2 and H2O on Mars|
|Journal or Publication Title:||Earth and Planetary Science Letters|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 391-400|
|Keywords:||Mars; volcanism; outgassing; CO2; water; geophysics|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Space (old)|
|HGF - Program Themes:||W EW - Erforschung des Weltraums|
|DLR - Research area:||Space|
|DLR - Program:||W EW - Erforschung des Weltraums|
|DLR - Research theme (Project):||W - Vorhaben Exploration des Sonnensystems (old)|
|Institutes and Institutions:||Institute of Planetary Research > Planetary Physics|
Institute of Planetary Research
Institute of Planetary Research > Planetary Geology
|Deposited By:||Lena Noack|
|Deposited On:||08 Nov 2011 10:55|
|Last Modified:||26 Mar 2013 13:31|
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