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• W2014690496 abstract "[1] Reanalysis of the Viking Lander results on Mars has suggested a surface reservoir of organic carbon at the ppm level. The size of this putative reservoir could be explained if the source of carbon on Mars is meteoritic in origin and is destroyed primarily by UV irradiation, yielding methane. By combining a numerical UV model for the surface of Mars with published laboratory measurements of organic UV photolysis, the times required to completely convert the carbon within individual particles to methane may be calculated. For interplanetary dust particles (IDPs) initially containing 10 wt% carbon, lifetimes of organics range from 3.9 years for a 0.2 μm diameter particle at equatorial latitudes to 4900 years for a 200 μm diameter particle at polar latitudes, and implies a median time for IDP organics by UV photolysis of 320 years at equatorial latitudes and 1500 years at polar latitudes. Assuming no redistribution of organics over the surface, the IDP organic reservoir at the surface would range from 1.1 × 10−6 kg m−2 at equatorial latitudes to 6.6 × 10−6 kg m−2 at polar latitudes. If accreted carbon is evenly mixed with the soil, up to 3.4 ppm of organic carbon at the VL1 landing site can be explained from a meteoritic origin and up to 4.9 ppm at the VL2 landing site. Derived from the IDP organic reservoir, small fluctuations in methane would exist due to variations in UV irradiation with latitude and LS. Production of methane is expected to range up to 0.35 pptv sol−1." @default.
• W2014690496 created "2016-06-24" @default.
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• W2014690496 date "2012-08-01" @default.
• W2014690496 modified "2023-10-01" @default.
• W2014690496 title "UV degradation of accreted organics on Mars: IDP longevity, surface reservoir of organics, and relevance to the detection of methane in the atmosphere" @default.
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• W2014690496 doi "https://doi.org/10.1029/2012je004060" @default.
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