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Published byRoss Warner Modified over 9 years ago
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By Matthew Polacek
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Atmospheric CH 4 on Earth Biological sources Methanogens Abiotic sources UV degradation Geothermal Production Etc.,
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Early Measurements Canada-France-Hawaii telescope NASA IRTF PFS MEX TES Indications of global averages and localized plumes of methane
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Plume findings are questionable Variability in measurements Lack of supporting evidence
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Increased accuracy of the TLS at SAM on the Curiosity Rover Two channel tunable laser spectrometer Channel 1, 2.78 microns Channel 2, 3.27 microns
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Note: 1-sol=24 hours 37.5 minutes Data from 605 sols 11 direct ingest measurements and 2 methane enrichment experiments Three groups Low-methane direct ingest Low-methane enrichment runs High-methane direct ingest
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Exogenous organics IDP and comets Modeling UV/CH 4 conversion rate 2.2 ppbv model vs..7 ppbv actual High-methane results No quantitative correlation
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Mars methane detection and variability at Gale crater Christopher R. Webster et al. Science 347, 415 (2015); DOI: 10.1126/science.1261713
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