Reappraisal of the fossil methane budget and related emission from geologic sources

Details Reappraisal of the fossil methane budget and related emission from geologic sources Reappraisal of the fossil methane budget and related emission from geologic sources

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3509307e&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 9, CiteID L09307

Physics

Geophysics

13

Biogeosciences: Carbon Cycling (4806), Global Change: Atmosphere (0315, 0325), Marine Geology And Geophysics: Gas And Hydrate Systems, Global Change: Land/Atmosphere Interactions (1218, 1843, 3322), Atmospheric Composition And Structure: Geochemical Cycles (1030)

Scientific paper

Converging evidence from new top-down and bottom-up estimates of fossil ``radiocarbon-free'' methane emissions indicates that natural geologic sources account for a substantial component of the atmospheric methane budget. Comparing emission estimates based on atmospheric 14CH4 (``radiomethane'') with geologic emissions from seepage, including terrestrial macroseeps, microseepage, marine seeps, and geothermal/volcanic emissions from the Earth's crust, shows that such ``geo-CH4'' sources can be conservatively estimated at 53 +/- 11 Tg yr-1 globally. This makes geo-CH4 second in importance to wetlands as a natural methane source. Such a new appraisal can easily be accommodated within the uncertainty of the global methane budget as recently compiled, and recognizes the importance of geophysical out-gassing of methane generated within the lithosphere. We propose a new coherent contemporary budget in which 30 +/- 5% (based on atmospheric radiomethane measurements) of the global source of 582 +/- 87 Tg yr-1 has fossil origin, both natural and anthropogenic.

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