Atmospheric constraints on global emissions of methane from plants

Details Atmospheric constraints on global emissions of methane from plants Atmospheric constraints on global emissions of methane from plants

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3315821h&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 15, CiteID L15821

Physics

26

Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions (0426, 1610), Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Biogeosciences: Biogeochemical Cycles, Processes, And Modeling (0412, 0793, 1615, 4805, 4912)

Scientific paper

We investigate whether a recently proposed large source of CH4 from vegetation can be reconciled with atmospheric measurements. Atmospheric transport model simulations with and without vegetation emissions are compared with background CH4, δ13C-CH4 and satellite measurements. For present-day CH4 we derive an upper limit to the newly discovered source of 125 Tg CH4 yr-1. Analysis of preindustrial CH4, however, points to 85 Tg CH4 yr-1 as a more plausible limit. Model calculations with and without vegetation emissions show strikingly similar results at background surface monitoring sites, indicating that these measurements are rather insensitive to CH4 from plants. Simulations with 125 Tg CH4 yr-1 vegetation emissions can explain up to 50% of the previously reported unexpectedly high CH4 column abundances over tropical forests observed by SCIAMACHY. Our results confirm the potential importance of vegetation emissions, and call for further research.

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