Long-term suppression of wetland methane flux following a pulse of simulated acid rain

Details Long-term suppression of wetland methane flux following a pulse of simulated acid rain Long-term suppression of wetland methane flux following a pulse of simulated acid rain

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3212804g&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 12, CiteID L12804

Physics

4

Biogeosciences: Biogeochemical Cycles, Processes, And Modeling (0412, 0793, 1615, 4805, 4912), Biogeosciences: Biosphere/Atmosphere Interactions (0315), Biogeosciences: Sulfur Cycling, Biogeosciences: Wetlands (1890), Global Change: Abrupt/Rapid Climate Change (4901, 8408)

Scientific paper

Wetlands are a potent source of the radiatively important gas methane (CH4). Recent findings have demonstrated that sulfate (SO42-) deposition via acid rain suppresses CH4 emissions by stimulating competitive exclusion of methanogens by sulfate-reducing microbial populations. Here we report data from a field experiment showing that a finite pulse of simulated acid rain SO42- deposition, as would be expected from a large Icelandic volcanic eruption, continues to suppress CH4 emissions from wetlands long after the pollution event has ceased. Our analysis of the stoichiometries suggests that 5 years is a minimum CH4 emission recovery period, with 10 years being a reasonable upper limit. Our findings highlight the long-term impact of acid rain on biospheric output of CH4 which, for discrete polluting events such as volcanic eruptions, outlives the relatively short-term SO42- aerosol radiative cooling effect.

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