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

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 SO4 2 aerosol radiative cooling effect. Citation: Gauci, V., N. Dise, and S. Blake (2005), Long-term suppression of wetland methane flux following a pulse of simulated acid rain, Geophys. Res. Lett., 32, L12804, doi:10.1029/2005GL022544.