Physics
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3215801l&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 15, CiteID L15801
Physics
3
Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions (0426, 1610), Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Troposphere: Composition And Chemistry
Scientific paper
We present new modeled estimates of global methyl halide emissions from rice cultivation. We extrapolate existing data on rice behavior, including temperature, seasonality and soil moisture effects, to the global scale and on a monthly basis. Our best estimates are 2.4 to 4.9 Gg yr-1 for methyl chloride, 0.5 to 0.9 Gg yr-1 for methyl bromide, and 16 to 29 Gg yr-1 for methyl iodide, with additional uncertainty ranges of +/-73%, +/-87% and +/-75%, respectively. Our central range of estimates reflects the greatest remaining model uncertainty, emission response to soil halide concentrations. We find that peak emissions of methyl halides, especially methyl iodide, are sharply defined in regional and temporal extent. Ambient temperature strongly influences rice emissions of methyl bromide and methyl iodide, which rise by ~10% for an increase of 1°C.
Lee-Taylor J.
Redeker K. R.
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