Methyl chloride and isoprene emissions from tropical rain forest in Southeast Asia

Details Methyl chloride and isoprene emissions from tropical rain forest in Southeast Asia Methyl chloride and isoprene emissions from tropical rain forest in Southeast Asia

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3519812s&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 19, CiteID L19812

Physics

5

Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions (0426, 1610), Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Biogeosciences: Isotopic Composition And Chemistry (1041, 4870), Biogeosciences: Plant Ecology (1851), Atmospheric Composition And Structure: Geochemical Cycles (1030)

Scientific paper

Methyl chloride (CH3Cl) fluxes were investigated at leaf and forest-canopy scales in tropical forests in Malaysia. Screening of CH3Cl-emitting species showed that 21% of 117 tree species were CH3Cl emitters; the percentage was markedly higher for dipterocarps (66%) than non-dipterocarps (6%). The dipterocarp-derived CH3Cl was characterized by high emissions (median: 0.03 μg g-1 h-1) and low stable carbon isotope ratios (mean: -88.9 +/- 11.0‰). Measurements of CH3Cl above the canopy showed a slight decrease in the mixing ratios with increasing height. These values were used to estimate the canopy-scale flux of about 14 μg m-2 h-1, comparable to that extrapolated from the leaf-scale emissions. Using the canopy-scale flux, global CH3Cl emission by tropical forests was estimated to be 1.3 Tg yr-1, representing approximately 30% of the global emissions. Above-canopy measurements were also made for isoprene, with a mean flux of 1.2 mg m-2 h-1.

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