Temporal and spatial variation in methyl bromide flux from a salt marsh

Details Temporal and spatial variation in methyl bromide flux from a salt marsh Temporal and spatial variation in methyl bromide flux from a salt marsh

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3316808d&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 16, CiteID L16808

Physics

4

Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Biogeosciences: Biogeochemical Cycles, Processes, And Modeling (0412, 0793, 1615, 4805, 4912), Biogeosciences: Trace Gases, Global Change: Land/Atmosphere Interactions (1218, 1843, 3322), Atmospheric Processes: Land/Atmosphere Interactions (1218, 1631, 1843)

Scientific paper

Methyl bromide (CH3Br) is a trace gas involved in stratospheric ozone depletion with both anthropogenic and natural sources. Estimates of natural source strengths are highly uncertain. In this study, >320 highly temporally and spatially resolved measurements of CH3Br emissions from a salt marsh in Scotland (56°00'N, 2°35'W) were made during one year using eight static enclosures. Net emissions showed both strong seasonal and diurnal cycles. Day-to-day maxima in emissions were associated with sunny days. Emissions dropped to zero when vegetation was removed. Mean measured CH3Br emission was 350 ng m-2 h-1, but a few ``hot spots'' (measured maximum 4000 ng m-2 h-1) dominated integrated emissions. A crude scale-up of the annual mean emission yields an estimate for global CH3Br emission of ~1 (0.5-3) Gg y-1 (range uses annual mean from lowest and highest emitting enclosures), ~10% the global salt marsh emission regularly quoted in the literature.

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