Impact of BrO on dimethylsulfide in the remote marine boundary layer

Details Impact of BrO on dimethylsulfide in the remote marine boundary layer Impact of BrO on dimethylsulfide in the remote marine boundary layer

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3702807b&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 2, CiteID L02807

Physics

10

Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Composition And Structure: Troposphere: Constituent Transport And Chemistry, Global Change: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912), Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504), Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906)

Scientific paper

We have used a global three-dimensional chemical transport model coupled to a detailed size-resolved aerosol microphysics module to study the impact of BrO on dimethylsulfide (DMS) in the remote marine boundary layer. Our model results suggest BrO contributes 16% of the global annual DMS oxidation sink. This effect is most profound over the SH oceans where low NOx concentrations and a high sea salt aerosol source, coupled with high DMS concentrations, drives a large contribution of BrO to DMS oxidation (>20%). Bromine chemistry also results in an 18% reduction in the global DMS burden and lifetime. In addition, when we use an alternative DMS source parameterization resulting in a factor 2 increase in DMS flux the release of bromine from sea salt aerosol increases by 50-60% in the southern hemisphere summer because of additional aerosol acidity. This suggests a possible DMS-SO2-sea salt-BrO marine aerosol feedback mechanism that acts to reduce the sensitivity of the DMS lifetime to increases in DMS emission.

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