Atmos. Chem. Phys. Discuss., 8, 18409-18435, 2008
www.atmos-chem-phys-discuss.net/8/18409/2008/
doi:10.5194/acpd-8-18409-2008
© Author(s) 2008. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean
L. J. Carpenter1, C. E. Jones1, R. M. Dunk1,*, and K. E. Hornsby1
1Department of Chemistry, University of York, York, YO10 5DD, UK
*now at: Crichton Carbon Centre, Crichton University Campus, Dumfries, DG1 4ZL, UK

Abstract. Air-sea fluxes and bulk seawater and atmospheric concentrations of bromoform (CHBr3) and dibromomethane (CH2Br2) were measured during two research cruises in the northeast Atlantic (53–59° N, June–July 2006) and tropical eastern Atlantic Ocean including over the African coastal upwelling system (16–35° N May–June 2007). Saturations and sea-air fluxes of these compounds generally decrease in the order coastal>upwelling>shelf>open ocean, and a broad trend of elevated surface seawater concentrations with high chlorophylla was observed. From limited data from eastern Atlantic coastlines, we tentatively suggest that globally, coastal and coastally-influenced waters together contribute ~2.4 Gmol Br yr−1 (24–56%) of CHBr3. We show that upwelling regions (coastal and equatorial) represent regional hot spots of bromocarbons, but are probably not of major significance globally, contributing only a few percent of the total global emissions of CHBr3 and CH2Br2. We also show that the concentration ratio of CH2Br2/CHBr3 in seawater is a strong function of concentration (and location), with a lower CH2Br2/CHBr3 ratio found in coastal regions near to macroalgal sources.

Citation: Carpenter, L. J., Jones, C. E., Dunk, R. M., and Hornsby, K. E.: Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean, Atmos. Chem. Phys. Discuss., 8, 18409-18435, doi:10.5194/acpd-8-18409-2008, 2008.
 
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