Air-sea fluxes of biogenic bromine from the tropical and North Atlantic Ocean
Author:
Carpenter L. J.,Jones C. E.,Dunk R. M.,Hornsby K. E.
Abstract
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.
Publisher
Copernicus GmbH
Reference41 articles.
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