On temperate sources of bromoform and other reactive organic bromine gases

Carpenter, LJ and Liss, PS (2000) On temperate sources of bromoform and other reactive organic bromine gases. Journal of Geophysical Research, 105 (D16). pp. 20539-20547. ISSN 0148-0227

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Abstract

Current estimates of annual bromoform production by temperate marine algae underestimate, by at least an order of magnitude, the flux required to sustain atmospheric concentrations. In the light of recent evidence of the potential of bromoform to deplete upper-tropospheric/lower-stratospheric ozone, such a substantial discrepancy in global emission rates is of considerable concern. Here we present new information on air and seawater CHBr3, CH2Br2, and CHBr2Cl concentrations in the coastal east Atlantic and review previous data from widespread locations which suggest that concentrations and ratios of reactive organobromines are consistent with marine macroalgal emissions. Detailed reviews of algal halocarbon emissions and biomass estimates imply that macroalgae produce around 70% of the world's bromoform, rather than only ~ 20% as previously thought, and that the underestimation was most likely caused by over conservative biomass estimates. Our total global source strength estimate of 2.2 x 1011 g CHBr3 yr-1 agrees well with recent calculations derived from atmospheric data. Given the dominant role of macroalgae in producing bromoform, the effect of changing climate and environment on seaweed populations and consequent effect on biogenic bromine emissions should be investigated.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: Rosie Cullington
Date Deposited: 16 Jun 2011 09:00
Last Modified: 21 Apr 2020 21:13
URI: https://ueaeprints.uea.ac.uk/id/eprint/32710
DOI: 10.1029/2000JD900242

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