Sources of short-lived bromocarbons in the Iberian upwelling system.

Raimund, S., Quack, Birgit, Bozec, Y., Vernet, M., Rossi, V., Garçon, V., Morel, Y. and Morin, P. (2011) Sources of short-lived bromocarbons in the Iberian upwelling system. Open Access Biogeosciences (BG), 8 (6). pp. 1551-1464. DOI 10.5194/bg-8-1551-2011.

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Seawater concentrations of the four brominated trace gases dibromomethane (CH2Br2), bromodichloromethane (CHBrCl2), dibromochloromethane (CHBr2Cl) and bromoform (CHBr3) were measured at different depths of the water column in the Iberian upwelling off Portugal during summer 2007. Bromocarbon concentrations showed elevated values in recently upwelled and aged upwelled waters (mean values of 30 pmol L−1 for CHBr3), while values in the open ocean were significantly lower (7.4 pmol L−1 for CHBr3). Correlations with biological variables and marker pigments indicated that phytoplankton could be identified as a weak bromocarbon source in the open ocean. In upwelled water masses along the coast, halocarbons were not correlated to Chl-a, indicating an external source, overlapping the possible internal production by phytoplankton. We showed that the tidal frequency had a significant influence on halocarbon concentrations in the upwelling and we linked those findings to a strong intertidal coastal source, as well as to a transport of those halocarbon enriched coastal waters by westward surface upwelling currents. Coastal sources and transport can be accounted for maximum values of up to 185.1 pmol L−1 CHBr3 in the upwelling.
Comparison with other productive marine areas revealed that the Iberian upwelling had stronger halocarbon sources than the phytoplankton dominated sources in the Mauritanian upwelling. However, the concentrations off the Iberian Peninsula were still much lower than those of coastal macroalgal influenced waters or those of polar regions dominated by cold water adapted diatoms

Document Type: Article
Keywords: Marine chemistry; bromocarbon; Iberian upwelling system
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/bg-8-1551-2011
ISSN: 1726-4170
Projects: Future Ocean
Date Deposited: 08 Dec 2010 13:52
Last Modified: 23 Sep 2019 22:57

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