Oceanic distributions and air-sea fluxes of biogenic halocarbons in the open ocean

Chuck, Adele L., Turner, Suzanne M. and Liss, Peter S. (2005) Oceanic distributions and air-sea fluxes of biogenic halocarbons in the open ocean. Journal of Geophysical Research, 110 (C10). ISSN 0148-0227

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Surface seawater and atmospheric concentrations of methyl iodide, chloroiodomethane, bromoform, dichlorobromomethane, and chlorodibromethane were measured during three open ocean cruises in the Atlantic and Southern oceans. The measurements spanned a longitudinal range of 115°, between 50°N and 65°S. The saturation anomalies and the instantaneous air-sea fluxes of the gases during one of these cruises (ANT XVIII/1) are presented and discussed. Methyl iodide and chloroiodomethane were highly supersaturated (>1000%) throughout the temperate and tropical regions, with calculated mean fluxes of 15 and 5.5 nmol m-2 d-1, respectively. The oceanic emissions of the brominated compounds were less substantial, and a significant area of the temperate Atlantic Ocean was found to be a sink for bromoform. Correlation analyses have been used to investigate possible controls on the concentrations of these gases. In particular, the relationship of CH3I with sea surface temperature and light is discussed, with the tentative conclusion that this compound may be formed abiotically.

Item Type: Article
Faculty \ School:
Faculty of Science > School of Environmental Sciences
Depositing User: Rosie Cullington
Date Deposited: 16 Jun 2011 08:25
Last Modified: 28 Feb 2023 17:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/32697
DOI: 10.1029/2004JC002741

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