Biogenic sources and sinks of bromocarbon in different marine environments

Endres, Sonja, Schiewe, Dörthe, Quack, Birgit, Piontek, Judith, Hepach, Helmke and Engel, Anja (2016) Biogenic sources and sinks of bromocarbon in different marine environments [Poster] In: Ocean Sciences Meeting 2016, 21.-26.02.2016, New Orleans, USA.

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Oceanic bromocarbons are highly reactive volatile organic compounds and may contribute up to 40% of stratospheric ozone depletion in mid latitudes. High sea-air fluxes of bromocarbons in the tropical regions have been related to biological cycling in the surface ocean, mainly to phytoplankton and bacteria, but the underlying processes and magnitude of the biogenic sources and sinks are poorly known. Recently, it has been suggested that reactive halogen species in seawater halogenate dissolved organic matter (DOM) releasing halogenated trace gases. In order to understand temporal and spatial fluctuations of oceanic bromocarbon emissions, we studied microbial production and removal processes in the surface ocean during research cruises in low, temperate and high latitudes. Water samples were incubated with 13C-labelled bromoform (CHBr3) and deuteraded dibromomethane (CD2Br2) substrate to determine bromocarbons consumption rates. 12C/13C-bromocarbon concentrations as well as bacterial abundance and organic matter concentrations were monitored to estimate the microbial activity and turn over. Experimental data are compared to measured depth profiles of microbial biomass, bromocarbon and organic matter concentrations.

Document Type: Conference or Workshop Item (Poster)
Keywords: Halocarbons, microbial cycling, bromoform, DOM
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Kiel University
Date Deposited: 09 Mar 2016 14:06
Last Modified: 09 Mar 2016 14:06

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