Global air-sea flux climatology of CHBr3, CHBr2 and CH3I based on in-situ measurements.

Wittke, Franziska and Quack, Birgit (2012) Global air-sea flux climatology of CHBr3, CHBr2 and CH3I based on in-situ measurements. [Poster] In: SOLAS Open Science Conference. , 07. - 10.05.2012, Cle Elum, Washington, USA .

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Abstract

Based on data of the HalOcAt database global surface marine and atmospheric concentration maps of bromoform (CHBr3), dibromomethane (CH2Br2) and methyl iodide (CH3I) are calculated in order to finally derive global air – sea flux estimates from a bottom up approach. The available measurements were interpolated onto a 1°x1° grid, while missing grid values were extrapolated with a simple but realistic model. Two different regression techniques, (‘Robust Fit’ and ‘Ordinary Least Square’) based on the observed latitudinal and longitudinal distribution of CHBr3, were used for filling the gaps. The fluxes show high seasonal variability in the northern and southern hemisphere as well as enhanced values in the tropical region. The fluxes of the brominated compounds exhibit higher values compared to the flux of CH3I. In contrast to recent studies, negative fluxes (into the ocean) occur in each climatology.

Document Type: Conference or Workshop Item (Poster)
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Projects: SOLAS
Date Deposited: 27 Sep 2012 12:10
Last Modified: 27 Sep 2012 12:10
URI: http://oceanrep.geomar.de/id/eprint/15449

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