Determination of coastal and oceanic sinks and sources for reactive
trace gases by isotope studies
The subproject is dedicated to two main
objectives: (i) to generate a revised global estimate of coastal halocarbon
emissions accounting for those from seagrass meadows and (ii) to provide
comprehensive isotopic data sets for the coastal and oceanic sinks and sources
of selected halocarbons (CH3Cl, CH3Br, CH3I
and CHBr3) using different upscaling and model approaches. In
particular the formation and degradation of the monohalomethanes with large
fractionation factors are assigned. The δ13C values of these
compounds vary sensitively between sources and sinks making them a valuable
tool to assess the current state and future changes in the marine and
atmospheric environment.
Fig.1: Sampling of volatile
halocarbon emissions in a seagrass meadow by a dynamic flux chamber.Fig.2: Purge & tarp
measurements of dissolved halocarbons on board FS METEOR
PI: R. Seifert Contact: Richard Seifert (richard.seifert@zmaw.de)
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