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Modelling marine emissions and atmospheric distributions of halocarbons and dimethyl sulfide: The influence of prescribed water concentration vs. prescribed emissions

Lennartz, S.T.; Krysztofiak, G.; Marandino, C.A.; Sinnhuber, B.-M.; Tegtmeier, S.; Ziska, F.; Hossaini, R.; Krüger, K.; Montzka, S.A.; Atlas, E.; Oram, D.E.; Keber, T.; Bönisch, H.; Quack, B.

Marine-produced short-lived trace gases such as dibromomethane (CH$_{2}$Br$_{2}$), bromoform (CHBr$_{3}$), methyliodide (CH$_{3}$I) and dimethyl sulfide (DMS) significantly impact tropospheric and stratospheric chemistry. Describing their marine emissions in atmospheric chemistry models as accurately as possible is necessary to quantify their impact on ozone depletion and Earth’s radiative budget. So far, marine emissions of trace gases have mainly been prescribed from emission climatologies, thus lacking the interaction between the actual state of the atmosphere and the ocean. Here we present simulations with the chemistry climate model EMAC (ECHAM5/MESSy Atmospheric Chemistry) with online calculation of emissions based on surface water concentrations, in contrast to directly prescribed emissions. Considering the actual state of the model atmosphere results in a concentration gradient consistent with model realtime conditions at the ocean surface and in the atmosphere, which determine the direction and magnitude of the computed flux. This method has a number of conceptual and practical benefits, as the modelled emission can respond consistently to changes in sea surface temperature, surface wind speed, sea ice cover and especially atmospheric mixing ratio. ... mehr

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DOI: 10.5445/IR/1000057997
DOI: 10.5194/acp-15-11753-2015
Zitationen: 17
Web of Science
Zitationen: 18
Cover der Publikation
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 1680-7316, 1680-7324
KITopen-ID: 1000057997
HGF-Programm 12.04.01 (POF III, LK 01) Stratosphere-Troposphere Exchange (STE)
Erschienen in Atmospheric chemistry and physics
Verlag European Geosciences Union (EGU)
Band 15
Heft 20
Seiten 11753-11772
Nachgewiesen in Web of Science
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