Future emissions of marine halogenated very-short lived substances under climate change.

Ziska, Franziska, Quack, Birgit, Tegtmeier, Susann, Stemmler, Irene and Krüger, Kirstin (2017) Future emissions of marine halogenated very-short lived substances under climate change. Journal of Atmospheric Chemistry, 74 (2). pp. 245-260. DOI 10.1007/s10874-016-9355-3.

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Abstract

Halogenated Very Short-lived Substances (VSLS), such as bromoform, dibromomethane and methyl iodide, are naturally produced in the oceans and are involved in ozone depletion in the troposphere and the stratosphere. The effect of climate change on the oceanic emissions of these compounds is not well quantified. Based on present-day observed global oceanic and atmospheric concentrations, and historic and future data from three CMIP5 models, past and future sea-to-air fluxes of these VSLS are calculated. The simulations are used to infer possible effects of projected changes of physical forcing on emissions in different oceanic regimes. CMIP5 model output for 1979–2100 from the historical scenario and the RCP scenarios 2.6 and 8.5 are used as input data for the emission calculations. Of the parameters that have the main influence on the sea-to-air fluxes, the global sea surface temperatures show a steady increase during the twenty-first century, while the projected changes of sea surface wind speed is very small. The calculated emissions based on the historical CMIP5 model runs (1979–2005) increased over the 26 year period and agree well with the emissions based on ERA-Interim data. The future sea-to-air fluxes of VSLS generally increase during the twenty-first century under the assumption of constant concentration fields in the ocean and atmosphere. The multi-model mean global emissions of bromoform increase by 29.4% (9.0%) between 1986 and 2005 and 2081–2100 under RCP 8.5 (2.6) and dibromomethane and methyl iodide emissions increase by 23.3% (6.4%) and 5.5% (1.5%), respectively. Uncertainties of the future emission estimates, driven by ongoing environmental changes such as changing oceanic productivity (not considered in this study) are discussed.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/226224
Keywords: Bromoform; Dibromomethane; MethylIodide; Marine emissions; Future projections; Halogenated VSLS; Halocarbons
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/s10874-016-9355-3
ISSN: 0167-7764
Projects: SHIVA, SOPRAN, ROMIC THREAT
Date Deposited: 09 Jan 2017 10:23
Last Modified: 01 Feb 2019 15:07
URI: http://oceanrep.geomar.de/id/eprint/35512

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