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A multi-model intercomparison of halogenated very short-lived substances (TransCom-VSLS): Linking oceanic emissions and tropospheric transport for a reconciled estimate of the stratospheric source gas injection of bromine

Hossaini, R.; Patra, P.K.; Leeson, A.A.; Krysztofiak, G.; Abraham, N.L.; Andrews, S.J.; Archibald, A.T.; Aschmann, J.; Atlas, E.L.; Belikov, D.A.; Bönisch, H.; Carpenter, L.J.; Dhomse, S.; Dorf, M.; Engel, A.; Feng, W.; Fuhlbrügge, S.; Griffiths, P.T.; Harris, N.R.P.; Hommel, R.; ... mehr

Abstract:
The first concerted multi-model intercomparison of halogenated very short-lived substances (VSLS) has been performed, within the framework of the ongoing Atmospheric Tracer Transport Model Intercomparison Project (TransCom). Eleven global models or model variants participated (nine chemical transport models and two chemistry– climate models) by simulating the major natural bromine VSLS, bromoform (CHBr$_{3}$) and dibromomethane (CH$_{2}$Br$_{2}$), over a 20-year period (1993–2012). Except for three model simulations, all others were driven offline by (or nudged to) reanalysed meteorology. The overarching goal of TransCom- VSLS was to provide a reconciled model estimate of the stratospheric source gas injection (SGI) of bromine from these gases, to constrain the current measurement-derived range, and to investigate inter-model differences due to emissions and transport processes. Models ran with standardised idealised chemistry, to isolate differences due to transport, and we investigated the sensitivity of results to a range of VSLS emission inventories. Models were tested in their ability to reproduce the observed seasonal and spatial distribution of VSLS at the surface, using measurements from NOAA’s long-term global monitoring network, and in the tropical troposphere, using recent aircraft measurements – including high-altitude observations from the NASA Global Hawk platform.
The models generally capture the observed seasonal cycle of surface CHBr$_{3}$ and CH$_{2}$Br$_{2}$ well, with a strong model– measurement correlation (r ≥ 0.7) at most sites. ... mehr

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Volltext §
DOI: 10.5445/IR/1000058680
Originalveröffentlichung
DOI: 10.5194/acp-16-9163-2016
Scopus
Zitationen: 19
Web of Science
Zitationen: 20
Coverbild
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator ISSN: 1680-7316, 1680-7324
urn:nbn:de:swb:90-586803
KITopen-ID: 1000058680
HGF-Programm 12.04.03 (POF III, LK 01)
Erschienen in Atmospheric chemistry and physics
Band 16
Heft 14
Seiten 9163-9187
Nachgewiesen in Web of Science
Scopus
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