English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/139817
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Title

Global impacts of tropospheric halogens (Cl, Br, I) on oxidants and composition in GEOS-Chem

AuthorsSherwen, T.; Schmidt, J.A.; Evans, M.J.; Carpenter, L.J.; Großmann, K.; Eastham, S.D.; Jacob, D.J.; Dix, B.; Koenig, T.K.; Sinreich, R.; Ortega, I.; Volkamer, R.; Saiz-Lopez, A. ; Prados-Roman, C.; Mahajan, A.S.; Ordóñez, C.
Issue Date2016
PublisherEuropean Geophysical Society
CitationAtmospheric Chemistry and Physics 16: 12239- 12271 (2016)
AbstractWe present a simulation of the global present-day composition of the troposphere which includes the chemistry of halogens (Cl, Br, I). Building on previous work within the GEOS-Chem model we include emissions of inorganic iodine from the oceans, anthropogenic and biogenic sources of halogenated gases, gas phase chemistry, and a parameterised approach to heterogeneous halogen chemistry. Consistent with Schmidt et al. (2016) we do not include sea-salt debromination. Observations of halogen radicals (BrO, IO) are sparse but the model has some skill in reproducing these. Modelled IO shows both high and low biases when compared to different datasets, but BrO concentrations appear to be modelled low. Comparisons to the very sparse observations dataset of reactive Cl species suggest the model represents a lower limit of the impacts of these species, likely due to underestimates in emissions and therefore burdens. Inclusion of Cl, Br, and I results in a general improvement in simulation of ozone (O3) concentrations, except in polar regions where the model now underestimates O3 concentrations. Halogen chemistry reduces the global tropospheric O3 burden by 18.6ĝ€%, with the O3 lifetime reducing from 26 to 22 days. Global mean OH concentrations of 1.28ĝ€ × ĝ€106ĝ€moleculesĝ€cmĝ'3 are 8.2ĝ€% lower than in a simulation without halogens, leading to an increase in the CH4 lifetime (10.8ĝ€%) due to OH oxidation from 7.47 to 8.28 years. Oxidation of CH4 by Cl is small (ĝ1/4 ĝ€2ĝ€%) but Cl oxidation of other VOCs (ethane, acetone, and propane) can be significant (ĝ1/4 ĝ€15-27ĝ€%). Oxidation of VOCs by Br is smaller, representing 3.9ĝ€% of the loss of acetaldehyde and 0.9ĝ€% of the loss of formaldehyde.
URIhttp://hdl.handle.net/10261/139817
DOI10.5194/acp-16-12239-2016
Identifiersdoi: 10.5194/acp-16-12239-2016
issn: 1680-7324
Appears in Collections:(IQFR) Artículos
Files in This Item:
File Description SizeFormat 
acp-16-12239-2016.pdf5,72 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.