Atmos. Chem. Phys. Discuss., 4, 5367-5380, 2004
www.atmos-chem-phys-discuss.net/4/5367/2004/
doi:10.5194/acpd-4-5367-2004
© Author(s) 2004. This work is licensed under the
Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Halogens and the chemistry of the free troposphere
D. J. Lary
1Global Modelling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, MD, USA
2GEST at the University of Maryland Baltimore County, Baltimore, MD, USA
3Unilever Cambridge Centre, Dep. of Chemistry, University of Cambridge, Cambridge, UK

Abstract. The role of halogens in both the marine boundary layer and the stratosphere has long been recognized, while their role in the free troposphere is often not considered in global chemical models. However, a careful examination of free-tropospheric chemistry constrained by observations using a full chemical data assimilation system shows that halogens do play a significant role in the free troposphere. In particular, the chlorine initiation of methane oxidation in the free troposphere can contribute more than 10%, and in some regions up to 50%, of the total rate of initiation. The initiation of methane oxidation by chlorine is particularly important below the polar vortex and in northern mid-latitudes. Likewise, the hydrolysis of alone can contribute more than 35% of the production rate in the free-troposphere.

Citation: Lary, D. J.: Halogens and the chemistry of the free troposphere, Atmos. Chem. Phys. Discuss., 4, 5367-5380, doi:10.5194/acpd-4-5367-2004, 2004.
 
Search ACPD
Discussion Paper
    XML
    Citation
    Final Revised Paper
    Share