Atmos. Chem. Phys. Discuss., 12, 21923-21945, 2012
www.atmos-chem-phys-discuss.net/12/21923/2012/
doi:10.5194/acpd-12-21923-2012
© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 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.
Impact of very short-lived halogens on stratospheric ozone abundance and UV radiation in a geo-engineered atmosphere
S. Tilmes1, D. E. Kinnison1, R. R. Garcia1, R. Salawitch2, T. Canty2, J. Lee-Taylor1, S. Madronich1, and K. Chance3
1National Center for Atmospheric Research, Boulder, CO, USA
2University of Maryland College Park, MD, USA
3Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA

Abstract. The impact of very short-lived (VSL) halogenated source species on the ozone layer and surface erythemal ultraviolet radiation (UVERY) is investigated in the context of geo-engineering of climate by stratospheric sulfur injection. For a projected 2040 model atmosphere, consideration of VSL halogens at their upper limit results in lower ozone columns and higher UVERY due to geo-engineering for nearly all seasons and latitudes, with UVERY rising by 12% and 6% in southern and northern high latitudes, respectively. When VSL halogen sources are neglected, future UVERY increases due to declines in ozone column are nearly balanced by reductions of UVERY due to scattering by the higher stratospheric aerosol burden in mid-latitudes. Consideration of VSL sources at their upper limit tips the balance, resulting in annual average increases in UVERY of up to 5% in mid and high latitudes. Therefore, VSL halogens should be considered in models that assess the impact of stratospheric sulfur injections on the ozone layer.

Citation: Tilmes, S., Kinnison, D. E., Garcia, R. R., Salawitch, R., Canty, T., Lee-Taylor, J., Madronich, S., and Chance, K.: Impact of very short-lived halogens on stratospheric ozone abundance and UV radiation in a geo-engineered atmosphere, Atmos. Chem. Phys. Discuss., 12, 21923-21945, doi:10.5194/acpd-12-21923-2012, 2012.
 
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