Atmos. Chem. Phys. Discuss., 12, 15083-15113, 2012
www.atmos-chem-phys-discuss.net/12/15083/2012/
doi:10.5194/acpd-12-15083-2012
© 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.
Influence of transport and mixing in autumn on stratospheric ozone variability over the Arctic in early winter
D. Blessmann, I. Wohltmann, and M. Rex
Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany

Abstract. Early winter ozone mixing ratios in the Arctic middle stratosphere show a fair amount of interannual variability. We show that ozone variability in early January is caused by dynamical processes during Arctic polar vortex formation in autumn (September to December). Observational data from satellites and ozone sondes are used in conjunction with simulations of the Chemistry and Transport Model ATLAS to examine the relationship between the meridional and vertical origin of air enclosed in the polar vortex and its ozone amount. For this, we use a set of artificial model tracers to deduce the origin of the air masses in the vortex in January in latitude and altitude in September. High vortex mean ozone mixing ratios are related to a high fraction of air from low latitudes enclosed in the vortex and a high fraction of air that experienced small net subsidence. As a measure for the strength of the Brewer-Dobson circulation and meridional mixing in autumn, we use the Eliassen-Palm flux through the mid-latitude tropopause averaged from August to November. In the lower stratosphere, this quantity correlates well with both the ozone amount in early winter and the origin of air enclosed in the vortex.

Citation: Blessmann, D., Wohltmann, I., and Rex, M.: Influence of transport and mixing in autumn on stratospheric ozone variability over the Arctic in early winter, Atmos. Chem. Phys. Discuss., 12, 15083-15113, doi:10.5194/acpd-12-15083-2012, 2012.
 
Search ACPD
Discussion Paper
    XML
    Citation
    Final Revised Paper
    Share