Other
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa11a..01f&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SA11A-01
Other
0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 0342 Middle Atmosphere: Energy Deposition (3334), 3334 Middle Atmosphere Dynamics (0341, 0342), 3360 Remote Sensing
Scientific paper
The polar stratosphere in the winters 2007/2008 and 2008/2009 was greatly disturbed by several stratospheric sudden warmings (SSW). The major stratospheric warming of February 2008 had a deep impact on the whole middle atmosphere: The warming was accompanied by updrafts and cooling of the upper troposphere, lower stratosphere and mesosphere. The strong cooling led to polar stratospheric clouds over England. These results demonstrate the vertical coupling of the whole atmosphere by a SSW, even at mid latitudes. During the same period our microwave radiometers in Bern (Switzerland) measured a more than 30% depletion in volume mixing ratio (VMR) of stratoshperic ozone and water vapor VMR enhancements of 20%. This ozone depletion is explained by the temperature increase of 50 K and more in the upper stratosphere and by transport of cold, ozone-poor air from the polar vortex, which was shifted to Switzerland in the lower stratosphere. The large temperature increase affects the catalytic NOx cycle, which more efficiently destructs ozone at higher temperatures. The increase of water vapor was a consequence of different transport processes depending on altitude. Air in the lower stratosphere was of polar origin whilst higher up air was transported to Switzerland from subtropical regions. At the end of January 2009 another SSW occurred and resulted in a splitting of the polar vortex. The troposphere was directly affected as the two vortices entrained heavy snow falls over Oklahoma and Kentucky as well as over France and England. Our radiometers again observed a significant decrease in ozone as well as changes in water vapor in the stratosphere. Hence SSW's are very suitable to demonstrate the coupling of lower and upper atmosphere. Latest results will be presented at the assembly.
de Wachter Evelyn
Flury Thomas
Haefele A.
Hocke Klemens
Kämpfer Niklaus
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