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UP: Fachverband Umweltphysik

UP 13: Postersession Bodenkunde, Kryosphäre, Meßtechnik, Ozeanographie

UP 13.8: Poster

Donnerstag, 26. März 2015, 10:45–19:45, G/Foyer

The Brewer-Dobson circulation and polar ozone depletion — •Martin Budde — IUP Uni Bremen

The Brewer-Dobson Circulation (BDC) plays a major role in ozone transport from the tropics to the poles and by that it governs the global distribution of total column ozone. Climate models predict a strengthening of the BDC in times of climate change. This would lead to an accelerated recovery of ozone abundance in higher latitudes. However so far there is no clear evidence of this strengthening. Another major driver of the global ozone distribution is the photochemical destruction of ozone, due to ozone depleting substances (ODS) such as chlorofluorocarbons (CFCs). A special case of this is the rapid depletion of ozone in the presence of polar stratospheric clouds. These clouds build up inside the polar vortices, are highly temperature dependent and strengthen the efficiency of ODS. In order to analyse the evolution of the higher latitude ozone abundance as a function of dynamical changes and the change in the abundance of ODS it is necessary to quantify both effects separately. In this work this is done by analysing the influence of the mid-latitude 100hpa eddy heat flux on the total ozone column in higher latitudes.