Seminar on Physics and Chemistry of the Atmosphere (Abstract)
Experimental and modelling study of stratospheric ozone loss
Dr. Sophie Godin Beekmann
Alfred-Wegener-Institut, Potsdam
sgodin@awi-potsdam.de
06.12.2002, 13.00 c.t.
Raum N3380
DIAL lidars are widely used for the monitoring of stratospheric ozone in the framework of the NDSC (Network for the Detection of Stratospheric changes). Long term DIAL ozone measurements have been performed in the South of France at Observatoire de Haute-Provence (OHP - 43.91°N, 5.71°E) since 1986 and in Antarctica in Dumont d'Urville (66.4°S, 140°E) from 1991 to 2000. At OHP, the influence of Arctic ozone depletion to the measured ozone values was evaluated using the high-resolution chemical transport model MIMOSA-CHIM. This model was used on a more global scale to study the contribution of polar ozone loss to the mid-latitude ozone budget in two recent winters characterized by different meteorological conditions. In Antarctica, the lidar measurements allowed the evaluation of the air subsidence in autumn and the ozone loss linked to anthropogenic halogen compounds in spring. Due to the location of the Dumont d'Urville station close to the edge of the polar vortex, a detailed study of the permeability of the polar vortex as a function of altitude could be performed. A more global study of the Antarctic ozone loss was performed with UARS MLS ozone data remapped into the equivalent latitude-potential temperature coordinate system.