Leipzig 2002 – wissenschaftliches Programm
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UP: Umweltphysik
UP 9: Atmosphäre, Aerosole, Klima - Poster
UP 9.6: Poster
Montag, 18. März 2002, 16:30–18:00, Galerie 1
Ozone depletion and chlorine activation in the Arctic winter 2001/2002 and earlier winters — •Ingo Wohltmann1, Kai Lindner1, Klaus F. Künzi1, and Otto Schrems2 — 1Institut für Umweltphysik, Postfach 330440, 28334 Bremen — 2Alfred-Wegener-Institut für Polar- und Meeresforschung
Vortex averaged ozone loss rates for the most recent winters and chlorine activation derived from measurements of the ground based microwave radiometer RAM of the University of Bremen will be shown. Results are compared with the 3-D chemical transport model SLIMCAT and other methods.
The RAM is a microwave radiometer jointly operated by the University of Bremen and the Alfred Wegener Institute for Polar and Marine Research (AWI) situated in Ny-Ålesund, Spitsbergen. The radiometer measures ozone, ClO and H2O. Vortex averaged ozone loss rates are obtained by subtracting the diabatic descent from the observed ozone change using a radiative transfer model. The ozone observations of the RAM are assumed to be representative for the vortex, so that loss rates can be estimated from a single observation point. Additionally, corresponding chlorine monoxide measurements will be shown.
The results of the calculations will be compared with several different techniques for the determination of ozone loss. Some of the reasons for the different results of these methods like the altitude resolution and the calculation of heating rates are discussed.