Heidelberg 2006 – scientific programme

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UP: Umweltphysik

UP 15: Poster: Atmosph
äre und Klima

UP 15.13: Poster

Tuesday, March 14, 2006, 14:00–16:00, C

Comparison of modelled and measured chlorine dioxide slant columns for the arctic winter 2004/2005 — •Hilke Oetjen, Thomas Medeke, Andreas Richter, Ninad Sheode, Björn-Martin Sinnhuber, Folkard Wittrock, and John P. Burrows — Institute of Environmental Physics, University of Bremen, 28334 Bremen

One of the important issues in atmospheric science is the stratospheric ozone depletion especially in polar regions. The most important halogen radicals involved in the ozone destruction are BrO and ClO. Whereas BrO can easily be detected by UV/visible spectroscopy this is not the case for ClO. But observations of chlorine dioxide (OClO) give a good indicator for chlorine activation in the polar vortex since the concentration of OClO is approximately proportional to the product of the concentrations of BrO and ClO during dawn and dusk.

This study presents ground-based and satellite, i.e. SCIAMACHY, measurements of chlorine dioxide by means of UV/visible spectroscopy over the Arctic for the exceptional winter 2004/2005. This winter was characterised by almost complete chlorine activation. The measurements will be compared to model calculations.