Stratospheric ozone losses in a recent atmosphere
Abstract
Large inter-annual variability of chemical ozone loss during the recent Arctic winters has been observed under nearly constant halogen loading. A multi-year time slice experiment with the coupled chemistry-climate model ECHAM4.L39(DLR)/CHEM under ''2000'' conditions and constant halogen loading is used to evaluate the relationship between the chemical loss of total column ozone during a winter (ΔO_3) and the stratospheric volume where conditions are cold enough for the existence of polar stratospheric clouds (VPSC). In the Arctic polar vortex model results are compared to 2000 ozonesoundings for the winters 1992 to 2000 and to results of the SLIMCAT model for the corresponding time. The relationship between VPSC and the averaged winter heat flux (v'T') will also be investigated. The presented diagnostics allow to assess the model's ability to predict the evolution of polar ozone in a changing climate and to point out model deficencies.
- Publication:
-
EGS - AGU - EUG Joint Assembly
- Pub Date:
- April 2003
- Bibcode:
- 2003EAEJA.....8716E