WP 1: Chemistry

Leaders: F. Stroh, C. Camy-Peret

Stratospheric ozone which itself is partly dominated by chemistry is governing the radiative budget of the stratosphere and therefore is a key species in stratosphere-climate interactions. The need to integrate stratospheric processes controlling ozone into future climate models was recently identified by Baldwin et al., (Science, 2007). In order to reliably simulate the atmospheric ozone abundance varying in space and time within models all relevant processes have to be fully understood. Generally, the picture seems to be solid in terms of chemical reactions, however, the reaction rates of major chemical processes controlling stratospheric ozone are still under discussion. We propose to study the relevant processes in late winter and early spring inside as well as outside the polar vortex through balloon-borne measurements of four well-proven payloads.

The main objectives are:

This proposal is thematically linked to the EU funded RECONCILE project. Within RECONCILE an airborne measurement campaign was conducted in winter 2009/2010 in the Arctic in order to improve the understanding of processes like ClOx partitioning, NOy redistribution, PSC formation, dynamical processes, and chemical ozone depletion (von Hobe, EGU Conf., 2010). We propose to extend the relevant research to the altitude regime above 20 km that can not be readily probed from high-flying aircraft but is crucial for chlorine activation, denitrification and ozone loss.

A. Chlorine chemistry

Questions we will try to answer

B. Bromine chemistry

Questions we will try to answer

C. Nitrogen oxides chemistry

Questions we will try to answer

Link to the description of the other workpackages.