IEK-7 at Forschungszentrum Jülich has coordinated the RECONCILE project funded by the European Union under the Seventh Framework Programme. The aim of the project was to answer open questions concerning the depletion of the polar ozone layer and to improve predictions regarding the development of the ozone layer and the climate change to be expected in the stratosphere.
Innovative laboratory experiments, measurements with aircraft and balloon probes in the cold Arctic winter of 2009/2010 as well as process models on different scales were used to quantitatively understand and parametrize the dynamics of the polar vortex, the formation and development of polar stratospheric clouds (PSCs) and catalytic ozone depletion. The improved understanding of the processes is incorporated in a global chemistry-climate model and tested in novel procedures for the purpose of comparisons with measured time series.
Three measurement instruments of IEK-7 were used in the aircraft measurement campaign in Kiruna, Sweden: HALOX, FISH and CRISTA-NF. The CLaMS chemical transport model developed at Jülich was used for flight planning. CLaMS is also an important cornerstone for the scientific analysis and interpretation of field measurements. Research at IEK-7 focuses on transport processes and mixing processes, the precise impact of polar stratospheric clouds (PSCs) on stratospheric chemistry and trace gas concentrations, and the exact rate of chemical ozone depletion cycles.