Coupling of transport and chemistry

The spatial distribution and temporal variability of the radiation-active trace gases (such like ozone, water vapor and carbon dioxide) determines the global radiation and energy balances. It depends on temperature-dependent photochemical reactions and transports. The study of the vertical coupling of these complex interaction processes is challenging. The link between transport, radiation and chemistry of the middle atmosphere are subjects studied under this topic.

Methods

The studies rely on a hierarchy of models with different complexity: high-resolution circulation models (for example KMCM and UA-ICON), medium-resolution general circulation models with coupled chemistry, dedicated chemistry-transport models (for example CTM-IAP) and linear transport process models. For comparison, internationally available observations and assimilations of trace gas distributions are used. This wide spectrum of different observational data and model versions is necessary to understand the complex interaction of transport, radiation and chemistry. It gives solid ground to studies of long-term changes in the middle atmosphere (see also Long-term Dynamics). Further, new methods for the mathematical-numerical description of trace gas transports and chemistry of the mesosphere are developed.

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