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EP: Extraterrestrische Physik

EP 2: CAWSES

EP 2.15: Vortrag

Freitag, 4. März 2005, 18:30–18:45, TU BH349

The sensitivity of the middle and upper atmosphere to solar and anthropogenic climate forcing: Simulations with HAMMONIA — •Hauke Schmidt, Guy P. Brasseur, and Marco A. Giorgetta — Max Planck Institute for Meteorology, Bundesstr. 53, 20146 Hamburg

The HAMMONIA general circulation and chemistry model resolves the atmosphere from the Earth’s surface up to about 250 km. This newly developed model combines the 3d dynamics from the ECHAM5 model with the MOZART3 chemistry scheme. Additional parameterizations have been implemented to account for important processes in the upper atmosphere, like solar radiation in the extreme UV, the ion drag, and molecular processes.

This study concentrates on the response of dynamics and trace gases, in particular ozone and water vapor, in the mesosphere and lower thermosphere (MLT) region to solar and anthropogenic climate forcing. Results of different simulations with HAMMONIA for low and high solar activity on the one hand, and for present day and doubled CO2 concentration on the other hand are compared. The solar cycle experiments indicate e.g. an ozone increase for high solar activity of up to 25%, a temperature increase of 3 to 10 K, and a decrease in water vapor. Additionally, we address the effect of the different types of forcing on the energy budget of the MLT.