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The response of the middle atmosphere to solar cycle forcing in the Hamburg Model of the neutral and ionized atmosphere

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Schmidt,  H.       
The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;
Middle and Upper Atmosphere, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Brasseur,  G.P.       
The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Citation

Schmidt, H., & Brasseur, G. (2006). The response of the middle atmosphere to solar cycle forcing in the Hamburg Model of the neutral and ionized atmosphere. In Y. Calisesi (Ed.), Solar Variability and Planetary Climates (pp. 345-356). Berlin; Heidelberg: Springer.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-FCE5-F
Abstract
This paper studies the response of the middle atmosphere to the 11-year solar cycle. The study is based on numerical simulations with the Hamburg Model of the Neutral and Ionized Atmosphere (HAMMONIA), a chemistry climate model that resolves the atmosphere from the Earth’s surface up to about 250 km. Results presented here are obtained in two multi-year time-slice runs for solar maximum and minimum conditions, respectively. The magnitude of the simulated annual and zonal mean stratospheric response in temperature and ozone corresponds well to observations. The dynamical model response is studied for northern hemisphere winter. Here, the zonal mean wind change differs substantially from observations. The statistical significance of the model’s dynamical response is, however, poor for most regions of the atmosphere. Finally, we discuss several issues that render the evaluation of model results with available analyses of observational data of the stratosphere and mesosphere difficult. This includes the possibility that the atmospheric response to solar variability may depend strongly on longitude.