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UP: Fachverband Umweltphysik

UP 8: Poster

UP 8.2: Poster

Wednesday, March 11, 2026, 15:00–17:00, P1

Solar and Geomagnetic Forcing Effects on Middle Atmospheric Dynamics Simulated with ICON-ART*LINOZ — •Amrutha Vasudevan — karlsruhe Institute of Technology — Geomar Helmholtz Centre for Ocean Research Kiel

The paper discusses the effect of solar forcing and geomagnetic forcing on middle atmospheric dynamics, using the ICON general circulation model with ART simulations and LINOZ simulations. Simulations are carried out under solar forcing conditions at solar maximum and minimum, and with and without the upper boundary condition NOy, focusing on the role of energetics forced odd nitrogen. Solar forcing is imposed through irradiance spectra, and geomagnetic forcing through particle precipitation and ionization. In the chemistry-dynamics model, the interaction between ozone and NOy and wind and wave forcing has been considered. The paper finds important middle atmospheric responses in the mesosphere and lower thermosphere regarding zonal wind, wave mean flow, and the distribution of ozone, and there are large differences in the UBC(NOy) simulations compared with the non-UBC simulations. The paper emphasizes the crucial role played by the influx of NOy in simulating the solar and geomagnetically forced middle atmospheric variability.

Keywords: Middle Atmosphere; Solar and Geomagnetic Forcing; ICON model; ART and LINOZ Chemistry; NOy Upper Boundary Conditions