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Chemical effects in 11-year solar cycle simulations with the Freie Universität Berlin Climate Middle Atmosphere Model with online chemistry (FUB-CMAM-CHEM)

Authors

Langematz,  U.
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Grenfell,  J.
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Matthes,  K.
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Mieth,  P.
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Kunze,  M.
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Steil,  B.
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Brühl,  C.
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Citation

Langematz, U., Grenfell, J., Matthes, K., Mieth, P., Kunze, M., Steil, B., Brühl, C. (2005): Chemical effects in 11-year solar cycle simulations with the Freie Universität Berlin Climate Middle Atmosphere Model with online chemistry (FUB-CMAM-CHEM). - Geophysical Research Letters, 32, L13803.
https://doi.org/10.1029/2005GL022686


https://gfzpublic.gfz-potsdam.de/pubman/item/item_238370
Abstract
The impact of 11-year solar cycle variations on stratospheric ozone (O3) is studied with the Freie Universität Berlin Climate Middle Atmosphere Model with interactive chemistry (FUB-CMAM-CHEM). To consider the effect of variations in charged particle precipitation we included an idealized NO x source in the upper mesosphere representing relativistic electron precipitation (REP). Our results suggest that the NO x source by particles and its transport from the mesosphere to the stratosphere in the polar vortex are important for the solar signal in stratospheric O3. We find a positive dipole O3 signal in the annual mean, peaking at 40–45 km at high latitudes and a negative O3 signal in the tropical lower stratosphere. This is similar to observations, but enhanced due to the idealized NO x source and at a lower altitude compared to the observed minimum. Our results imply that this negative O3 signal arises partly via chemical effects.