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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)
Author(s) -
Langematz Ulrike,
Grenfell J. Lee,
Matthes Katja,
Mieth Peter,
Kunze Markus,
Steil Benedikt,
Brühl Christoph
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl022686
Subject(s) - stratosphere , mesosphere , atmospheric sciences , atmosphere (unit) , solar cycle , electron precipitation , polar vortex , mesopause , precipitation , ozone , atmospheric chemistry , atmospheric model , physics , meteorology , magnetosphere , plasma , solar wind , quantum mechanics
The impact of 11‐year solar cycle variations on stratospheric ozone (O 3 ) 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 O 3 . We find a positive dipole O 3 signal in the annual mean, peaking at 40–45 km at high latitudes and a negative O 3 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 O 3 signal arises partly via chemical effects.