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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Modulation of the 'stratospheric bridge' by the quasi-biennial oscillation and 11-year solar cycle in late winter Wei Ke 1 , Jadin Evgeny 2 , Chen Wen 1 Institute of Atmospheric Physics, 2 P.P.Shirshov Institute of Oceanology, 3 Analysisof the three-dimensional Eliassen-Palm fluxes indicated the existence of the “stratospheric bridge” forming by the upward planetary wave propagation from the troposphere over northern Eurasia in early winter and the downward wave signal from the stratosphere over North Atlantic in late winter. It is shown that the causesof the decadal violation of the Holton-Tan relationship of the extra-tropical stratospheric circulation with the equatorial quasi-biennial oscillation and the 11-year solar cycle impact can be associated with decadal changes of the “stratospheric bridge” modulation in January-February. The simple mechanism explaining the link of the eddy energy exchange between the troposphere and stratosphere with the stratospheric circulation on the interannual and decadal timescales is proposed.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Three dimensional model simulations of the impact of ion-chemistry induced by solar particle precipitation onto chlorine species Wieters Nadine 1 , Winkler Holger 1 , Sinnhuber Miriam 1 , Notholt Justus 1 , Wissing Jan Maik 2 , Berger Uwe 3 , Stiller Gabriele 4 , Von Clarmann Thomas 4 , Funke Bernd 5 1 Institute of Environmental Physics, University of Bremen, 2 University of Osnabrück, 3 Leibniz- Institute of Atmospheric Physics, Kühlungsborn, 4 Karlsruhe Institute of Technology (KIT), Institute for Meteorology and Climate Research (IMK-ASF), 5 Instituto de Astrosica de Andalucia, Granada, Spain Solar Energetic Particle Events and geomagnetic storms can produce fluxes of high-energy protons and electrons, which can enter the Earth’s atmosphere especially in polar regions. These particle fluxes primarily cause ionisation and excitation in the upper atmosphere, and thereby the production of HOx and NOx compounds, which are catalysts for the reduction of ozone. Besides the increase of HOx and NOx , the abundance of other species like chlorine are effected by solar particle induced ion-chemistry, as observations indicate. To simulate such particle events and their effect on chlorine species, ionisation rates calculated by the Atmospheric Ionization Module Osnabrück AIMOS (University of Osnabrück) have been implemented into the Bremen 3D Chemistry and Transport Model. The model is driven by meteorological data provided by the Leibniz-Institute Middle Atmosphere Model LIMA (IAP Kühlungsborn), to cover altitudes up to the mesopause. To account for the ion-chemistry regarding chlorine species in the neutral chemistry scheme of the Bremen 3D CTM, parameterised production rates calculated by the University of Bremen Ion-Chemistry model UBIC are included into the model. Model calculations for the solar proton event in October/November 2003 have been carried out and results will be presented and compared to measurements by the Michelson Interferometer for Passive Atmospheric Sounding MIPAS (ENVISAT) instrument.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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