scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Effect of Major Solar Energetic Particle Events on Polar Stratospheric Aerosols for Cycle 23 Mironova Irina 1 , Usoskin Ilya 2 1 2 Institute of Physics, St.Petersburg State University, Sodankyla Geophysical Observatory (Oulu unit) The present work is focused on evaluation of the possible influence of the greatly enhanced ionization caused by extremely strong solar energetic particle (SEP) events likes ground level enhancement events upon formation of new and growth of pre-existing aerosol particles in the low stratosphere over the polar region. A detailed analysis of variations of the daily profiles of aerosol extinction, obtained by space-borne POAM instrument in different wavelengths, for both Arctic and Antarctic polar regions during periods of major SEP events was done. We found statistically significant changes in the aerosol parameters associated with the SEP events. This means that increasing of solar cosmic rays induction ionization rate in the polar atmosphere leads to changes of physical-chemical properties (specifically the mean size of aerosol particles) in this area. A statistical test confirms that the observed changes of the chemical and physical properties of the polar troposphere are significant and are unlikely to be related to a spatial or temporal independent meteorological fluctuation of the aerosol and others contents.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 The atmospheric response to solar cycle variability simulated by MAECHAM5 with and without ocean coupling Misios Stergios , Schmidt Hauke Max Planck Institute for Meteorology The 11-year solar cycle variation has a well demonstrated impact on the Northern Hemisphere winter stratosphere. During early winter of maximum solar activity years the stratospheric vortex tends to be stronger and colder in contrast to minimum activity. While there is a relative consensus on the stratospheric response, the pathways through which the solar signal is propagated into the troposphere are still under debate. The surface response in particular regions, as in the Equatorial Pacific, further perplexes our understanding. In this work, we explore the inseparable troposphere-stratosphere response of the 11-yr solar cycle with the aid of fully coupled atmosphere-ocean general circulation model (GCM). Simulations with the MAECHAM5 GCM with a realistic time varying solar forcing (as observed from 1955 to 2006) and prescribed ozone anomalies are carried out. No other external forcing is considered. The quasi-biennial oscillation (QBO) is spontaneously generated in the model. We conduct 9 ensemble runs over 52 years each with MAECHAM5 coupled to the MPI ocean model (MPIOM) and compare the results to another 9 member ensemble with prescribed sea surface temperature (SST). In this study, the domain of interest is the equatorial and subtropical stratosphere and troposphere with a special focus on the Pacific region. Our analysis reveals that the tropospheric response in the coupled runs differs substantially from the uncoupled. The prescribed SSTs damp the temperature solar signal and statistically significant results are obtained only in the experiments with time varying SSTs. Both coupled and uncoupled simulations show a pronounced secondary maximum in the lower equatorial stratosphere which is somewhat stronger in the coupled ensemble. In the equatorial Pacific a tongue of weak negative temperature anomalies can also be found. In our presentation, we further elaborate on the mechanisms that may explain the simulated solar response.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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