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

STP12 Abstracts
Berlin, 12 - 16 July 2010
SCOSTEP Symposium 2010
Modelling solar induced disturbed stratospheric Chemistry for the Period 2002 - 2005
Reddmann Thomas 1 , Versick Stefan 1 , Funke Bernd 2 , Lopez-Puertas Manuel 2 , Ruhnke Roland 1 ,
Stiller Gabriele 1
1 Karlsruhe Institute of Technology, 2 Instituto de Astrofísica de Andalucía
Model simulations of disturbed chemistry in the middle atmosphere
following energetic particle precipitation for the period 2002 - 2005 are
presented. Several realisations of the KASIMA model using a Bethe-Bloch
ionization rate module using GOES proton flux data or precalculated ionization
rates from the AIMOS data set including also effects from relativistic
electrons are compared with detailed observations taken with MIPAS/ENVISAT of
NO2, CO, and other species, allowing to evaluate the direct effects through
ionization and indirect effect through transport on the chemistry. As none of
these versions is able to simulate the strong intrusions in the Northern
winters 2003/2004 and 2005/2006, also different dynamical modes of the model
are tested where the relaxation terms to the analyses are varied. Including a
GCR component of the ionization rates is found to have effects on the NOy
budget in lower and middle stratosphere.