HR: 0800h
AN: A31A-0043    [Abstracts]
TI: The 27-day solar rotational cycle in the Freie Universitaet Berlin Climate Middle Atmosphere Model with interactive chemistry (FUB CMAM CHEM)
AU: Grenfell, J L
EM: grenfell@strat01.met.fu-berlin.de
AF: Institut fuer Meteorologie, Carl-Heinrich-Becker Weg 6-10 Freie Universitaet Berlin, Berlin, 12165 Germany
AU: * Langematz, U
EM: langematz@strat01.met.fu-berlin.de
AF: Institut fuer Meteorologie, Carl-Heinrich-Becker Weg 6-10 Freie Universitaet Berlin, Berlin, 12165 Germany
AU: Kunze, M
EM: kunze@strat01.met.fu-berlin.de
AF: Institut fuer Meteorologie, Carl-Heinrich-Becker Weg 6-10 Freie Universitaet Berlin, Berlin, 12165 Germany
AU: Matthes, K
EM: mkatthes@ucar.edu
AF: University Corporation for Atmospheric Research (UCAR), PO Box 3000, Boulder, CO 80307-3000 United States
AU: Krueger, K
EM: kkrueger@awi-potsdam.de
AF: Alfred-Wegener-Institut (AWI), Telegrafenberg A43 (Building A45-106), Potsdam, 14473 Germany
AU: Mieth, P
EM: peter.mieth@dlr.de
AF: Deutches Zentrum fuer Luft- und Raumfahrt, Institut fuer Verkehrsforschung, Rutherfordstr. 2, Berlin, 12489 Germany
AU: Steil, B
EM: steil@mpch-mainz.mpg.de
AF: Max-Planck Institut fuer Chemie, Joh.-Joachim-Becher Weg 27, Mainz, 55020 Germany
AB: We simulated twenty, perpetual Januaries each under solar minimum and maximum conditions using the Freie Universitaet Berlin Climate Middle Atmosphere Model with interactive chemistry (FUB CMAM CHEM) and including the 27-day solar rotational cycle. Cross-correlation functions (r) of tropical ozone and ultra-violet suggested peak values of +0.5 to +0.6 (with % changes in ozone of 0.4 to 0.6%) in the middle atmosphere and (-0.6 to -0.8) in the mesosphere (with % changes of up to 1%) , in line with other modelling and satellite studies. Peak correlations were generally 5-10% stronger for the solar maximum, compared with the solar minimum run. They also differed in altitude and in phase lag between solar minimum and maximum. This suggests it is important to separate data into solar minimum and maximum periods for such analyses. Modelled ozone-UV correlations peak at generally higher altitudes (0.2-1hP) compared with satellite studies which peak near 4hPa. Ozone sensitivity varied between 0.2 to 0.3% per % change in UV throughout the stratosphere. In addition to ozone, we examined chlorine monoxide (ClO) and hydroxyl (OH), as well as transformed Eulerian mean quantities such as the vertical velocity component. These quantities were also found to exhibit a clear cross-correlation response with UV over the 27-day cycle. In the troposphere at solar maximum we calculated a strong, positive correlation between temperature and the phase of the 27-day cycle which peaked at the surface (r=+0.99) with a peak-to-peak amplitude of +0.3 to +0.4K; this feature was not present for the solar minimum run.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0341 Middle atmosphere--constituent transport and chemistry (3334)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting