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

STP12 Abstracts
Berlin, 12 - 16 July 2010
SCOSTEP Symposium 2010
Differences in the atmosphere-ocean system response to solar activity variations of
various time scales
Raspopov Oleg 1 , Dergachev Valentin 2
1 St.-Petersburg Filial (Branch) of N.V. Pushkov Institute of Terrestrial Magnetism, Ionosphere and
Radiowaves Propagation of RAS, Russia, 2 A.F. Ioffe Physico-Technical Institute of RAS, St.-
Petersburg, Russia
Responses of atmospheric and climatic processes to solar forcing are analyzed. It is shown
that in the case of short-term solar activity variations (hours, days) the structure and dynamics
of atmospheric processes exhibit an almost real-time response. In the case of long-term solar
activity variations (years and longer) an important role is played by the atmospheric
circulation, and the atmosphere-ocean system as a whole begins to react to solar forcing. This
leads to regional responses to global solar forcing. In addition, in the case of decadal
variations (11- and 22-year solar cycles) the solar signal can interact with internal noises of
the atmosphere-ocean system in the same frequency range. Experimental data indicate that
this interaction can enhance the solar signal by a factor of 2-3.