Solar Induced Stratospheric Effects

Katja Matthes [kmatthes@ucar.edu], National Center for Atmospheric Research, Boulder, Colorado, and Freie Universität Berlin, Germany; Kunihiko Kodera,Meteorological Research Institute (MRI), Tsukuba, Japan; and Ulrike Langematz,Freie Universität Berlin, Germany.

            The 11-year solar cycle has an impact on the chemical, thermal, and dynamical structure of the atmosphere. Observational and modeling studies have shown that direct radiative changes in the upper stratosphere can lead to indirect dynamical changes throughout the atmosphere. The initial signal from the upper subtropical stratosphere is dynamically enhanced and transferred to the lower atmosphere through wave-mean flow interactions (modulation of the polar night jet at high latitudes and modulation of the meridional circulation at low latitudes).The mechanisms involved in the transfer of the solar signal as well as the influence on the troposphere will be discussed for different time scales (11-year solar cycle and Maunder Minimum) with the results from general circulation model studies in which the solar UV irradiance, solar induced ozone as well as equatorial winds are prescribed.