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

STP12 Abstracts
Berlin, 12 - 16 July 2010
SCOSTEP Symposium 2010
Response of the whole atmosphere to solar cycle changes in radiative and geomagnetic
forcing
Marsh Daniel
National Center for Atmospheric Research
This talk presents a model study of the atmospheric response from the surface to the lower
thermosphere to changes in solar and geomagnetic forcing over the 11-year solar cycle. The
study utilizes the latest version of the NCAR Whole Atmosphere Community Climate Model
(WACCM4), a chemistry climate model with coupled ocean, sea ice and land components.
The model is run with observed variability in solar radiation, auroral activity and trends in
radiatively active chemical species. Multiple linear regression is used to separate secular
changes in chemistry and dynamics from those correlated to the periodic solar forcing. The
extent to which 11-year solar cycle variability leads directly or indirectly to changes in the
troposphere is investigated.