Figure 12.5: (a) Response
(covariance, normalised by the variance of radiance fluctuations) of zonally averaged
annual mean atmospheric temperature to solar forcing for two simulations with
ECHAM3/LSG. Coloured regions indicate locally significant response to solar forcing.
(b) Zonal mean of the first EOF of greenhouse gas-induced temperature change simulated
with the same model (from Cubasch et al., 1997). This indicates that for ECHAM3/LSG,
the zonal mean temp-erature response to greenhouse gas and solar forcing are quite
different in the stratosphere but similar in the troposphere.