Special features of this experiment (ECHAM3_T42_70003anom):
This experiment was made with changed SSTs in the N-Atlantik, lowered SST's in
the N-Pacific, but with additional ice sheets, insolation, CO2 lowered and some
land points added.
The global response to these boundary conditions was analysed using three
variables: surface temperature, zonal wind speed, precipitation.
The statistical significance of the changes was tested with a two tailed t-test.Moreover, the significant responses to cooled oceans were compared with
geological evidence of a YD oscillation. This comparison revealed a good match
in Europe, Greenland, Atlantic Canada and the North Pacific region, explaining
the YD oscillation in these regions as a response to cooled N-Atlantic an
N-Pacific Oceans. However, the results leave the YD climate in other regions
completely unexplained. This reflects either an insufficient set of boundary
conditions or the important role played by feedbacks within the coupled
atmosphere-ocean-ice system. These feedbacks are poorly represented in the used
atmospheric model, since ice sheets and the ocean surface conditions have to be
prescribed.