Southern Hemisphere atmospheric circulation response to global warming

The response of the Southern Hemisphere (SH), extratropical, atmospheric ge neral circulation to transient, anthropogenic, greenhouse warming is invest igated in a coupled climate model. The extratropical circulation response c onsists of a SH summer half-year poleward shift of the westerly jet and a y ear-round positive wind anomaly in the stratosphere and the tropical upper troposphere. Along with the poleward shift of the jet, there is a poleward shift of several related fields, including the belt of eddy momentum-flux c onvergence and the mean meridional overturning in the atmosphere and in the ocean. The tropospheric wind response projects strongly onto the model's " Southern Annular Mode'' (also known as the "Antarctic oscillation''), which is the leading pattern of variability of the extratropical zonal winds.