Role of synoptic eddy feedback on polar climate responses to the anthropogenic forcing

Abstract

Amplified polar warming and moistening under global warming are critical issues for the climate changes. The authors find that a poleward shift of the westerly jet stream and associated synoptic eddy feedback play a critical role in enhancing polar warming and moistening. Namely, the mean circulation changes due to anthropogenic forcing lead to the changes in storm feedbacks, which reinforce again climate responses, particularly the polar responses such as the enhanced polar warming and moistening. It is demonstrated here that the storm feedback can be explained by a simple rule based on the mean circulation change. This rule can be used for understanding other regional climate responses to the anthropogenic forcing. Citation: Kug, J.-S., D.-H. Choi, F.-F. Jin, W.-T. Kwon, and H.-L. Ren (2010), Role of synoptic eddy feedback on polar climate responses to the anthropogenic forcing, Geophys. Res. Lett., 37, L14704, doi:10.1029/2010GL043673.