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On the Northern Annular Mode Surface Signal Associated with Stratospheric Variability
Journal of the Atmospheric Sciences
The wintertime northern annular mode (NAM) at the surface is known to undergo slow intraseasonal variations in association with stratospheric variability, which leads the surface signal by up to several weeks. The relative contributions, however, of potentially relevant stratosphere-troposphere coupling mechanisms are not yet fully understood. In this study the relative roles of (i) the downward effect of the zonal-mean secondary circulation induced by quasigeostrophic (QG) adjustment todoi:10.1175/jas-d-12-0158.1 fatcat:qj43iqcrdfdbxfcnx4jsf75ml4