An observational study of tropical-midlatitude interaction on intraseasonal time scales during winter.

Abstract

Eight Northern Hemisphere winters of five- and ten-day average midlatitude 500 mb heights and tropical outgoing IR are used in a correlative study of tropical-midlatitude interaction. The seasonal cycle and interannual variability are removed so that only intraseasonal variability remains. Results indicate that energy predominantly propagates from midlatitudes to the tropics for both five- and ten-day averaged data, although the propagation is more apparent in five-day averaged data. -from Authors