Abstract: The thesis uses the ECMWF/WMO grid data set to analyze the transient eddy,steady eddy,and their momentum,heat,moisture fluxes,and the Eliassen-Palm flux during the months of July in both 1982 and 1983,revealing the fact that the steady eddy and its northward transports of momentnm,temperature,moisture in the tropospheric atmosphere are anomalously strong in the summer just after the 1982-83 El Nino event. These results can be used to explain the anomalous atmospheric circulation and the summer weather in the middle latitudes and the tropics of the Northern Hemisphere.