The interannual analyses show a decrease in the average intensity of the AEJ-W in the mid-1970s, but no abrupt change in the latitude. The correlation between intensity and the corresponding latitude of AEJ-W was found to be insignificant. However, the intensity of the AEJ-E increased and latitude of AEJ-E decreased in the mid-1970s. The intensity and latitude in this case are strongly correlated (r=-0.57). The intensity of AEJ-W and AEJ-E are poorly correlated.
The relationships of these two components of the AEJ with Low Level Westerlies (LLW: at 850 hPa and between 15W-15E), North Atlantic Oscillation (NAO) index and Atlantic Nino are also examined. The results suggest a positive correlation between intensity of the AEJ-W and LLW (r= 0.45) and their corresponding latitudes (r= 0.45). There is also a high positive correlation between the location of the maximum AEJ-E and LLW (r=0.65). The analyses show that the intensity of the AEJ-W is positively lag-correlated with the April-June NAO (r=0.38), while negatively correlated with July-August NAO (r=-0.42). However, the intensity of the AEJ-E and the latitude of the core of both components appeared to be poorly correlated with NAO. Finally, the seasonal Sea Surface Temperature Anomalies (SSTA) of March-April, averaged over the Atlantic Nino region (25W-5E and 2S-6N), was lag correlated with the intensity and latitude of the two jets. It shows a relatively significant lag-correlation only with the maximum intensity of the AEJ-E (r=0.31).
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