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Based on the current measurement data from the R/V Ryofu Maru of JMA in the equatorial area along 137°E (1972-83) and 155°E (1972-79) the structures of the zonal velocity of the Equatorial Undercurrent (EUC) and the North Equatorial Countercurrent (NECC) and their variations are systematically analyzed in detail.At 155°E, the current at the equator and 100-300 m depth was a typical eastward EUC, it intensified in 1973-75, i.e., in the non-El Nino period. While the corresponding current at 137°E was mostly westward, and the origin of the EUC shifted to north of the equator around 0.5-1.5°N owing to the influence of the New Guinea Coast. The EUC origin disappeared in early July, 1982. Comparing with the EUC disappearance at 159°W, the average speed of an eastward travelling wave would be~1.1m/s.The velocity core of the NECC at 137 E generally shifted northward in winter and southward in summer, and was stronger in summer and weaker in winter. The fluctuations of the NECC were closely related to thos
Based on the current measurement data from the R / V Ryofu Maru of JMA in the equatorial area along 137 ° E (1972-83) and 155 ° E (1972-79) the structures of the zonal velocity of the Equatorial Undercurrent (EUC) and the North Equatorial Countercurrent (NECC) and their variations are systematically analyzed in detail. At 155 ° E, the current at the equator and 100-300 m depth was a typical eastward EUC, it intensified in 1973-75, ie, in the Non-El Nino period. While the corresponding current at 137 ° E was mostly westward, and the origin of the EUC shifted to north of the equator around 0.5-1.5 ° N owing to the influence of the New Guinea Coast. The EUC origin disappeared in early July, 1982. Comparing with the EUC disappearance at 159 ° W, the average speed of an eastward traveling wave would be ~ 1.1m / s. velocity core of the NECC at 137 E generally shifted northward in winter and southward in summer , and was stronger in summer and weaker in winter. The fluctuations of the NECC were close ly related to thos