【摘要】 对1986—1988年“向阳红09”号5个航次的黑潮调查及日本资料进行了分析,结果指出,这一期间黑潮又发生一次大弯曲现象。本文讨论了这次大弯曲的形成、强盛、衰消过程,认为东海PN断面的流量变异与黑潮大弯曲有一定联系,还对黑潮流量及流轴摆动均作了最大熵谱分析,获得其主要周期。更多还原

【Abstract】 The variation of the Kuroshio during the period of 1986-1988 is examined using the observations conducted on the vessel "Xiangyanghong 09" at that time and the historical Kuroshio data from Japan.The formation, maturity and decay of a large meander of the Kuroshio occurred during 1986-1988 are analysed for the first time in this paper.The Kuroshio is a narrow and strong current with a single core and bunch. The stream axis slops down gradually to the right of the Kuroshio with the increasing depth. The periods of its oscillation are 12.3 and 3.3 months in the northern Kuroshio area of the East China Sea, while the period is obscure in its southern area. In the area south of Japan, the periods of stream axis oscillation are about 12.3, 8.2 and 5 months except for a few region where periods of oscillation were not obvious.The volume transport for each seasons on PN section is larger than its annual mean value with a positive anomaly, but smaller than its annual mean value with negative anomaly on the KG section. On the contrary, when the meander doesn’t appear, the volume transport on the PN section has a negative anomaly and a positive anomaly on the KG section. These phenomena have been verified with the volume transport on the PN section, but not on the KG section.Periods of Kuroshio volume transport vary with sections and seasons, e.g. 3.3 years in winter and 14 and 4.7 years in summer on the PN section, 14 and 7 years in winter and summer on the KD section, and 2.9 years in winter and 19.6, 3.2 years in s’ummer on the KG section.更多还原