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| A STUDY ON THE VARIATIONAL CHARACTERISTICS OF THE KUROSHIO UPPER LAYER WATERMASS IN WINTER |
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| In this paper, based on the temperature and salinity data obtained in 1956-1983 on section G in the East China Sea in winter, the temperature and salinity ranges and distribution of the Kuroshio Upper Layer Watermass (KULW) on section G are determined by t-S method. Its indicative characteristics are illstrated, its volume is calculated. The variational characteristics of KULW and the mixing circumstances of the Kuroshio with Continental Coast Water System are also studied with the following results. 1. KULW in the East China Sea can be classified by author into three types. In the strong years, the largest depth of lower boundary is deeper, western boundary extends further westward along the continental shelf, ’the salinity maximum in the core of high salinity larger, the depth of the core shallower. In the wesk years just the opposite. 2. The correlation of the volume of water body above 100m of KULW in the East China Sea with the depth of high salinity core is remarkable, the correlative coefficient being -0.43. 3. The correlation of the salinity maximum in the high salinity core oi KULW with the rate of flow of the Kuroshio in winter is remarkable, the correlative coefficient of the 3-years running mean of both being 0.53, that with corresponding temperature is also remarkable, the correlative coefficient of the 3-years running mean of both being 0.73. 4. The mixing process of the Kuroshio and Coastal Water System takes place mainly at those layers where the water temperature is higher than 15℃, no mixing is found where the temperature of the Kuroshio Water is below 15℃. Generally speaking, Kuroshio Water is affected by Continental Coastal Water System more remarkablly in the summer than in the winter. 5. The mixing process of the Kuroshio and Coastal Water System is classified by author into three types. In the strong years, mixing of first and second order take place mainly. The mixing region shifts westward. Upwelling is more remarkable. In the weak years, mixing of first, second, third and fourth order take place, the mixing region shifts eastward, upwelling is not remarkable. In the normal years, the mixing of first, second and third order take place. The mixing region of I-1 type water is bigger in the normal years than in the weak years, but smaller than in the strong years. The mixing circumstances is no intenser in the normal years than in the weak years, but is more complicated than in the strong years. |
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