【摘要】 本文着重探讨东海北部区域底层冷水的形成和季节变化过程,指出北部冷水系冬季黄海沿岸水南下向东海输送低温水,并与外海高盐水混合变性形成的,它具有明显的移动规律。阐述了黄海沿岸水沿陆架下沉与黑潮次-中层水爬升的关系及其对北部冷水的影响。本文还分析了济州岛南部区域双跃层现象的类型及其波状结构的成因。发现上,下跃层之间存在着“跃层间环流”,它将导致双扩散的发生和有利于双跃层的维持。更多还原

【Abstract】 In this paper, the formative causes, the elementary characters and the seasonal varia-tional process of the bottom cold water in northern area of the East China Sea (named Northern Cold Water for short) are discussed with emphasis. It is pointed out that the Northern Cold Water is formed from the Huanghai Sea Coastal Water flowing southwards and transporting low temperature water to the East China Sea, where it mixes with and is modified by the high salinity water of open sea. The motion of Northern Cold Water has an apparent seasonal regularity, i.e., it first moves from the west to the east, then diminishes while moving northward. The whole variational process can be divided into four periods: the period of leaving coast of the cold water tangue; the period of semi-closing of the Northern Cold Water; the period of diminishing northwards and the period of regenerating. The causes of these variations are analysed and a detailed description is given of the relation between the lowering of the Huanghai Sea Coastal Water along the continental shelf and the climbing of the Kuroshio Subsurface-Intermediate Mixed Water and of its influence to the Northern Cold Water. The relation between the Northern Cold Water and the Bottom Cold Water Mass of the Huanghai Sea is also discussed.The types and the causes of the double-thermocline discovered south of Cheju-do Island are analysed. Here we explain specially its wavelike phenomenon. It is pointed out that this phenomenon are mainly caused by the lateral effect of strong current front area, the climbing of the Kuroshio Subsurface-Intermediate Mixed Water, the sidewise current induced by the density circulation around the Huanghai Sea Cold Water Mass and the shear effect induced by the difference of current speeds and current directions between the upper layer and the lower layer.It is also discovered that there is an inter-thermocline circulation in the double-thermocline, which is an interesting oceanographic phenomenon. It will generate double-diffusion and favour the maintaince of double-thermocline.更多还原