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南海是个准封闭的辽阔海域,它的尺度足以形成独立的水平环流和涡旋。徐锡祯等人(1980)利用最近50年约六千个站次的历史资料,研究了整个南海四季表层及深层的平均水平环流模式,指出东沙群岛东北方有一个反气旋性的暖涡,西南方有一个气旋性的冷涡。冷涡夏强冬弱;暖涡相反,冬强夏弱。1979—1982年,本所进行了南海东北部海区海洋学综合调查,郭忠信、仇德忠等(1984,1985)用实测资料计算表明,在东沙群岛东北方确实有一个反气旋性的暖涡,冬强夏弱,西南方有一个气旋性的冷涡,
South China Sea is a quasi-closed vast sea, its scale enough to form an independent horizontal circulation and vortex. Based on the historical data of about 6,000 stations in the past 50 years, Xu Xizhen et al. (1980) studied the surface and deep mean horizontal circulation patterns over the four seasons of the South China Sea. They pointed out that there is an anticyclonic warm vortex in northeastern Dongsha Islands, There is a cyclonic vortex. Cold vortex Xiaqiang winter weak; warm vortex on the contrary, winter strong summer weak. 1979-1982, the Institute carried out a comprehensive survey of the oceanography in the northeastern South China Sea. According to the measured data of Guo Zhongxin and Qiu Dezhong (1984, 1985), it is shown that there is indeed an anticyclonic warm vortex in the northeast of Dongsha Islands. Strong summer weak, southwest has a cyclonic cold vortex,