秋末寒潮大风作用下南黄海西部流场及温、盐度变动特征分析

CHARACTERISTICS OF CURRENT AND TEMPERATURE VARIATIONS IN THE WEST PART OF THE SOUTHERN YELLOW SEA UNDER STRONG WIND ACTION OF THE COLD WAVES IN THE LATE AUTUMN

1983年11月中美首次在南黄海西部开展水文和地质联合调查,该调查共设5个浮标站和54个CTD站,其中CTD站所获的温、盐度和溶解氧、透光度资料早已有过一些报道,并获得了一些有益的结论(丁宗信等,1986;熊庆成等,1986;赵保仁等,1986)。但对这次调查所取得的浮标测流资料尚未有人进行认真的分析研究,也未曾报道过。这次测流还是比较成功的,所揭示的现象使人感到振奋,而且这也是迄今在南黄海西部使用浮标最多、时间最长的一次浮标阵测流工作。

Analysis of measured data from five buoys emplaced in the southern Yellow Sea by a joint China and USA investigation team during November, 1983 revealed the characteristics of current and water temperature variations there,and the highly sensitive response of residual current to the strong winds of a cold wave. Strong north wind forcing on the surface induced strong southward residual currents at the every buoy station. During a weak wind period between two successive strong cold waves, wind whatever direction always induced about 5-15cm/s northward residual currents. Strong cold wave in the west part of the southern Yellow Sea caused the sea surface level to be high in the south and low in the north. The measured maximum sea surface slope was 1.0 × 106 ,During cold waves the dropping rate in the water temperature in the upper homogenous layer was thrice the averaged value in measurement periods. It was found that the heat loss of she water column was maximum at the boundary of the cold water mass. From the distributions of temperature and salinity and the heat lost the authors consider that the water will upwell along the boundary of the Yellow Sea Cold Water Mass in the late autumn as in summer.