东海1999年夏、冬上层水团的温、盐分布及其与历史平均状况的比较

Comparison of temperature and salinity distributions of upper layer water masses in the East China Sea in summer and winter 1999 with their historical average conditions

通过综合分析有关文献资料．提出了东海表层各个水团的温、盐指标并把它们分成3个水系（沿岸水系、混合水系和黑潮水系）。把1999年7月和2000年2月的观测结果与历史（1907~1986年的7月和2月）平均值比较后发现。1999年7月，东海表层水团及台湾暖流北上势力弱于历史平均状况，但它们朝东北方向推进;长江冲淡水的外侧部分在济州岛西南具有朝东南方向伸展的特征。2000年2月，黑潮入侵势力强于历史平均状况;黄海水团入侵东海的势力不大;与10-14℃等温线组成的浙江沿岸温度锋相对应，盐度锋不明显。根据东海各水团的温、盐判别数据，将实测资料和历史平均值资料进行对比．可判别各水团的分布和变化特征。

Through comprehensive analysis of related literatures, the thermo-saline indexes for each of water mass of the upper water layer in the East China Sea were given and water masses were classified into three groups, i.e. , coastal water, mixed water and Kuroshio water systems. After comparing the survey data obtained in July 1999 and Feb. 2000 with historical average conditions of July and Feb. from 1907 to 1986, it was found that, in July 1999, northward strengths of the upper water layer masses in the East China Sea and Taiwan warm current were weaker than historical average conditions, but northward strengths were relatively stronger; the outer part of the Changjiang diluted water expanded southeastwards in the area southwest of Chijudo island; In Feb. 2000, Kuroshio intrusion was stronger than historical average condition, while intrusion of the Yellow sea water mass into the East China Sea was not strong, corresponding to Zhejiang coastal thermal front which consisted of 10-14℃ isotherms, but the saline front was not obvi- ous. Based on the thermo-saline identification indexes of the water masses in the East China Sea, the characteristics in contribution and variation for the related water masses could be determined by comparing observed date with historical average conditions.