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基于2006至2007年“908”项目执行期间春夏秋冬共四个航次的CTD温盐数据,针对四个季节底层大面及大连-成山头断面温度和盐度的分布特征,分析了北黄海冷水团的季节变化,初步探讨了其消长过程,并与历史资料相比较,发现了关于北黄海冷水团的新问题。研究表明:夏季,北黄海冷水团温度和盐度与历史资料相比,低温中心位置存在东偏,但低温中心温度和盐度变化不大。春季,32.8 psu高盐水舌主轴位置较冬季偏西约75 km,123.5°E以东的原冬季盐度高值区的范围向北延伸的势力大减,退化为较弱的小高盐水舌冬。冬季,北黄海冷水团已经消失,黄海暖流呈舌状向北延伸。秋季,减弱的北黄海冷水团存在两个中心温度约9°C的低温中心。
Based on the data of CTD temperature and salinity data of four voyages in spring, summer, autumn and winter during the implementation of “908” from 2006 to 2007, according to the distribution features of temperature and salinity of the four major seasons and Dalian-Chengshanhead section, Seasonal changes of the Yellow Sea cold water mass, preliminary discussion of its growth and decline process, and compared with the historical data, found a new problem about the North Yellow Sea cold water mass. The results show that in summer, the temperature and salinity of the cold water mass in the northern Yellow Sea are east-easterly compared with the historical data, but the temperature and salinity in the low-temperature center do not change much. In spring, the main axis of the 32.8 psu high saltwater was located about 75 km west of the winter. The northward extension of the former winter salinity high-value region east of 123.5 ° E greatly reduced and degenerated into a weaker, high-saltwater wintering. In winter, the northern Yellow Sea cold water mass has disappeared, and the Yellow Sea warm current has a tongue-like extension to the north. In autumn, there are two cold centers in the weakened northern Yellow Sea chilled water mass with a center temperature of about 9 ° C.