南黄海水团和悬浮体分布及其光学性质

THE WATER MASSES AND THE SUSPENDED MATTERS DISTRIBUTIONS OF THE SOUTH YELLOW SEA AND ITS OPTIC CHARACTERISTICS

应用1983年11－1984年7月观测的温度、盐度和光学衰减系数C作为划分水团指标，采用逐步聚类分析方法划分南黄海水团，并对南黄海的悬浮体分布和光学性质进行了分析讨论。结果表明，将海水光学衰减系数作为划分水团指标是可行、有效的。分析结果为：夏季表层有黄海水团、黄海冷水团和长江冲淡水，底层只有黄海水团和黄海冷水团，并且存在着混合带。秋季水团基本上保持着夏季型，但长江冲淡水缩小，不存在混合带。南黄海底层水的主要光学特征具有明显的区域性，并大体上可分为如下区域：（1）中、东部区域，相当于黄海底层冷水区域，最大光学衰减系数大于9；（2）西部区域，黄海水团区域，呈东南向条状，其轴心区的光学衰减系数C＞1；（3）西南部区域，包括苏北沿岸水与黄-东海混合水；（4）西北部区域，相应于黄海底层浑水侵入区。最后，用称重法获得的悬浮总量（ss）与c之间有线性关系：C=0．366SS＋0．50，相应的线性关系数为0．83。

The relatilve index of temperature, sallinity and optic attenuation coefficient at 55 stations in the South Yellow Sea (31°30'N, 38°00'E) were used as parameters to analyze the water masses there.Cluster analysis was used to obtain the water masses distribution in the upper and bottorn layers in the South Yellow Sea. The optic characteristics and distribution of suspended matter of the upper and bottom layers are discussed。In summer, there are three water masses at the surface: Huanghai water mass,Huanghai cold water mass and Changjiang River diluted water mass. At the bottom,there are also three water masses: Yellow Sea water mass, Yellow Sea cold water mass and mixing area water mass. In fall, the distributiion of water mass is similar to that in summer, but the area of the Changjiang River diluted water mass is smaller than that in summer and there is no mixing area.The optic characteristics of the area depends on the location. There are four areas: (a) Eastcenter part, containing Yellow Sea bottom cold water mass. Its maximum optic attenuation coefficient is greater than 9; (b) West part, containing the Yellow Sea water mass. At the area center the coefficient is greater than 1; (c) West-south part, where the water is very muddy; (d)West-north part containing muddy water coming from the North Yellow Sea.The following was the linear relation between the total weight of suspended anatters and the optic attenuation coefficient.c = 0.366ss +0.50The corresponding correlation coefficient is 0.83.