| 摘要: |
| 随着现代光学仪器的发展，人们越来越多地利用海水的浊度、透光度或光束的吸收系数等在海洋中的分布来讨论海流、水团混合、海洋锋面等水文现象，以此作为温、盐等水文资料的重要补充。例如，Drake用表层海水的透光度揭示了Santa Barbar海峡中的环流状态。Matsuike和Morinaga曾用日本南岸黑潮区域中的光束吸收系数揭示了沿岸水进人黑潮主流的混合现象。Matsuike 等用光束吸收系数研究了长江冲淡水与外海高盐水之间和黄海沿岸水与东海高盐水之间的锋面特征。上述研究都是卓有成效的。
然而，在我国还很少使用过类似的方法来研究有关的海洋水文现象。1983年11月在中美南黄海环流与沉积动力学联合调查研究的首航调查中，使用25cm光程的透光度计(Transmissometer)精确地测定了南黄海的透光度值。本文将以这些资料为基础，阐明南黄海透光度值的分布规律及其同南黄海的水团分布、环流状态、潮汐运动等水文现象之间的关系。
25cm光程透光度计用产生波长为660nm红光的发光二极管作光源，这种光源接近单色，在蒸馏水中经过25cm光程后，仪器测得的最大透光度值为90%。由于该仪器使用单色红光光源，海水中的腐植酸等黄色物质对它影响很小，因此测得的透光度值可较真实地反映海水中悬浮物含量的多少。调查中将透光度计的信号接入Mark-III型CTD的备用通道，因此它的取样速率同温、盐等要素一样。
本次调查共设7个断面，54个CTD观测站，测站和断面分布如图1所示。 |
| 关键词: 透光度 环流 |
| DOI： |
| 分类号: |
| 基金项目:中国科学院海洋研究所调查研究报告第1167号 |
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| DISTRIBUTION OF TRANSMISSION AND ITS RELATION TO CIRCULATION IN THE SOUTHERN YELLOW SEA IN LATE AUTUMN |
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Zhao Baoren, Hu Dunxin, Xiong Qingcheng
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Institute of Oceanology, Academia Sinica
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| Abstract: |
| Features of distrilbution of transmission and their relation to front, tidal current and circulation in the Southern Yellow Sea in late autumn, 1983 are described. It has been found from observations that the distribution of transmission is very different on the two sides of the front of the Cold Water Mass of Yellow Sea, and that the transmission is higher in the upper layer in the Gold Water Mass area and lower in the bottom layer where isoplethes appear to be horizontal and related to quasimaximum tidal current. In contrast，transmission outside the front of Cold Water Mass is also lower and homogeneous vertically. The Water in the area where tidal mixing is strong is more turbid. It seems that diffusion of suspended matter is restrained by thermocline. Main currents such as the Warm Current and Coastal Current of Yellow Sea，and northward residual of the Taiwan Warm Current etc.can be easily identified from transmission distribution. |
| Key words: TRANSMISSION CIRCULATION |
