南黄海悬浮体的垂直分布特性及其指示意义

Vertical Distribution of Suspended Matter and Implications in the Southern Yellow Sea

重点研究了南黄海典型断面的悬浮体垂直分布特性及其指示意义。结果表明:四季南海黄海北部断面悬浮体分布的共同特征是西高东低,冬、春季鲁北沿岸流携带悬浮体向南输运和黄海暖流北上是南黄海与北黄海进行物质交换的重要方式和途径;夏半年南黄海中部断面深水域存在的表层云团状悬浮体高值区或"中层悬浮体最大值"现象与该海域的生物活动具有密切的联系;冬、春季苏北浅滩外侧海域近岸区的悬浮体含量显著高于夏、秋季,且冬半年近岸区的悬浮体具有向外海输运的趋势;长江口东北部断面各季节均存在2个悬浮体高值区,其中位于断面西部近岸海域的高值区与长江冲淡水(夏季)或苏北沿岸水(冬季)的影响有关,位于断面东部深水域处的悬浮体高值区是黄海西部沿岸流物质输运的结果,并与济州岛西南部海域的泥质区总体相对应,黄海与东海的物质交换过程主要通过夏季长江冲淡水东北向扩展与冬半年黄海西部沿岸流南下和黄海暖流北上进行。另外,水体层化和陆架锋也显著影响着南黄海悬浮体的垂直分布状况,锋面是控制夏季悬浮体向外海深水区输运的主要物理机制。

Based on the data of suspended matter colleted from the southern Yellow Sea investigation during 2006-2007, the vertical distribution of the suspended matter and implications were analyzed. The result shows that the pattern of the suspended matter concentration being high in the west but low in the east is the common feature in the vertical distribution of the suspended matter in the northern transects of the southern Yellow Sea, and that the southward transportation of the suspended matter carried by the Lubei Coastal Current and the northward invasion of the Yellow Sea Warm Current are the important mass exchange processes between the northern Yellow Sea and the southern Yellow Sea. From spring to autumn, the high-concentration area displaying cloudy distribution in the surface or the mid-layer maximum phenomenon of the suspended matter in the deep waters of the central transects of the southern Yellow Sea has close relationship with the biological activities. In the transect outside Jiangsu shoal, the suspended matter concentration decreases offshore gradually all the year around, and the concentration in the nearshore waters in winter and spring is higher than that in summer and autumn, meanwhile, the suspended matter in the nearshore waters also shows the outward transport trend during winter half year（from autumn to spring）. In the transect northeast of the Yangtze Estuary, there are two high-concentration areas of the suspended matte, the one situated in the western nearshore waters is influenced by the Yangtze River Diluted Water （summer） or Jiangsu coastal Water （winter） while the east one located in the deep waters is the result of mass transportation complying with th Yellow Sea Western Coastal Current, which also in general corresponds to the mud area southwest of Jeju Island The mass exchange processes between the Yellow Sea and the East China Sea are implemented mainly through th northeastward expanding of the Yangtze Diluted Water in summer and the southward of the Yellow Sea Western Coastal Current and the northward invasion of the Yellow Sea Warm Current in winter half year. Besides, the stratification and the shelf front also have great impact on the vertical distribution of the suspended matter in the southern Yellow Sea, and the front is the main physical mechanism controlling the horizontal transport of the suspended matter.