南黄海悬浮体浓度的平面分布特征及其输运规律

摘要

Based on the data of suspended matter collected from the southern Huanghai Sea investigation during 2006-2007,the distribution of the suspended matter and its transport trend were analyzed. It was focused on an analysis of the horizontal distribution of the suspended matter and its transport trend. The result shows that the distribution of the suspended matter has significant spatial-regional characteristics, which is in good correlation with the arrangement of a circulation. Seasonal transition circulations are the main dynamic and controlling factors of the suspended matter transport. Jiangsu coast is the highest region of the suspended matter concentration all the year around, the sediment resuspension caused by tide and wave as well as the carrying and transportation of North Jiangsu Province coastal water are the main source of the suspended matter in this area. Moreover, the cumulation of the suspended matter in Jiangsu coast in summer can also provide a necessary mechanism for its transportation to the southeastern sea area, due to the influence of the Huanghai Sea Western Coastal Current in winter half year. In spring, summer and autumn, noticeable high-concentration area exists in the northeast sea of the Changjiang Estuary and extends to the northeast,due to the effect of the Changjiang diluted water. As a result of the modern Huang-he River mass transportation caused by the North Shandong Province Coastal Current,a high-concentration area of the suspended matter also exists in Shidao coastal sea in winter, spring and autumn, and has the trend of spreading to the mud area in the central part of the southern Huanghai Sea. Meanwhile, it also is found that there was a high-concentration area displaying cloudy distribution in the surface and bottom water of the central investigation area in spring and autumn. And the "double peaks"phenomenon of the suspended matter concentration exists from spring to autumn, which has the close relationship with the organic debris produced by the phytoplankton during spring and autumn blooming that can make the marine plankton organic matter as the suspended solids shift to the sediments. It is further pointed out that the a-bove-mentioned matter source may play an important role in the formation and growth of the southern Huanghai Sea cold eddy mud area. Obviously,this viewpoint intensified the understandings of the impact of biological activities in the upper water on the cold eddy mud area in the central southern Huanghai Sea and the matter source of the mud area.%重点分析和探讨了南黄海悬浮体浓度的平面分布及其水平输运,结果显示悬浮体浓度具有显著的空间区域化分布特征,其与该海域环流场的布局和季节转换存在良好的对应关系,南黄海环流是该海域悬浮体运移的主要动力和控制因素；江苏近岸海域在一年四季均为悬浮体浓度的最高值区,其悬浮体主要来源于潮流和海浪所引起的沉积物再悬浮以及苏北沿岸水的携带和输送,而且夏季悬浮体在该海域的累积还可为冬半年在黄海西部沿岸流作用下将其输运至东南海域提供很好的物源保证；长江口东北部海域在春、夏、秋三季出现东北向扩展的高值区,体现了长江冲淡水的影响；石岛外海在冬、春、秋三季也存在悬浮体浓度高值区,并具有向南黄海中部泥质区扩展的态势,这是鲁北沿岸流将现代黄河物质输运至此的结果.发现调查海域中部表底层在春秋季均存在云团状高值区,而且该海域悬浮体浓度自春季至秋季出现“双峰现象”,这与春秋季水华期间浮游植物繁殖所产生的有机碎屑有关,并使作为悬浮体组成的海洋浮游生物有机质向沉积物转移,据此进一步指出这一物源可能对南黄海冷涡泥质区的形成、发育也具有一定的作用,该观点深化了对南黄海中部冷涡泥质区受上层生物活动影响以及泥质区物源的认识.