东海内陆架泥质区夏季悬浮体的分布特征及影响因素分析

Distributions of Suspended Matter in the Inner-shelf Mud Area of the East China Sea in Summer and Their Influence Factors

通过对2007年夏季东海内陆架泥质区悬浮体的测定,探讨了该区悬浮体的分布特征及其影响因素,结果表明悬浮体的平面分布特征为近岸远高于远岸,闽江、瓯江等河流的河口位置浓度最大,等值线基本上平行于海岸线;垂向上悬浮体质量浓度随着水深的加大而增加,高值区大多出现在海底地势凸起的位置。研究区悬浮体的分布主要受陆源入海沉积物和东海流系格局的影响,其中近岸区域主要受控于河流入海物质和闽浙沿岸流;而台湾暖流、闽浙沿岸上升流则对远岸区域影响较大。研究区悬浮体质量浓度和海水浊度的相关性分析显示两者相关系数达0.91,这为通过水体浊度来反演区域的悬浮体质量浓度提供了基础。

The distributions of suspended matter and their influence factors were discussed based on the determination of suspended matter in the inner-shelf mud area of the East China Sea in the summer of 2007.The results show that the concentration of the suspended matter is much higher in the nearshore area than in the offshore area,with the maximum in the estuaries of the Minjiang River,the Oujiang River,and so on.The concentration isolines of the suspended matter are roughly parallel to the coastline.Vertically,the concentration of the suspended matter increases with the water depth,with high values occuring mostly at the raised areas of the seafloor.The distributions of the suspended matter in the study area are chiefly affected by the terrestrial material and the current system in the East China Sea.In the nearshore area the major factors influencing the distributions of the suspended matter are the material derived from rivers and the Min-Zhe Coastal Current,and in the offshore area are the Taiwan Warm Current and the coastal upwelling currents occuring in Fujian and Zhejiang provinces.The correlation analysis made between the concentration of the suspended matter and the turbidity of the sea water shows that their correlation coefficent reaches to 0.91,which can provide a reference for the inversion of regional concentration of suspended matter through the water turbidity.