Tht distribution of nutrients and the relationship of them with the circulation condition in the western southern Huanghai Sea in autumn

Based on the data collected from the southern Huanghai Sea investigation during October and November,2007,an analysis of the distribution of nutrients and hydrological characteristics were focused on,moreover,the relationship between the transportation pattern of nutrients and circulation condition was also studied.The result shows that the material input caused by the Changjiang diluted water,the North Jiangsu (Subei) coastal water and North Shangdong (Lubei) coastal water leads to forming three areas with high nutrients concentration in the western coast of the southern Huanghai Sea;Because of the barrier effect of thermocline and the decomposition of organic matter,a large area with high nutrients concentration also exists in the bottom water of the central survey region,its scope is similar with the high silinity-cold water mass,the low-oxygen area as well as the low-pH area at the offshore bottom;the distribution of nutrients in the bottom water confirms that the Western Coastal Current of the southern Huanghai Sea in autumn is a strong flowing to south along the frontal area of the cold water mass,which can play an important role in the transportation of the nutrients to the southeastern sea area,in addition,this transportation trend further indicates the mixture and exchange process of the Huanghai Sea water with the East China Sea water.Simultaneously,through the analysis of three typical types on section distribution of nutrients,the influence of the Changjiang diluted water,the Western Coastal Current of the southern Huanghai Sea,the residual water of the cold water mass and the Huanghai Warm Current on the vertical distribution and transportation process of nutrients was clarified to a certain extent,as well,the rule that the vertical mixture reduced gradually from the south to the north was also revealed.