Influence Analysis of Phy-Oceanography Processes for Distribution Characteristics of Dissolved Oxygen in Fujian and Zhejiang Waters

Abstract

Dissolved Oxygen (DO) of sea waters is an important index to ecologic environment of sea. Multidisciplinary surveys were carried out in four seasons from August 2006 to December 2007 in Fujian and Zhejiang waters. Contents of DO in winter and spring were higher than those in summer and autumn. Except for winter, contents of DO show a decreasing trend from surface water to bottom. The overall horizontal distribution of DO In the shore is higher than that of in offshore,but the detailed distribution is different in different seasons. The influence of Physical oceanography processes such as coastal current of Fujian and Zhejiang ,coastal upwelling and the intrusion of open-sea current, on Distribution Characteristics of Dissolved Oxygen was discussed by analyzing hydrologic and meteorologic data. The main conclusions are as follows:The contents of DO is negative correlated with Seawater temperature and salinity. The contents of DO in the shore is high which is impacted by the Yangtze diluted water and coastal current of Fujian and Zhejiang: There are three main reasons why the contents of DO are low in part sea waters of the studied area, which are the intrusion of Taiwan warm current and kuroshio water, the coastal upwelling and the stratification of water.