Distribution Features of the Chemical Parameters in the Southern Yellow Sea in Summer

Based on the data collected from Southern Yellow Sea investigation during July,2006,this paper focused on an analysis of the distribution and influencing factors of chemical parameters.Hypoxia phenomenon was found in the bottom water(122°E～123°E,32°N～33°N),which indicated that the hypoxic zone of the Yangtze Estuary spread in the Southern Yellow Sea.The nutrients of the surface water in the southwest area of the Southern Yellow Sea mainly came from the transportation of the Yangtze diluted water and Subei Coastal Water,the nutrients and salinity were negatively correlated,which indicated that the conservatism was a characteristics of the nutrients,besides,the distribution of the surplus condition of the inorganic nitrogen was closely related to the extension of the water circulation.The high-nutrient tongue of the bottom water in the southwest of the Southern Yellow Sea extended to the northeast,which was the results of the combined effects of the weak Yangtze diluted water in bottom water,the Taiwan Warm Current water and the release of the nutrients caused by organic matter decomposition.A large number of nutrients accumulated in the Cold Water Mass of the Southern Yellow Sea due to the decomposition of organic matter.According to the sectional distributions of the chemical parameters in the Cold Water Mass of the Southern Yellow Sea,pointing that since the beginning of DO maximum layer to the time of observation,the oxygen produced by photosynthesis in the water volume under the DO maximum layer but in the euphotic zone would accumulate and preserve in the lower bound of the thermocline,which play an extremely important role in the formation of the DO maximum layer.