Distributions and influence factors of the chemical parameters in the Southern Yellow Sea in spring
南黄海春季海水化学要素的分布特征及其受控因素

Based on the data collected from the Southern Yellow Sea during April, 2007, the distributions and influencing factors of the chemical parameters were studies. The DO concentration and pH were high, while the nutrient concentration was low due to the photosynthesis of phytoplankton in the upper water column of the central- north area of the Southern Yellow Sea; meanwhile, because of the decomposition of organic matter, the low-value area of the DO and pH existed in the bottom water with relation high nutrient. In the southwest area of the Southern Yellow Sea, the DO concentration was low, and the nutrient concentration was high in the surface and bottom water due to the influence of the Subei Coastal Water, Yangtze diluted water and/or the Taiwan Warm Current water; the distribution of the surplus condition of the inorganic nitrogen was closely related to the extension of the water circulation, especially the Subei Coastal Water. Obviously, nutrients were transported to the southeastern sea area because of the Southern Yellow Sea West Coastal Current, a hydrodynamic process being revealed for the first time through the distribution of nutrients. Vertical distributions of the chemical elements in the oblique section had regional characteristics and spatial structure as a result of the Subei Coastal Water, the Yellow Sea Warm Current and the Southern Yellow Sea West Coastal Current.