利用2018年夏季在西南黄海的现场调查资料,分析了海温、盐度和溶解氧(dissoloved oxygen,DO)分布特征。海区西侧的江苏沿海有明显的冷水带,冷水带对应表层较高的DO浓度。在海区南侧的长江口附近,盐度由南向北升高,上部海水DO浓度高,下部海水DO浓度低。综合现场观测数据、CCMP(Cross Calibrated Multi-Platform)海面风场遥感数据、AVHRR(NOAA-Advanced Very High Resolution Radiometer)海表温度遥感数据、SMAP(Soil Moisture Active and Passive)海表盐度遥感数据,初步分析了DO的影响因素:夏季偏南风产生从黄海向江苏沿海的上升流,可能有利于形成冷水带和DO高值区;长江冲淡水主要在海水上部向西南黄海扩展,它对水动力的影响及携带的营养盐是形成上层DO高值和底层缺氧现象的重要原因。
The low salinity water lenses（LSWLes） in the expansion area of the Changjiang diluted water（CDW） exist in a certain period of time in some years. The impact of realistic river runoff, ocean currents and weather conditions need to be taken into account in the dynamical analysis of LSWL, which is in need of research. In this paper, the POM-σ-z model is used to set up the numerical model for the expansion of the CDW. Then LSWL in summer 1977 is simulated, and its dynamic mechanism driven by wind, tide, river runoff and the Taiwan Warm Current is also analyzed. The simulated results indicate that the isolated LSWL detaches itself from the CDW near the river mouth, and then moves towards the northeast region outside the Changjiang Estuary. Its maintaining period is from July 26 to August 11. Its formation and development is mainly driven by two factors. One is the strong southeasterly wind lasting for ten days. The other is the vertical tidal mixing during the transition from neap tide to spring tide.
