中国科学院海岸带环境过程与生态修复重点实验室知识库

近海低氧区的发生是影响海洋生态系统健康的重要因素,也是海洋科学的研究热点.通过对2014年渤海夏季(8月末)航次观测数据的深入分析及与春(4月末)、秋(11月)两季观测的对比,研究了半封闭的渤海底层低氧区的分布特征、形成机制、及其与温盐结构的关系.结果表明,春季和秋季渤海底部溶解氧(DO)>8 mg/L,但在夏季出现大范围底部DO低值区,其中DO<7.8).冷水区稳定的沉积...

Formation of hypoxia zone in coast seas is a critical factor influencing the health of marine ecosystem and has becoming a focus of ocean science. The Bohai Sea in northeastern China is a semi-enclosed shallow sea receiving tremendous amount of terrestrial input of nutrients and sediments from several large rivers as well as coastal municipalities and has suffered serious eutrophication in the last two decades. Seasonal hypoxia has been reported on some locations in the Bohai Sea but relative few studies have been carried out to reveal its physical and biological mechanisms. Based on analysis of observation data from cruises conducted in the Bohai Sea in spring (May), summer (August), and autumn (November) of year 2014, this study investigated the spatial characteristics, formation mechanisms of bottom hypoxia zone in the Bohai Sea and its relationship with the seasonal thermocline. The results demonstrated that bottom dissolved oxygen (DO) was > 8 mg/L in Spring and Autumn of the Bohai Sea, but a large zone with low bottom DO appeared in Summer, among which are hypoxia zones (DO