Long-term variations in biogenic elements of the Bohai Sea and the North Yellow Sea

2nd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Li, Bozhi^1 ; Zhao, Zihan^1 ; Sun, Qun^1

College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin

300457, China^1

关键词: Biogenic elements;    Bohai Sea;    In-situ data;    Interannual variation;    Negative correlation;    Phosphate concentration;    Yellow sea;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/170/3/032016/pdf
DOI  :  10.1088/1755-1315/170/3/032016

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Based on in situ data of the Bohai Sea and the North Yellow Sea from 1975 to 2000, inter-annual variations in the concentrations of dissolved oxygen (DO), phosphate, and silicate were analyzed. The results showed that DO exhibited a decreasing trend during the last 25 years, and that the trend in winter was stronger than that in summer. Furthermore, we found significant negative correlations between DO and the temperature of sea water, which were stronger in winter than in summer. During the last 25 years, phosphate and silicate concentrations declined with extreme yearly fluctuations. Moreover, the concentrations of phosphate and silicate reached a historically low value in the mid-1980s (1984-1987) during summer. In winter, phosphate concentrations fluctuated, but silicate concentrations showed a significant decline.