期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2018
卷号：170
期号：3
页码：032016
DOI：10.1088/1755-1315/170/3/032016
语种：English
出版社：IOP Publishing
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.
