深圳东部近岸海域溶解氧的时空分布特征

Spatial and temporal distribution of dissolved oxygen in the coastal waters of eastern Shenzhen

根据2012—2016年的9个浮标自动监测数据,分析了深圳东部近岸海域溶解氧浓度的时空分布特征及其与主要水质参数的相关关系。结果表明,大亚湾海域溶解氧浓度含量在2.15~14.86mg·L^(-1)之间,平均值为7.31mg·L^(-1),大鹏湾海域整体表层溶解氧浓度范围为1.43~15.61mg·L^(-1),平均值为7.13mg·L^(-1);在时间分布上,深圳东部海域溶解氧含量呈现白天高于夜间,春、夏、秋季低,冬季高的趋势;在空间分布上,深圳东部海域溶解氧含量呈现出夏秋季大亚湾高于大鹏湾,春冬季大亚湾和大鹏湾相差不大的特点。Pearson相关性分析表明,该海区溶解氧含量与温度、盐度、浊度及叶绿素a存在显著的线性相关性,且相关关系呈现出随季节变化的差异性。

In the present work,we analyzed the spatial and temporal distribution of dissolved oxygen(DO)and the relationships between DO and water quality parameters of coastal waters in the eastern Shenzhen area.The data were collected from nine automated monitoring buoy platforms from 2012 to 2016.The results showed the ranges of DO in Daya Bay and Mirs Bay were from 2.15 to 14.86 mg·L-1 and from 1.43 to 15.61 mg·L-1,respectively.The mean DO in Daya Bay and Mirs Bay were 7.31 and 7.13 mg·L-1,respectively.Analysis showed the DO during daytime was higher than in nighttime,and the DO was higher during winter than in the other seasons.For comparison between locations,the DO in Daya Bay was higher than Mirs Bay in fall and summer but showed no difference in spring and winter.Pearson’s correlation analysis revealed the DO exhibited seasonally dependent linear relationships with temperature,salinity,turbidity,and chlorophyll-a concentration,respectively.