九龙江河口区水体溶解氧的垂直分布和时间变化特征

THE FEATURES OF TEMPORAL VARIATION AND VERTICAL DISTRIBUTION OF DISSOLVED OXYGEN IN THE JIULONG JIANG ESTUARY

海水的溶解氧含量是海洋中所发生的生物和化学过程的一种灵敏指标,也是判别水团和海洋环境质量评价的重要指标。现场海水的溶解氧含量受大气、生物,化学及各种物理过程影响,其分布变化具有区域性和季节性,而河口区水体的更为明显。本文据1980年10月至1981年10月九龙江河口区八个航次的调查资料,讨论该海区水体溶解氧含量及氧饱和度的垂直分布和时间变化特征。文中春、夏、秋和冬分别以4、8、10和2月为代表。

Based on the observed data from October 1980 to October 1981,the following conclusion have been made.The vertical distribution of dissolved oxygen in the Jiulong Jiang Estuary is firstly of vertical decrease type and secondly of even type.The curves of the diurnal changes of dissolved oxygen can bc divided into three types:double peak,single peak and even peak.Their diurnal changes are restricted by the mechanical mixing of river water with seawater and are affected by the photosynthesis of phytoplanktons.The annual variation of oxygen concentration tends to be higher in winter but lower level in summer,whereas the oxygen saturation degree tends to be higher in winter and summer but lower in spring and autumn.