浙江近岸海域溶解氧的时空分布特征  

Spatial and Temporal Distribution of Dissolved Oxygen in Zhejiang Coastal Area

作　　者：刘瑞娟[1] 陈思杨[1] 余骏[1] 刘希真[1] 赵聪蛟[1] 张晓辉[1] LIU Ruijuan;CHEN Siyang;YU Jun;LIU Xizhen;ZHAO Congjiao;ZHANG Xiaohui(Marine Monitoring and Forecasting Center of Zhejiang Province,Hangzhou 310007,China)

机构地区：[1]浙江省海洋监测预报中心,杭州310007

出　　处：《海洋开发与管理》2023年第4期13-20,共8页Ocean Development and Management

基　　金：自然资源部海洋生态系统动力学重点实验室开放研究基金项目(MED202003);浙江省自然资源厅2021年度科技项目(2021-74);浙江省自然资源厅2022年度科技项目(2022-86、2022-88)。

摘　　要：溶解氧是海洋生态系统中重要的生源要素,其含量及分布变化直接或间接影响海洋生命活动。文章以2014—2018年浙江近岸海域海水监测数据为基础,系统分析溶解氧及其饱和度的时空变化特征,并对该海域内低氧现象作了初步探讨。结果表明,浙江近岸海域溶解氧及其饱和度时空变化特征明显。空间跨度分析显示,溶解氧及其饱和度平面分布为不同季节呈现不同的分布特征,垂直分布为表层高于底层,表底层差异在春夏季较大、秋冬季较小,主要与表层光合作用和季节性温盐跃层有关。时间跨度分析显示,表层溶解氧含量最高出现在冬季,最低出现在夏季,主要是受水温和表层光合作用的影响;夏季表层溶解氧含量最高出现在2018年,最低出现在2015年,这可能主要是受海表温度的影响。此外,研究发现近岸海域外侧少量区域出现低氧现象,其潜在风险正在进一步跟踪监测中。Dissolved oxygen is an important biogenic element in marine ecosystem,and the variation of its content and distribution could affect marine life activities directly or indirectly.In this paper,the spatial and temporal variaton characteristics were systematically analyzed and the occurrence of hypoxia was preliminarily discussed based on the seawater field monitoring data in Zhejiang coastal area from 2014 to 2018.The results showed that the spatial and temporal variation characteristics of dissolved oxygen and its saturation were obvious in Zhejiang coastal area.The spatial span analysis showed that the horizontal distribution of dissolved oxygen and its saturation presented different characteristics in different seasons,and the vertical distribution showed that dissolved oxygen and its saturation in the surface layer was higher than that in the bottom layer,and the difference between the surface layer and the bottom layer was larger in spring and summer,but smaller in autumn and winter,which was related to surface photosynthesis and seasonal thermohalocline.The time span analysis showed that the highest dissolved oxygen content in surface layer appeared in winter and the lowest in summer,which were affected by water temperature and surface photosynthesis,and the highest dissolved oxygen in surface layer in summer appeared in 2018 and the lowest in 2015,which was mainly caused by sea surface temperature.In addition,hypoxia was also found in some areas outside the coastal area,and its potential risks are being further tracked and monitored.

关 键 词：浙江近岸海域 溶解氧 时空分布 低氧 

分 类 号：P734.2[天文地球—海洋化学] P76[天文地球—海洋科学]