2018年9月山东半岛东北近海海水溶解氧浓度观测研究  

An observational study on the near shore dissolved oxygen concentration around the northeastern Shandong Peninsula in Sept.,2018

作　　者：樊思琦 翟方国 刘子洲 顾艳镇 吴文凡 FAN Siqi;ZHAI Fangguo;LIU Zizhou;GU Yanzhen;WU Wenfan(College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao 266100,China;College of Oceanic,Zhejiang University,Zhoushan 316021,China)

机构地区：[1]中国海洋大学海洋与大气学院,山东青岛266100 [2]浙江大学海洋学院,浙江舟山316021

出　　处：《海洋湖沼通报》2023年第5期142-151,共10页Transactions of Oceanology and Limnology

基　　金：山东省自然科学基金(ZR2020MD059);国家重点研发计划(2019YFD0901305);浙江省重点研发计划(2020C03012);三亚崖州湾科技城管理局重大科技项目(SKJC-KJ-2019KY03)。

摘　　要：本文基于2018年9月28日海上观测得到的数据,分析了山东半岛东北部海域海水溶解氧浓度的空间分布特征,并探讨了温度、盐度、层结、海流和叶绿素a浓度等对海水溶解氧浓度的可能影响。结果表明:(1)海水溶解氧浓度在垂向上由表至底减小;在水平分布上则较为复杂:在25 m以浅溶解氧浓度从外海向近岸呈先增大后减小的特征,在25 m以深则从外海到近岸逐渐减小。(2)观测期间,溶解氧浓度存在三个比较明显的高值区域,分别位于近岸上层、外海上层和外海深层,并受不同因素的影响:近岸上层的高溶解氧浓度对应较高的叶绿素浓度,因此可能受浮游植物光合作用产生氧气的影响,外海上层的高溶解氧浓度可能与鲁北沿岸流输运至此的低盐高氧黄河冲淡水有关,而外海深层的高溶解氧浓度位于海水层结以下的冷水区域,可能受黄海冷水团的控制。(3)观测海域中部25 m以深水体的溶解氧浓度偏低,可能受海水层结抑制溶解氧湍流扩散和底层生物化学过程消耗氧气的共同影响。Based on the data obtained from the marine survey on Sept.28,2018,in this study,we analyzed the spatial distribution characteristics of dissolved oxygen in the northeastern sea of Shandong Peninsula,and explored the possible effects of temperature,salinity,stratification,current and chlorophyll a on dissolved oxygen concentration in seawater.The spatial distribution of dissolved oxygen concentration in seawater was characterized by a decrease from the surface to the bottom,an increase first and then a decrease from the open sea to the nearshore in water more shallow than 25 m and decrease from the open sea to the nearshore in water deeper than 25 m in the horizontal direction.During the observation period,there were three obvious centers of high dissolved oxygen concentration,which were in the upper layer offshore,and the upper layer and the deep layer off the coast,and were affected by different factors.The first one is corresponding to higher chlorophyll concentration,and therefore may be affected by phytoplankton photosynthesis that produce oxygen,the second one could be related to Lubei coastal current which transports dilute water of low salt and high oxygen of the Yellow River,and the third one is in the cold water under the stratification and may be controlled by the yellow sea cold water mass.The low concentration of dissolved oxygen in water deeper than 25 m in the middle of the observed sea area may be caused by the combined effects of seawater stratification which inhibit the turbulent diffusion of dissolved oxygen and the consumption of oxygen in the bottom biochemical process.

关 键 词：山东半岛东北部 溶解氧浓度 影响因素 

分 类 号：P715[天文地球—海洋科学]