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Stratification in central Bohai Sea and how it has shaped hypoxic events in summer

Acta Oceanologica Sinica 2024年第9期43卷 93-104页

作者： jie Guo diansheng ji Xiangyang Zheng Yanfang Li Haitian Tang Chawei Hou CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China Shandong Key Laboratory of Coastal Environmental Processes Yantai 264003China Yantai Marine Center of the Ministry of Natural Resources Yantai 264006China

In the last 10 years(2012-2021),five hypoxic events have been observed in summer in the central Bohai Sea(CBS).Frequent and persistent hypoxia will have an impact on the ecosystem of the *** this paper,historical sea temperature(ST),salinity(SAL),density(Den),and dissolved oxygen(DO)concentration data from three stations in the CBS are analyzed via the linear regression method,and the correlations between the stratification factors(ST,SAL,and Den)and DO concentration are *** thresholds of the stratification factors at the three stations in June in the year in which hypoxia occurred were determined and applied to survey data from 29 stations in late May to early June in 2022 in the CBS;this assessment found that the data from 19 stations indicated that hypoxia was about to *** August,the survey data showed that 14 out of the 29 stations indicated hypoxic conditions,of which 12 were from the predicted 19 stations,meaning that the estimation accuracy reached 63%.The same approach was applied to data from June *** data for August from a bottom-type online monitoring system in the CBS verified the occurrence of hypoxic events around *** results show that the strength of the seawater stratification plays a leading role in hypoxic events in the summer in the CBS,and the thresholds of the stratification factors can be used to predict the occurrence of hypoxic events.

关键词： hypoxia central Bohai Sea sea temperature salinity sea-water density stratification

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Impact of tropical cyclone Matmo on mixed zone of the Yellow and Bohai Seas

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Journal of Oceanology and Limnology 2018年第5期36卷 1484-1493页

作者： GUO jie ji diansheng HOU Chawei GUO Kai ji Ling Yantai Institute of Coastal Zone Research Chinese A cademy of SciencesKey Laboratory of Coastal Environmental Processes and Ecological RemediationCAS Shandong Provincial Key Laboratory of Coastal Environmental Processes Yantai 264003China 2 YantaiMarine EnvironmentalMonitoring Central Station State Oceanic Administration（SOA）Yantai 264006China

The Bohai Sea is a low-lying semi-enclosed sea area that is linked to the Yellow Sea via the Bohai straits(mixed zone). Its of fshore seabed is shallow, which makes it vulnerable to serious marine meteorological disasters associated with the northward passage of Pacific tropical cyclones. Analyses on data of remote sensing and buoy of the mixed zone of the Yellow and Bohai seas indicate that all the wind speed, significant wave height, and salinity(SAL) increased, sea surface temperature decreased, and wind energy density changed considerably during the passage of tropical cyclone Matmo on July 25, 2014. It was found that the SAL inversion layer in the mixed zone of the Yellow and Bohai Seas was caused by the tropical cyclone. Furthermore, it was found that the tropical cyclone transported the northern Yellow Sea cold water mass(NYSCWM) into the mixed zone of the Yellow and Bohai Seas. The NYSCWM has direct influence on both the aquaculture and the ecological environment of the region. Therefore, further research is needed to establish the mechanism behind the formation of the SAL inversion layer in the mixed zone, and to determine the influence of tropical cyclones on the NYSCWM.

关键词： Yellow and Bohai seas mixed zone northern Yellow Sea cold water mass wind speed sea surface temperature salinity

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Using radium isotopes to quantify submarine groundwater discharge at different scales in the Huanghe River Estuary,China

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Acta Oceanologica Sinica 2023年第8期42卷 32-39页

作者： Haowei Xu Disong Yang Xiaoyi Guo Maosheng Gao Guangquan Chen diansheng ji Shengtao Chen Huaming Yu Bochao Xu Frontiers Science Center for Deep Ocean Multispheres and Earth System/Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education Ocean University of ChinaQingdao 266100China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China College of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266100China North China Sea Environmental Monitoring Center of State Oceanic Administration/Key Laboratory of Ecological Prewarning and Protection of Bohai Sea Ministry of Natural ResourcesQingdao 266033China Shandong Provincial Key Laboratory of Marine Ecological Environment and Disaster Prevention and Mitigation Qingdao 266033China Qingdao Institute of Marine Geology Qingdao 266071China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Yantai Marine Center Ministry of Natural ResourcesYantai 264003China North China Sea Ecological Center Ministry of Natural ResourcesQingdao 266033China Key Laboratory of Ecological Prewarning and Protection of Bohai Sea Ministry of Natural ResourcesQingdao 266033China College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China Sanya Oceanographic Institution Ocean University of ChinaSanya 572000China

As an important land-ocean interaction process,submarine groundwater discharge(SGD)is composed of multiple dynamical processes at different scales and plays an important role in the study of coastal ocean geochemical ***,most of the existing studies focus on the quantification of the total groundwater discharge,few studies are about the differentiation and quantification of groundwater discharge processes at different scales(i.e.,short-scale SGD and long-scale SGD).As a world-class river,the Huanghe River is highly turbid and heavily regulated by *** natural and anthropogenic factors have a significant impact on groundwater discharge processes in the Huanghe River Estuary(HRE).In this study,the distribution patterns of the natural geochemical tracer radium isotopes(^(224)Ra and^(223)Ra)and other hydrological parameters in the HRE were investigated during four *** solving the mass balance of^(224)Ra and^(223)Ra in the HRE,the long-scale SGD flux was quantified as 0.01−0.19 m/d,and the short-scale SGD flux was 0.03−0.04 m/*** rate of short-scale SGD remained essentially constant among seasons,while the rate of long-scale SGD varied considerably at different periods and showed a synchronous trend with the variation of river *** results of this study are significant for understanding the SGD dynamics in the HRE and the contribution of SGD to the ocean geochemical budgets.

关键词： radium isotopes submarine groundwater discharge Huanghe River Estuary

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In-situ detection equipment for radon-in-water:unattended operation and monthly investigations

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Acta Oceanologica Sinica 2023年第8期42卷 178-184页

作者： Chunqian Li Meng Li Guangquan Chen Huaming Yu Chenglun Zhang Wen Liu jinjia Guo Shibin Zhao Lijun Song Xiliang Cui Ying Chai Lu Cao diansheng ji Bochao Xu Faculty of Information Science and Engineering Ocean University of ChinaQingdao 266100China R&D Center for Marine Instruments and Apparatuses Qingdao Marine Science and Technology CenterQingdao 266200China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China Frontiers Science Center for Deep Ocean Multispheres and Earth System/Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education Ocean University of ChinaQingdao 266100China College of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266100China Institute of Oceanographic Instrumentation Shandong Provincial Key Laboratory of Ocean Environmental Monitoring Techno1ogyQilu University of Technology(Shandong Academy of Sciences)Qingdao 266061China Yantai Marine Environment Monitoring Central Station of State Oceanic Administration Yantai 264003China

Radon is recognized as a powerful tracer of certain geophysical processes in marine and aquatic *** the past few decades,the instruments and methods for measuring radon concentration in water have been developed to some extent but still lack underwater in-situ *** we present an in-situ detection equipment for radon-in-water(pulsed ionization chamber(PIC)-radon)to measure dissolved radon in ocean and groundwater *** equipment has been successfully deployed in the jiaozhou Bay in July 2022 and has achieved 14 d of unattended underwater in-situ *** it was successfully placed in a groundwater monitoring well in the Laizhou Bay in November 2022 and monitored radon activities for over 30 *** results showed that this instrument had a good indication of submarine groundwater *** PIC-radon detector takes advantage of smaller size,lower power consumption,and is barely influenced by humidity,making it particularly suitable for long-term in-situ measurement,especially in harsh environments with limited human care or deployment spaces.

关键词： radon pulsed ionization chamber(PIC) in-situ measurement membrane groundwater ocean

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渤海中部油气开采区石油烃环境质量评价及源解析

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环境化学 2017年第6期36卷 1362-1368页

作者：刘旭纪灵纪殿胜姜军成李沅蔚王传远中国海洋大学法学院青岛266100 国家海洋局北海分局青岛266100 国家海洋局烟台海洋环境监测中心站烟台264006 中国科学院烟台海岸带研究所烟台264003

对渤海中部油气开采区表层沉积物中的石油烃含量进行了环境质量评价,分析了正构烷烃和多环芳烃分子组成特征,并对其来源进行了解析.结果表明,石油类浓度为12.5—860μg·g^(-1)之间,污染指数为0.61—41.97;随着与采油平台距离的增加,平... 详细信息

对渤海中部油气开采区表层沉积物中的石油烃含量进行了环境质量评价,分析了正构烷烃和多环芳烃分子组成特征,并对其来源进行了解析.结果表明,石油类浓度为12.5—860μg·g^(-1)之间,污染指数为0.61—41.97;随着与采油平台距离的增加,平台周边海域石油烃含量和污染水平呈现降低的趋势;沉积物沉积时为缺氧还原的沉积环境.正构烷烃的分布特征和甾萜烷生物标志化合物表明,源自大陆高等植物和海洋浮游生物的烷烃共存于渤海近代沉积物中,石油类产品和化石燃料燃烧产物对其贡献不能忽视;石油平台站位PAHs主要来自石油的直接输入,其它站位主要来自燃烧源.

关键词：渤海溢油污染多环芳烃风险评价污染源石油开采

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The Regulatory Effect of Braided Silk Fiber Skeletons with Differential Porosities on In Vivo Vascular Tissue Regeneration and Long-Term Patency

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Research 2023年第2期2022卷 247-264页

作者： Xili Ding Weirong Zhang Peng Xu Wentao Feng Xiaokai Tang Xianda Yang Lizhen Wang Linhao Li Yan Huang jing ji diansheng Chen Haifeng Liu Yubo Fan School of Engineering Medicine Beihang UniversityBeijing 100083China Key Laboratory of Biomechanics and Mechanobiology(Beihang University) Ministry of EducationBejing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijing 100083China 3 eRobot Institute School of Mechanical Engineering and AutomationBeihang UniversityBeijing 100083China

The development of small-diameter vascular grafts that can meet the long-term patency required for implementation in clinical practice presents a key challenge to the research *** techniques such as the braiding of scaffolds can offer a tunable platform for fabricating vascular grafts,the effects of braided silk fiber skeletons on the porosity,remodeling,and patency in vivo have not been thoroughly investigated.

关键词： field skeleton thoroughly

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激光切割机升降工作台液压系统的设计

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锻压装备与制造技术 2012年第3期47卷 54-55页

作者：潘殿生厉荣季鹏严伟江苏扬力数控机床有限公司江苏扬州225127 南京航天航空大学江苏南京210016

设计了一种用于激光切割机升降工作台的液压系统。该系统采用双联泵、串联液压缸、调速阀等实现了四个液压缸动作同步。

关键词：机械设计液压系统设计升降工作台激光切割机

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鲁迈拉油田R551井固井事故及处理

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非常规油气 2016年第5期3卷 105-109页

作者：张殿胜冀成楼冯光彬占焕校中国石油伊拉克公司鲁迈拉项目作业部北京100120

鲁迈拉油田固井难度大,有因为固井达不到要求而报废进尺的情况发生。针对此问题,以R551井固井事故的成功处理为例,介绍了复杂井型固井事故处理的方法和流程。首先确定主要产油层位和渗透层地层性质,然后采用超声波成像测井、噪声和温度... 详细信息

鲁迈拉油田固井难度大,有因为固井达不到要求而报废进尺的情况发生。针对此问题,以R551井固井事故的成功处理为例,介绍了复杂井型固井事故处理的方法和流程。首先确定主要产油层位和渗透层地层性质,然后采用超声波成像测井、噪声和温度测井等测井方法对胶结质量、封固层位等进行准确分析和描述,获取层间封隔、油层封固和层间可能窜流情况的一手数据,再通过流入测试的技术手段检验层间封隔有效性,最后确定了下封隔器的完井方法。该方法对R551井主要油层之间成功进行了封隔,达到了有效固井的目的,避免了盲目挤水泥甚至报废进尺进而侧钻的情况发生,减少了经济损失,为处理同类事故井积累了施工经验。

关键词：固井事故闪凝井壁垮塌流入测试

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