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Asymmetric chlorophyll responses enhanced by internal waves near the Dongsha Atoll in the South China Sea

Journal of Oceanology and Limnology 2023年第2期41卷 418-426页

作者： Meilin WU Huijie XUE fei chai State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen 361102China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Innovation Academy of South China Sea Ecology and Environmental Engineering Chinese Academy of SciencesGuangzhou 510301China

Internal waves(IWs)are small-scale physical processes that occur frequently in stratified marginal seas.IWs are ubiquitous and well documented in the northern South China Sea(n SCS),but few studies have explored the ecosystem responses to the IWs.MODISA chlorophyll-a(Chl-a)data from 2002 to 2014 were used to examine the distribution of Chl a near the Dongsha Atoll(DSA).Composite Chl a from about 40 IWs during spring and summer showed stronger response on the northern side than on the southern side of the DSA.One day after the passage of IWs,composite surface Chl a on the northern side increased from 0.11 mg/m3 to a maximum mean value of 0.18 mg/m3.It decreased to 0.13 mg/m3 after two days and maintained that level for several days after the passage of IWs.The enhanced surface Chl a likely caused subsurface Chl-a maximum and nutrients in the surface layer.Approximately 64%of the increase in surface Chl a was due to the uplift of the subsurface Chl-a maximum one day after the passage of IWs,while nutrient-induced new phytoplankton growth contributed about 18%of the increase a few days later.When the IWs occurred frequently in spring and summer,Chl-a level on the northern side was about 30%higher than that on the southern side.IW dissipation and its impact on nutrients and chlorophyll were stronger on the northern side of the DSA than on the south,which caused a north-south asymmetric distribution of Chl a in the region.

关键词： internal waves(IWs) phytoplankton nutrients Dongsha Atoll northern South China Sea

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Long-term trend of oceanic surface carbon in the Northwest Pacific from 1958 to 2017

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Acta Oceanologica Sinica 2022年第5期41卷 90-98页

作者： Xuanliang Ji fei chai Peng Xiu Guimei Liu Key Laboratory of Research on Marine Hazards Forecasting National Marine Environmental Forecasting CenterMinistry of Natural ResourcesBeijing100081China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou310012China School of Marine Sciences University of MaineOronoME04469USA State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou510301China

Contrasting decrease and increase trends of sea surface temperature(SST)have been documented in the western Subarctic(WSA)and the rest of the Northwest Pacific(NWP)from 1958 to 2017,respectively.Consequently,more(less)total carbon dioxide(TCO_(2))due to ocean cooling(warming)is transported to the surface,which leads to increase(decrease)of oceanic surface partial pressure of carbon dioxide(pCO_(2)).With the combined influence of the rising atmospheric carbon dioxide(CO_(2))level and changing ocean conditions,a prominent increase in oceanic surface pCO_(2) occurred with different rates of increase in summer and winter in the NWP.The oceanic surface pCO_(2) is mainly controlled by the variation of TCO_(2) at the interdecadal timescale and by SST at the seasonal timescale.Our results also indicate that increasing SST tends to strengthen the capability of ocean in absorbing anthropogenic CO_(2) in the NWP,while ocean’s uptaking ability is weakened in the cooling area of the WSA.

关键词： sea surface temperature oceanic surface pCO_(2) ocean cooling(warming) control factor

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Production of dissolved organic carbon in the South China Sea:A modeling study

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Science China Earth Sciences 2022年第2期65卷 351-364页

作者： Wentao MA Peng XIU Yi YU Yiling ZHENG fei chai State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China School of Marine Sciences University of MaineOrono 04469MaineUSA

The South China Sea(SCS)is the largest semi-enclosed marginal sea in the western Pacific.The alternation of East Asian monsoon causes a significant seasonal pattern of chlorophyll,primary productivity,and export flux of sinking particles.However,the source and sink of dissolved organic carbon(DOC)pools with different bioavailability are less studied.Here we evaluated the seasonal production of DOC in labile,semi-labile and refractory forms using a coupled physical-biogeochemical model.This study aims to understand the dynamics and budgets of organic matters in the SCS.Model results show that the production of labile,semi-labile and refractory DOC is highly correlated with the net primary productivity(NPP)which is higher in winter and lower in summer,reflecting a dependence of DOC on the NPP.The seasonal variation in Pearl River discharge dominates the DOC production in the northern coastal region.In the northeast,the Kuroshio intrusion associated frontal system is attributed to cause high winter production.The DOC production in the southwest is controlled by both winter mixing and summer upwelling.The production of refractory DOC with the least bioavailability favors carbon sequestration.Its annual mean production is 1.8±0.5 mg C m^(−2) d^(−1),equivalent to 26%of the export flux of particulate organic carbon at 1000 m.

关键词： Dissolved organic carbon Microbial carbon pump South China Sea Biogeochemical model ROMS CoSiNE

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Numerical investigation of the control factors driving Zhe-Min Coastal Current

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Acta Oceanologica Sinica 2022年第2期41卷 127-138页

作者： Yang Zhang fei chai Joseph Zhang Yang Ding Min Bao Yunwei Yan Hong Li Wei Yu Liang Chang State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China School of Marine Sciences University of MaineOronoME 04469USA Virginia Institute of Marine Science College of William&Mary Center for Coastal Resource ManagementWilliamsburgVA 23185USA Physical Oceanography Laboratory Ocean University of ChinaQingdao 266100China Department of Atmospheric and Oceanic Sciences Institute of Atmospheric SciencesFudan UniversityShanghai 200438China College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China

During the northeast monsoon season,Zhe-Min Coastal Current(ZMCC)travels along the Chinese mainland coast and carries fresh,cold,and eutrophic water.ZMCC is significantly important for the hydrodynamic processes and marine ecosystems along its path.Thus,this bottom-trapped plume deserves to be further discussed in terms of the major driving factor,for which different opinions exist.For this purpose,in this study,a high resolution Semi-implicit Cross-scale Hydroscience Integrated System Model(SCHISM)is established and validated.High correlation coefficients exist between along-shelf wind speeds and seasonal variations of both ZMCC volume transport and the freshwater signal.These coefficients imply that the wind is important in regulating ZMCC.However,for similar annual mean ZMCC volume transports,the extreme south boundaries of Zhe-Min Coastal Water(ZMCW)are different among different years.This difference is attracting attention and is explored in this study.According to the low wind/discharge experiment,it was found that although the volume transport of ZMCC is more sensitive to the variation of local wind speeds,the carried freshwater is limited by the Changjiang River discharge,which ultimately determines the south boundary of ZMCW.The momentum analysis at transects I and II shows that,for driving ZMCC,the along-shore wind forcing is as important as the buoyancy forcing.Note that this conclusion is supported by a zero-discharge experiment.It was also found that the buoyancy forcing varies with respect to time and space,which is due to variations of the discharge of Changjiang River.In addition,a particle tracking experiment shows that the substance carried by the Changjiang River diluted water would distribute along the Zhe-Min coastal region during the northeast monsoon season and it may escape due to the wind relaxation.

关键词： coastal current numerical model momentum analysis Changjiang River diluted water East China Sea

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Twenty years of ocean observations with China Argo

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Acta Oceanologica Sinica 2023年第2期42卷 1-16页

作者： Zenghong Liu Xiaogang Xing Zhaohui Chen Shaolei Lu Xiaofen Wu Hong Li Chunling Zhang Lijing Cheng Zhaoqin Li Chaohui Sun Jianping Xu Dake Chen fei chai State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou310012China Observation and Research Station of Global Ocean Argo System(Hangzhou) Ministry of Natural ResourcesHangzhou310012China Frontier Science Center for Deep Ocean Multispheres and Earth System/Key Laboratory of Physical Oceanography Ocean University of ChinaQingdao266100China Department of Atmospheric and Oceanic Sciences/Institute of Atmospheric Sciences Fudan UniversityShanghai200438China College of Marine Sciences Shanghai Ocean UniversityShanghai201306China International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China

The international Argo program,a global observational array of nearly 4000 autonomous profiling floats initiated in the late 1990s,which measures the water temperature and salinity of the upper 2000 m of the global ocean,has revolutionized oceanography.It has been recognized one of the most successful ocean observation systems in the world.Today,the proposed decade action“OneArgo”for building an integrated global,full-depth,and multidisciplinary ocean observing array for beyond 2020 has been endorsed.In the past two decades since 2002,with more than 500 Argo deployments and 80 operational floats currently,China has become an important partner of the Argo program.Two DACs have been established to process the data reported from all Chinese floats and deliver these data to the GDACs in real time,adhering to the unified quality control procedures proposed by the Argo Data Management Team.Several Argo products have been developed and released,allowing accurate estimations of global ocean warming,sea level change and the hydrological cycle,at interannual to decadal scales.In addition,Deep and BGC-Argo floats have been deployed,and time series observations from these floats have proven to be extremely useful,particularly in the analysis of synoptic-scale to decadal-scale dynamics.The future aim of China Argo is to build and maintain a regional Argo fleet comprising approximately 400 floats in the northwestern Pacific,South China Sea,and Indian Ocean,accounting for 9%of the global fleet,in addition to maintaining 300 Deep Argo floats in the global ocean(25%of the global Deep Argo fleet).A regional BGC-Argo array in the western Pacific also needs to be established and maintained.

关键词： Argo program China Argo ocean observation core Argo Deep Argo BGC-Argo

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基于海表温度遥感资料重构的热带不稳定波特征分析

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厦门大学学报（自然科学版） 2024年第3期63卷 512-525页

作者：高志斌王云涛柴扉上海交通大学海洋学院上海200240 自然资源部第二海洋研究所卫星海洋环境动力学国家重点实验室浙江杭州310012 厦门大学海洋与地球学院福建厦门361102

[目的]研究赤道东太平洋热带不稳定波(tropical instability waves,TIWs)的时空分布特征及其驱动机制.[方法]利用数据插值经验正交函数方法对MODIS卫星2003-2018年赤道东太平洋海表面温度(sea surface temperature,SST)数据进行重构,进... 详细信息

[目的]研究赤道东太平洋热带不稳定波(tropical instability waves,TIWs)的时空分布特征及其驱动机制.[方法]利用数据插值经验正交函数方法对MODIS卫星2003-2018年赤道东太平洋海表面温度(sea surface temperature,SST)数据进行重构,进而提取TIWs的波长和速度,并分析其时空分布特征以及与赤道风场和流场的关系.[结果]研究发现:TIWs在纬向上呈正负相位交替分布,在经向上则表现为双峰结构.季节性方面,TIWs在3-5月强度最弱,而在8-10月强度最强.纬向风场通过影响赤道纬向流场,特别是南赤道流(South Equatorial Current,SEC)的北分支(SEC-N)和北赤道逆流(North Equatorial Countercurrent,NECC)的剪切调控TIWs的生成;经向风场则通过调制“冷舌”边缘的SST梯度影响TIWs的生成.在年际尺度上,TIWs在厄尔尼诺(El Nino)年受到抑制,在拉尼娜(La Nina)年得到加强.纬向风场、纬向流场和TIWs三者的异常均超前于厄尔尼诺-南方涛动(El Nino-Southern Oscillation,ENSO)指数所刻画的赤道东太平洋SST异常,这表明纬向风场影响下的纬向流场剪切同样驱动TIWs的年际变化.NECC上空纬向风异常较弱,而SEC-N上空纬向风异常较强,这使得SEC-N年际变化主导流场剪切的强度,对TIWs的年际特征有重要作用.[结论]这一发现强调了大气风场和海洋动力过程共同驱动TIWs的季节性特征和年际变化.

关键词：赤道东太平洋海表面温度热带不稳定波厄尔尼诺-南方涛动

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钢铁企业机械设备维修管理策略探讨

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中国科技纵横 2024年第6期 82-84页

作者：柴飞邯钢设备运行保障公司河北邯郸 056000

钢铁企业的机械设备维修管理不仅直接关系设备的寿命和性能,还对生产效率、成本控制和竞争力产生深远影响.基于此,本文深入探讨钢铁企业在机械设备维修管理方面的策略,包括从数据分析到员工培训、从设备维修计划到故障排除,以及维修管... 详细信息

钢铁企业的机械设备维修管理不仅直接关系设备的寿命和性能,还对生产效率、成本控制和竞争力产生深远影响.基于此,本文深入探讨钢铁企业在机械设备维修管理方面的策略,包括从数据分析到员工培训、从设备维修计划到故障排除,以及维修管理的最佳实践,以期提高设备的可靠性,降低维修成本,推动钢铁企业高质量发展.

关键词：钢铁企业机械设备维修管理

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Salinity effects on the 2014 warm “Blob” in the Northeast Pacific

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Acta Oceanologica Sinica 2019年第9期38卷 24-34页

作者： Hai Zhi Pengfei Lin Rong-Hua Zhang fei chai Hailong Liu College of Atmospheric Sciences Nanjing University of Information Science and Technology Nanjing 210044 China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics (IAP) Chinese Academy of Sciences Beijing 100029 China College of Earth Sciences University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography Ministry of Natural Resources Hangzhou 310012 China School of Marine Sciences University of Maine Orono 04469-5706 USA

A significant strong, warm “Blob”(a large circular water body with a positive ocean temperature anomaly) appeared in the Northeast Pacific (NEP) in the boreal winter of 2013 2014, which induced many extreme climate events in the US and Canada. In this study, analyses of the temperature and salinity anomaly variations from the Array for Real-time Geostrophic Oceanography (Argo) data provided insights into the formation of the warm “Blob” over the NEP. The early negative salinity anomaly dominantly contributed to the shallower mixed layer depth (MLD) in the NEP during the period of 2012 2013. Then, the shallower mixed layer trapped more heat in the upper water column and resulted in a warmer sea surface temperature (SST), which enhanced the warm “Blob”. The salinity variability contributed to approximately 60% of the shallowing MLD related to the warm “Blob”. The salinity anomaly in the warm “Blob” region resulted from a combination of both local and nonlocal effects. The freshened water at the surface played a local role in the MLD anomaly. Interestingly, the MLD anomaly was more dependent on the local subsurface salinity anomaly in the 100-150 m depth range in the NEP. The salinity anomaly in the 50-100 m depth range may be linked to the anomaly in the 100-150 m depth range by vertical advection or mixing. The salinity anomaly in the 100-150 m depth range resulted from the eastward transportation of a subducted water mass that was freshened west of the dateline, which played a nonlocal role. The results suggest that the early salinity anomaly in the NEP related to the warm “Blob” may be a precursor signal of interannual and interdecadal variabilities.

关键词： warm “Blob” mixed layer depth surface and subsurface salinity anomalies

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Generalized Lagrangian Duality in Set-valued Vector Optimization via Abstract Subdifferential

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Acta Mathematicae Applicatae Sinica 2022年第2期38卷 337-351页

作者： Yan-fei chai San-yang LIU Si-qi WANG Department of Mathematics Xi'an Polytechnic UniversityXi'an 710048China School of Mathematics and Statistics Xidian UniversityXi'an 710071China College of Transportation Engineering Chang'an UniversityXi'an 710064China

In this paper,we investigate dual problems for nonconvex set-valued vector optimization via abstract subdifferential.We first introduce a generalized augmented Lagrangian function induced by a coupling vector-valued function for set-valued vector optimization problem and construct related set-valued dual map and dual optimization problem on the basic of weak efficiency,which used by the concepts of supremum and infimum of a set.We then establish the weak and strong duality results under this augmented Lagrangian and present sufficient conditions for exact penalization via an abstract subdifferential of the object map.Finally,we define the sub-optimal path related to the dual problem and show that every cluster point of this sub-optimal path is a primal optimal solution of the object optimization problem.In addition,we consider a generalized vector variational inequality as an application of abstract subdifferential.

关键词： Nonconvex set-valued vector optimization abstract subdifferential generalized augmented Lagrangian duality exact penalization sub-optimal path

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子宫内膜癌患者血清泛素耦联酶2C、三基序蛋白27表达水平及其与病理参数的相关性

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实用医学杂志 2024年第13期40卷 1808-1813页

作者：柴菲陈振文刘宏艳李肃龚媛媛赵莹莹山西医科大学汾阳学院病理教研室山西汾阳032200 山西省汾阳医院病理科山西汾阳032200 山西省汾阳医院妇产科山西汾阳032200

目的探究子宫内膜癌(EC)患者血清泛素耦联酶2C(UBE2C)、三基序蛋白27(TRIM27)表达水平及其与病理参数的相关性。方法选取医院2020年3月至2023年3月96例EC患者为EC组,同期子宫内膜非典型增生(EAH)患者65例为EAH组,体检健康者80例为对照... 详细信息

目的探究子宫内膜癌(EC)患者血清泛素耦联酶2C(UBE2C)、三基序蛋白27(TRIM27)表达水平及其与病理参数的相关性。方法选取医院2020年3月至2023年3月96例EC患者为EC组,同期子宫内膜非典型增生(EAH)患者65例为EAH组,体检健康者80例为对照组。酶联免疫法分析血清UBE2C、TRIM27水平。ROC曲线分析血清UBE2C、TRIM27水平评估EC发生的预测价值。结果EC患者血清UBE2C、TRIM27水平显著高于体检健康者(P<0.05)。EC患者血清UBE2C、TRIM27水平与肿瘤直径、肿瘤分化程度、淋巴结转移、FIGO分期、肌层浸润深、宫颈受累、雌激素受体表达、孕激素受体表达有关(P<0.05)。血清UBE2C与TRIM27水平呈正相关(r=0.475,P<0.001);血清UBE2C、TRIM27水平与肿瘤直径、淋巴结转移、FIGO分期、肌层浸润深度呈正相关,与肿瘤分化程度、雌激素受体表达、孕激素受体表达呈负相关(P<0.05)。UBE2C、TRIM27联合评估EC发生的AUC显著高于单项检测(ZUBE2C-联合=3.406,P<0.001,ZTRIM27-联合=3.285,P=0.001)。结论EC患者血清UBE2C、TRIM27表达水平上调,与病理参数密切相关,血清UBE2C、TRIM27水平可为早期诊断EC提供参考。

关键词：子宫内膜癌泛素耦联酶2C 三基序蛋白27 病理参数相关性

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