针对基于数据分发服务的分散式组网导航系统(decentralized networked navigation system based on DDS,DDS-DNNS)单定位节点状态估计问题,考虑节点能量约束及传感器增益退化,以Bayes理论为基础,设计了具有随机事件触发机制(stochastic ...针对基于数据分发服务的分散式组网导航系统(decentralized networked navigation system based on DDS,DDS-DNNS)单定位节点状态估计问题,考虑节点能量约束及传感器增益退化,以Bayes理论为基础,设计了具有随机事件触发机制(stochastic event-triggered,SET)的DDS-DNNS最小均方误差状态估计器。其中,SET机制通过比较是否传输测量值对应的后验估计的差异来决定测量值的重要程度。以此为基础,选取Wasserstein距离作为度量来表示后验估计的差异,并利用Wasserstein距离的性质及Bayes定理证明了后验估计是Gaussian的,从而得到了估计器的类Kalman滤波递推形式以及SET机制的显式表达式。证明了估计器的预测误差协方差有界,且上界和下界均收敛,同时,证明了平均信息传输率有界并推导得到了上界和下界的表达式。利用算例仿真演示了如何通过平均信息传输率的上界和下界确定调整矩阵,模拟了SET机制中一阶矩信息和二阶矩信息对SET机制的影响,同时采用比较实验验证了估计器的有效性。展开更多
Estuarine and bay ecosystems serve as crucial transitional zones for land-based pollutants entering the ocean.However,there is a critical gap in understanding the behavior of emerging pollutants in the numerous small ...Estuarine and bay ecosystems serve as crucial transitional zones for land-based pollutants entering the ocean.However,there is a critical gap in understanding the behavior of emerging pollutants in the numerous small estuaries and bays located in undeveloped coastal areas.This study provides insights into the fate of antibiotics in these small and scattered estuaries and bays in Shantou's coast,driven by land use types and hydrodynamic conditions.The findings indicated that estuaries were more heavily polluted with antibiotics than the bays(P<0.05),with tetracyclines and fluoroquinolones as the primary antibiotics.Antibiotic pollution levels were more severe in October than in June(P<0.01).Rainfall runoff,aquaculture tailwater,and river discharge were identified as the main sources of antibiotic pollution.Build-up land and aquaculture ponds were the primary land use types contributing to antibiotic pollution.The total antibiotic concentrations in June were positively correlated with the proportion of aquaculture ponds(P<0.05)and negatively correlated with the proportions of cropland and grassland(P<0.05).The concentrations of lomefloxacin and ofloxacin were positively correlated with build-up land.The antibiotic concentrations exhibited strong spatial heterogeneity within both bay and estuarine ecosystems driven by different hydrodynamic conditions.A comparative analysis of global estuaries and bays revealed that specific land-use types and hydrodynamic conditions produced similar trends in antibiotic fate.These insights offered new perspectives to safeguard the health of estuarine and bay ecosystems,such as altering landscape patterns and regulating aquaculture activities.展开更多
Pelagic appendicularians,known for their rapid bloom capability,are important secondary producers and play essential roles in marine ecosystems.To assess the environmental adaptation of the most common appendicularian...Pelagic appendicularians,known for their rapid bloom capability,are important secondary producers and play essential roles in marine ecosystems.To assess the environmental adaptation of the most common appendicularian species Oikopleura dioica in Jiaozhou Bay,Shandong,China,its annual variations in abundance and body size were investigated monthly at 12 stations in 2011,and the relationship between somatic growth and gonadal development was compared with previously published laboratory data.Oikopleura dioica exhibited distinct seasonal abundance patterns,peaking in summer and autumn,particularly in the inner bay,reflecting its adaptation to the eutrophic conditions and high food availability.Compared to laboratory results,O.dioica in Jiaozhou Bay exhibited shorter body lengths,smaller gonad volumes,and earlier maturation at reduced body sizes,despite high natural chlorophyll-a concentration,suggesting that factors beyond food availability,such as resource competition and environmental stressors,may limit its growth in natural settings.Correlation analysis indicated that the somatic growth of natural O.dioica was primarily influenced by temperature,while gonadal development was related to chlorophyll-a concentration,and its population abundance was linked to food availability and the abundance of other zooplankton,such as copepods and jellyfish.It was suggested that the growth and recruitment of O.dioica were constrained by resource limitations in natural environments,further exacerbated by interactions with other zooplankton,including predation and competition.This study provides valuable data on the mechanisms underlying bio-environmental interactions and their spatiotemporal variations,offering critical insights into the ecological roles of appendicularians in marine ecosystems.展开更多
Nutrients play a crucial role in sustaining marine ecosystems and supporting mariculture,especially in seaweed aquaculture.Currently,seaweed farming,such as kelp cultivation,is entirely dependent on the natural supply...Nutrients play a crucial role in sustaining marine ecosystems and supporting mariculture,especially in seaweed aquaculture.Currently,seaweed farming,such as kelp cultivation,is entirely dependent on the natural supply of nutrients.Sanggou Bay in Shandong Peninsula,Yellow Sea,is renowned for its 60-year history of kelp cultivation;however,it is recently facing an increasing demand for nitrogen and phosphorus due to the expansion in aquaculture scale and production.There is no doubt that nutrient addition can enhance and sustain the production,but it is crucial to understand its effect on kelp growth under current nutrients condition and the potential ecological risks.Our in-field nutrient enrichment experiments show that nitrogen and phosphorus additions promoted the kelp biomass during the early growth stages,and have no adverse effects on phytoplankton or seawater nutrient levels throughout the experiment.From a long-term perspective,increasing nutrient supply appears to be an essential strategy for sustaining the aquaculture of kelp.展开更多
Prydz Bay,East Antarctica,is a critical region for studying ocean–sea ice–ice shelf interactions and their role in the global climate system.This review synthesizes the advancements in numerical modeling of physical...Prydz Bay,East Antarctica,is a critical region for studying ocean–sea ice–ice shelf interactions and their role in the global climate system.This review synthesizes the advancements in numerical modeling of physical oceanographic processes in Prydz Bay,highlighting the evolution from early one-dimensional thermodynamic models to contemporary high-resolution,three-dimensional coupled ocean–sea ice–ice shelf frameworks.We discuss key milestones in understanding processes such as frazil ice dynamics and its impact on the basal mass balance of the Amery Ice Shelf,the pathways and mechanisms of Modified Circumpolar Deep Water intrusions,and the dynamic influences of large icebergs on regional circulation.Despite significant progress,challenges remain in integrating multi-component interactions and achieving long-term,high-resolution climate projections.Future efforts should focus on developing fully coupled models that incorporate atmosphere–ocean–sea ice–ice shelf–iceberg interactions,supported by enhanced observational networks and improved computational efficiency.This review underscores the importance of continued modeling advancement to better predict the responses of Antarctic ice shelves and polar climate to global change.展开更多
This paper takes the water body of Daliao River-Liaodong Bay as the research object,divides it into three regions:river,estuary,and offshore,and analyzes the changes of antibiotics and antibiotic resistance genes(ARGs...This paper takes the water body of Daliao River-Liaodong Bay as the research object,divides it into three regions:river,estuary,and offshore,and analyzes the changes of antibiotics and antibiotic resistance genes(ARGs)from inland rivers to the sea and the environmental impact factors from this perspective.The results showed that in general,the pollution of antibiotics and ARGs in Daliao River-Liaodong Bay belonged to the medium-low level,and levels of antibiotics and ARGs were nd–106.23 ng/L and nd–1.95×10^(8)copies/L,respectively.The concentrations and types of antibiotics and ARGs decreased from inland to sea regions.Analysis of the distributional characteristics of antibiotics and ARGs from a regionalized perspective revealed significant differences among the three regions in sulfonamide antibiotics,tetracycline antibiotics,and dominant ARGs.Sulfonamide antibiotic levels were significantly higher in the estuarine zone than in the riverine and offshore zones;tetracycline antibiotic levels were significantly higher in the riverine and estuarine zones than in the offshore zone.Aminoglycosides were dominant in the riverine and estuarine zones,and macrolides were dominant in the offshore zone.We characterized the effects of environmental factors on the assignment of antibiotics and ARGs and found that overall temperature contributed the most to variation in antibiotics and ARGs;the contribution of dissolved oxygen was the lowest.The estuarine zone was most affected by these factors,followed by the offshore zone and finally the riverine zone.展开更多
Carbon Capture,Utilization,and Storage(CCUS)technology has gained widespread attention in recent years as a critical strategy to combat global climate change,particularly in achieving carbon neutrality goals.The Guang...Carbon Capture,Utilization,and Storage(CCUS)technology has gained widespread attention in recent years as a critical strategy to combat global climate change,particularly in achieving carbon neutrality goals.The Guangdong-Hong Kong-Macao Greater Bay Area(GBA),as one of China's most economically active regions,serves as a key engine for economic growth while also facing considerable carbon emission challenges.This study analyzes the industrial emission volume and geographical distribution of key emitting enterprises in the GBA,summarizes their technological processes and main carbonemitting equipment,and provides scientific support for precise mitigation policies and low-carbon development.Based on data from 176 key emitting enterprises,the study reveals that Guangzhou and Dongguan host the largest number of such enterprises.Carbon emissions are primarily concentrated in the power sector,dominated by coal-and gas-fired power units,characterized by significant spatial dispersion and uneven distribution.Beyond the power sector,the paper industry has a high number of enterprises but lower emissions.Key facilities such as boilers,cogeneration systems,and production lines are predominantly located near tributaries rivers in Dongguan and Jiangmen.The building materials sector,primarily cement production,ranks as the second-largest emitter,with hightemperature kilns and grinding equipment,particularly rotary kilns and glass furnaces,as the main sources.The petrochemical and chemical sectors have fewer enterprises and lower emissions in the GBA,mainly located in suburban industrial clusters.Carbon emissions in the GBA exhibit distinct industry concentration and geographical distribution disparities.This study provides crucial data and theoretical insights for the development of targeted emission reduction strategies,optimization of source-sink matching,and the advancement of CCUS technologies in the region,particularly from the GBA to the northern South China Sea.展开更多
Reservoir is an important source of CO_(2) emissions.The backwater bay is a distinct hydrological unit formed in the open channel of canyon-reservoir as a result of impoundment.It is characterized by efficient nutrien...Reservoir is an important source of CO_(2) emissions.The backwater bay is a distinct hydrological unit formed in the open channel of canyon-reservoir as a result of impoundment.It is characterized by efficient nutrients retention and a propensity for frequent eutrophication.However,the spatio-temporal dynamics of CO_(2) emissions in these backwater bays remain unclear.This study investigated CO_(2) fluxes(fCO_(2))in two different backwater bays(Hanfeng Lake and Gaoyang Lake)within the Three Gorges Reservoir(TGR),to reveal the spatio-temporal dynamics and driving factors of CO_(2) emissions.The two backwater bays serve as minor sources of CO_(2) emissions,exhibiting lower fCO_(2) compared to other water areas within the TGR.In the subsiding and low water level periods of the TGR,the fCO_(2) in the two backwater bays were significantly lower,with some areas even converting into CO_(2) sinks due to extensive eutrophication.However,the water flow backward caused by the TGR water level elevation simultaneously enhances CO_(2) emissions by diluting algae density and constraining primary production.We highlighted that nutrients enrichment,eutrophication,and water level fluctuations co-dominate the temporal dynamics of CO_(2) emissions from backwater bays in the TGR.The CO_(2) fluxes decreased from upstream to downstream in the two backwater bays.The spatial distribution of nutrients and related algal density are critical factors driving this pattern.The key factors influencing CO_(2) emissions in the backwater bays diversified with water level fluctuations.Our findings contribute to a better understanding of CO_(2) emissions in large reservoirs with varying hydrological habitats.展开更多
文摘针对基于数据分发服务的分散式组网导航系统(decentralized networked navigation system based on DDS,DDS-DNNS)单定位节点状态估计问题,考虑节点能量约束及传感器增益退化,以Bayes理论为基础,设计了具有随机事件触发机制(stochastic event-triggered,SET)的DDS-DNNS最小均方误差状态估计器。其中,SET机制通过比较是否传输测量值对应的后验估计的差异来决定测量值的重要程度。以此为基础,选取Wasserstein距离作为度量来表示后验估计的差异,并利用Wasserstein距离的性质及Bayes定理证明了后验估计是Gaussian的,从而得到了估计器的类Kalman滤波递推形式以及SET机制的显式表达式。证明了估计器的预测误差协方差有界,且上界和下界均收敛,同时,证明了平均信息传输率有界并推导得到了上界和下界的表达式。利用算例仿真演示了如何通过平均信息传输率的上界和下界确定调整矩阵,模拟了SET机制中一阶矩信息和二阶矩信息对SET机制的影响,同时采用比较实验验证了估计器的有效性。
基金supported by the National Key Research and Development Program of China(Nos.2022YFF0801104 and 2021YFD1700600)the National Natural Science Foundation of China(No.51809177)the Science Foundation of Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences(No.NIGLAS2022GS08).
文摘Estuarine and bay ecosystems serve as crucial transitional zones for land-based pollutants entering the ocean.However,there is a critical gap in understanding the behavior of emerging pollutants in the numerous small estuaries and bays located in undeveloped coastal areas.This study provides insights into the fate of antibiotics in these small and scattered estuaries and bays in Shantou's coast,driven by land use types and hydrodynamic conditions.The findings indicated that estuaries were more heavily polluted with antibiotics than the bays(P<0.05),with tetracyclines and fluoroquinolones as the primary antibiotics.Antibiotic pollution levels were more severe in October than in June(P<0.01).Rainfall runoff,aquaculture tailwater,and river discharge were identified as the main sources of antibiotic pollution.Build-up land and aquaculture ponds were the primary land use types contributing to antibiotic pollution.The total antibiotic concentrations in June were positively correlated with the proportion of aquaculture ponds(P<0.05)and negatively correlated with the proportions of cropland and grassland(P<0.05).The concentrations of lomefloxacin and ofloxacin were positively correlated with build-up land.The antibiotic concentrations exhibited strong spatial heterogeneity within both bay and estuarine ecosystems driven by different hydrodynamic conditions.A comparative analysis of global estuaries and bays revealed that specific land-use types and hydrodynamic conditions produced similar trends in antibiotic fate.These insights offered new perspectives to safeguard the health of estuarine and bay ecosystems,such as altering landscape patterns and regulating aquaculture activities.
基金Supported by the National Key Research and Development Program of China(Nos.2023YFC3108205,2023YFC3108201)the National Natural Science Foundation of China(No.42306153)。
文摘Pelagic appendicularians,known for their rapid bloom capability,are important secondary producers and play essential roles in marine ecosystems.To assess the environmental adaptation of the most common appendicularian species Oikopleura dioica in Jiaozhou Bay,Shandong,China,its annual variations in abundance and body size were investigated monthly at 12 stations in 2011,and the relationship between somatic growth and gonadal development was compared with previously published laboratory data.Oikopleura dioica exhibited distinct seasonal abundance patterns,peaking in summer and autumn,particularly in the inner bay,reflecting its adaptation to the eutrophic conditions and high food availability.Compared to laboratory results,O.dioica in Jiaozhou Bay exhibited shorter body lengths,smaller gonad volumes,and earlier maturation at reduced body sizes,despite high natural chlorophyll-a concentration,suggesting that factors beyond food availability,such as resource competition and environmental stressors,may limit its growth in natural settings.Correlation analysis indicated that the somatic growth of natural O.dioica was primarily influenced by temperature,while gonadal development was related to chlorophyll-a concentration,and its population abundance was linked to food availability and the abundance of other zooplankton,such as copepods and jellyfish.It was suggested that the growth and recruitment of O.dioica were constrained by resource limitations in natural environments,further exacerbated by interactions with other zooplankton,including predation and competition.This study provides valuable data on the mechanisms underlying bio-environmental interactions and their spatiotemporal variations,offering critical insights into the ecological roles of appendicularians in marine ecosystems.
基金Supported by the Laoshan Laboratory(No.LSKJ202204005)the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA23050502)+2 种基金the State Key Program of National Natural Science Foundation of China(No.42130411)the International Science Partnership Program of the Chinese Academy of Sciences(Nos.121311KYSB20190029,133137KYSB20200002)the Key Deployment Project of Centre for Ocean Mega-Research of Science,Chinese Academy of Sciences(CAS)(No.COMS2019J03)。
文摘Nutrients play a crucial role in sustaining marine ecosystems and supporting mariculture,especially in seaweed aquaculture.Currently,seaweed farming,such as kelp cultivation,is entirely dependent on the natural supply of nutrients.Sanggou Bay in Shandong Peninsula,Yellow Sea,is renowned for its 60-year history of kelp cultivation;however,it is recently facing an increasing demand for nitrogen and phosphorus due to the expansion in aquaculture scale and production.There is no doubt that nutrient addition can enhance and sustain the production,but it is crucial to understand its effect on kelp growth under current nutrients condition and the potential ecological risks.Our in-field nutrient enrichment experiments show that nitrogen and phosphorus additions promoted the kelp biomass during the early growth stages,and have no adverse effects on phytoplankton or seawater nutrient levels throughout the experiment.From a long-term perspective,increasing nutrient supply appears to be an essential strategy for sustaining the aquaculture of kelp.
基金supported by the Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)(Grant nos.SML2021SP306,SML2023SP201)the National Key R&D Program of China(Grant no.2024YFF0506603)+1 种基金the National Natural Science Foundation of China(Grant no.42576020)Guangdong Basic and Applied Basic Research Foundation,China(Grant nos.2024A1515012717,2026A1515012241).
文摘Prydz Bay,East Antarctica,is a critical region for studying ocean–sea ice–ice shelf interactions and their role in the global climate system.This review synthesizes the advancements in numerical modeling of physical oceanographic processes in Prydz Bay,highlighting the evolution from early one-dimensional thermodynamic models to contemporary high-resolution,three-dimensional coupled ocean–sea ice–ice shelf frameworks.We discuss key milestones in understanding processes such as frazil ice dynamics and its impact on the basal mass balance of the Amery Ice Shelf,the pathways and mechanisms of Modified Circumpolar Deep Water intrusions,and the dynamic influences of large icebergs on regional circulation.Despite significant progress,challenges remain in integrating multi-component interactions and achieving long-term,high-resolution climate projections.Future efforts should focus on developing fully coupled models that incorporate atmosphere–ocean–sea ice–ice shelf–iceberg interactions,supported by enhanced observational networks and improved computational efficiency.This review underscores the importance of continued modeling advancement to better predict the responses of Antarctic ice shelves and polar climate to global change.
基金supported by the Key R&D Projects in Hainan Province(No.ZDYF2024SHFZ085)Hainan Provincial Joint Project of Sanya Yazhou Bay Science and the Technology City(No.2021CXLH0009)the National Natural Science Foundation of China(No.42376234).
文摘This paper takes the water body of Daliao River-Liaodong Bay as the research object,divides it into three regions:river,estuary,and offshore,and analyzes the changes of antibiotics and antibiotic resistance genes(ARGs)from inland rivers to the sea and the environmental impact factors from this perspective.The results showed that in general,the pollution of antibiotics and ARGs in Daliao River-Liaodong Bay belonged to the medium-low level,and levels of antibiotics and ARGs were nd–106.23 ng/L and nd–1.95×10^(8)copies/L,respectively.The concentrations and types of antibiotics and ARGs decreased from inland to sea regions.Analysis of the distributional characteristics of antibiotics and ARGs from a regionalized perspective revealed significant differences among the three regions in sulfonamide antibiotics,tetracycline antibiotics,and dominant ARGs.Sulfonamide antibiotic levels were significantly higher in the estuarine zone than in the riverine and offshore zones;tetracycline antibiotic levels were significantly higher in the riverine and estuarine zones than in the offshore zone.Aminoglycosides were dominant in the riverine and estuarine zones,and macrolides were dominant in the offshore zone.We characterized the effects of environmental factors on the assignment of antibiotics and ARGs and found that overall temperature contributed the most to variation in antibiotics and ARGs;the contribution of dissolved oxygen was the lowest.The estuarine zone was most affected by these factors,followed by the offshore zone and finally the riverine zone.
基金supported by the National Natural Science Foundation of China(52304098,52106092,42376215,52474105)Shenzhen Science and Technology Program(JCYJ20220818095605012,JCYJ20220530113011027)+5 种基金Guangdong Basic and Applied Basic Research Foundation(2022A1515110338,2023A1515012316,2023A1515012761,2025A1515010748)Research Team Cultivation Program of Shenzhen University(2023QNT004)Shenzhen Key Laboratory of Natural Gas Hydrates(ZDSYS20200421111201738)the General Research Fund(No.12616222)Early Career Scheme(No.22611624)of Hong Kong Research Grants CouncilMajor Science and Technology Infrastructure Project of Material Genome Big–science Facilities Platform supported by the Municipal Development and Reform Commission of Shenzhen。
文摘Carbon Capture,Utilization,and Storage(CCUS)technology has gained widespread attention in recent years as a critical strategy to combat global climate change,particularly in achieving carbon neutrality goals.The Guangdong-Hong Kong-Macao Greater Bay Area(GBA),as one of China's most economically active regions,serves as a key engine for economic growth while also facing considerable carbon emission challenges.This study analyzes the industrial emission volume and geographical distribution of key emitting enterprises in the GBA,summarizes their technological processes and main carbonemitting equipment,and provides scientific support for precise mitigation policies and low-carbon development.Based on data from 176 key emitting enterprises,the study reveals that Guangzhou and Dongguan host the largest number of such enterprises.Carbon emissions are primarily concentrated in the power sector,dominated by coal-and gas-fired power units,characterized by significant spatial dispersion and uneven distribution.Beyond the power sector,the paper industry has a high number of enterprises but lower emissions.Key facilities such as boilers,cogeneration systems,and production lines are predominantly located near tributaries rivers in Dongguan and Jiangmen.The building materials sector,primarily cement production,ranks as the second-largest emitter,with hightemperature kilns and grinding equipment,particularly rotary kilns and glass furnaces,as the main sources.The petrochemical and chemical sectors have fewer enterprises and lower emissions in the GBA,mainly located in suburban industrial clusters.Carbon emissions in the GBA exhibit distinct industry concentration and geographical distribution disparities.This study provides crucial data and theoretical insights for the development of targeted emission reduction strategies,optimization of source-sink matching,and the advancement of CCUS technologies in the region,particularly from the GBA to the northern South China Sea.
基金supported by the National Natural Science Foundation of China(Nos.32371680 and 41807321)Chongqing Natural Science Foundation of China(Nos.CSTB2023NSCQ-LZX0150 and 2022NSCQMSX2598)the Science and Technology Research Program of Chongqing Education Commission of China(Nos.KJQN202200536 and KJQN202203222).
文摘Reservoir is an important source of CO_(2) emissions.The backwater bay is a distinct hydrological unit formed in the open channel of canyon-reservoir as a result of impoundment.It is characterized by efficient nutrients retention and a propensity for frequent eutrophication.However,the spatio-temporal dynamics of CO_(2) emissions in these backwater bays remain unclear.This study investigated CO_(2) fluxes(fCO_(2))in two different backwater bays(Hanfeng Lake and Gaoyang Lake)within the Three Gorges Reservoir(TGR),to reveal the spatio-temporal dynamics and driving factors of CO_(2) emissions.The two backwater bays serve as minor sources of CO_(2) emissions,exhibiting lower fCO_(2) compared to other water areas within the TGR.In the subsiding and low water level periods of the TGR,the fCO_(2) in the two backwater bays were significantly lower,with some areas even converting into CO_(2) sinks due to extensive eutrophication.However,the water flow backward caused by the TGR water level elevation simultaneously enhances CO_(2) emissions by diluting algae density and constraining primary production.We highlighted that nutrients enrichment,eutrophication,and water level fluctuations co-dominate the temporal dynamics of CO_(2) emissions from backwater bays in the TGR.The CO_(2) fluxes decreased from upstream to downstream in the two backwater bays.The spatial distribution of nutrients and related algal density are critical factors driving this pattern.The key factors influencing CO_(2) emissions in the backwater bays diversified with water level fluctuations.Our findings contribute to a better understanding of CO_(2) emissions in large reservoirs with varying hydrological habitats.
