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Benefit for inversion of long-term satellite daily temperature based on multi-machine learning algorithms

Atmospheric Research 2025年 325卷

作者： Zhu, Xiaochen Jiao, Guanjie Li, Qiangyu Qiu, Rangjian Jiangsu Provincial University Key Laboratory of Agricultural and Ecological Meteorology School of Ecology and Applied Meteorology Nanjing University of Information Science and Technology Nanjing210044 China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing210044 China Department of Natural Resources and the Environment University of Connecticut Storrs06269 United States State Key Laboratory of Water Resources Engineering and Management School of Water Resources and Hydropower Engineering Wuhan University Wuhan430072 China

The Advanced Very High-Resolution Radiometer (AVHRR), a satellite sensor has been in orbit for over 40 years, providing remote sensing images before 2000 and there is considerable room for improvement in the accuracy of current air temperature (Ta) inversions based on AVHRR to obtain accurate long-term Ta data before 2000. Here, we aim to estimate daily average (Tave), maximum (Tmax), and minimum (Tmin) air temperatures at a resolution of 5 km for the Chinese region during the period 1983–2000. We developed a satellite-retrieval daily temperature extrapolation method based on machine learning (ML) combining multiple sources of big data, i.e., leveraging comprehensive and gap-free land surface temperature data from remote sensing along with other relevant variables from reanalysis data, topography and auxiliary data of local temperature, to generate extended time series of high-resolution Ta data. Quality validation results indicate that the ML can enhance the accuracy of Ta inversion with average error range of various ML methods being 0.995–1.606 °C, 1.316–1.971 °C and 1.396–1.980 °C for Tave, Tmax, and Tmin, respectively, which is better than the 2.297 ± 1.704 °C, 3.294 ± 2.016 °C and 2.873 ± 1.666 °C of ERA5. Integrated ML method outperforms individual algorithms, yielding a high correlation coefficient of 0.96 and a robust mean error of 1 °C. The spatial distribution of newly daily Ta data from the multi-ML nationwide and local region is homogeneous with ERA5, indicating high physical consistency, and has higher resolution of 5 km. These updated temperature data can be beneficial in better revealing intricate structural attributes on a regional scale, as well as exploring urban heat islands. © 2024

关键词： Multi-task learning

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Deciphering the anammox microbial community succession with humic acid exposure to optimize large anammox granules for robust nitrogen removal

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Chemosphere 2024年 363卷 142905页

作者： Liu, Changqing Yu, Jianghua Zhu, Xinxin Shi, Haoqian Wang, Xin Sun, Dongxiao Dong, Zhiqiang Zhu, Yijing Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Nanjing University of Information Science & Technology Nanjing210044 China China Railway Shanghai Engineering Group Municipal Environmental Protection Co. Ltd Shanghai201906 China College of Environmental Science and Engineering Tongji University Shanghai200092 China

The robustness of the anaerobic ammonia oxidation (anammox) process in treating wastewater with high concentrations of humic acids (HAs), including landfill leachate and sludge anaerobic digestion liquid, has been paid great attention. This study revealed that the anammox sludge granule size of 1.0–2.0 mm could be robust under the HA exposure with high concentrations. The total nitrogen removal efficiency (NRE) was 96.2% at the HA concentration of 20–100 mg/L, while the NRE was 88.5% at the HA concentration of 500 mg/L, with reduced by 7.7%. The increased extracellular polymeric substances (EPS) content which was stimulated by the HA exposure favored the formation of large granules (1.0–2.0 mm) by enveloping medium and micro granules (0.2–1.0 mm). The abundance of anammox bacteria Candidatus Brocadia was found to be higher (14.2%) in large anammox granules sized 1.0–2.0 mm, suggesting a potentially high anammox activity. However, the abundance of denitrifiers Denitratisoma increased by 4.3% in ultra-large anammox granules sized >2.0 mm, which could be attributed to the high EPS content for heterotrophic denitrifiers metabolism as organic matter. The feedback mechanism of the anammox community for maintaining the ecological function under the HA exposure resulted in a closely related microbial community, with positive and negative correlations in the ecological network increased by 64.3%. This study revealed that the HA exposure of the anammox system resulted in the anammox granules of 1.0–2.0 mm size being the dominant granules with robust nitrogen removal, providing significant guidance for the optimization of anammox granules for an efficient treatment of HA-containing wastewater in anammox applications. © 2024 Elsevier Ltd

关键词： Nitrogen removal

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Pilot study on ceramic flat membrane bioreactor in treatment of coal chemical wastewater

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Chemosphere 2024年 347卷 140701页

作者： Shi, Jingxin Wang, Yarui Lu, Simin Wang, Jiahui Liu, Jingchun Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science & Technology Nanjing210044 China Changwang School of Honors Nanjing University of Information Science & Technology Nanjing210044 China College of Environment South China Normal University Guangzhou510006 China Co. Ltd Shanghai744000 China

Some toxic and refractory pollutants in coal chemical wastewater can penetrate the biochemical treatment systems and cause high concentrations of suspended solids in the effluent, which may obstruct the subsequent advanced treatment. In this project, a submerged ceramic plate membrane system was integrated to the last oxic corridor of an existing multistage anoxic/oxic tank. In the ceramic flat membrane bioreactor, the influent chemical oxygen demand (COD) was 102.24–178.88 mg/L, with a removal ratio of approximately 30%. The NH3–N concentration in the effluent was relatively stable with an average value of 1.76 mg/L. The turbidity of the effluent was in the range of 0.235–0.852 NTU and was stable below 1 NTU. A flux of 30 L m−2·h−1 could meet the requirements of the pilot test. A gas-water ratio of 50:1 was found optimal. When the concentration of mixed liquor suspended solids (MLSS) was >3769 mg/L, the extracellular polymeric substance in the mixed solution was utilized by microorganisms as a substrate. High MLSS decreased membrane fouling rate. NaClO backwashing can effectively remove pollutants without adversely affecting the treatment efficiency of membrane bioreactors. © 2023 Elsevier Ltd

关键词： Bioreactors

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Effect of Zinc Oxide Nanoparticles on Denitrification and Denitrifying Bacteria Communities in Typical Estuarine Sediments

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Journal of Ocean University of China 2021年第3期20卷 599-607页

作者： CHEN Xi XIANG Zhuangzhuang REN Zhaomeng HUANG Xiao LI Hui SUN Pengfei BAI Jie College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China College of Marine Life Sciences Ocean University of ChinaQingdao 266003China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlSchool of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China Key Laboratory of Marine Environmental Science and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China

For revealing the effects of increasing of zinc oxide nanoparticles(ZnO NPs)on denitrification and denitrifying bacteria communities in estuarine sediments,the surface sediments of two typical estuaries(the Yangtze River Estuary and the Yellow River Estuary)were added with medium concentration(170mgL−1)and high concentration(1700mgL−1)of ZnO NPs for anaerobic cul-ture in *** concentration of NO_(3)^(−)and NO_(2)^(−),the reductase activity and denitrification rate were measured by physico-chemical analysis,nirS gene abundance and denitrifying bacteria communities by molecular biological *** results showed that ZnO NPs inhibited NO_(3)^(−), NO_(2)^(−)reduction process and NO_(3)^(−), NO_(2)^(−)reductase activity,and a stronger inhibition effect resulting from the higher ZnO NPs *** NPs decreased nirS gene abundance and community diversity of denitrifying *** addition,the inhibition degree of ZnO NPs on the denitrification process of sediments in different estuaries was *** results were of great significance for evaluating the potential ecological toxicity and risks of nanomaterials in estuaries.

关键词： zinc oxide nanoparticles denitrification denitrifying bacteria community estuarine sediments

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The Transition and Suggestions of Coastal Port Reclamation Policy in China

SSRN

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SSRN 2022年

作者： Wang, Nan Zhu, Gaoru Li, Xinyang Xu, Min Cheng, Jinxiang Yi, Wenbin Liu, Shengqiang Xie, Zhenglei College of Marine Science and Engineering Nanjing Normal University Jiangsu Nanjing China Laboratory of Transport Pollution Control and Monitoring Technology Transport Planning and Research Institute Ministry of Transport of the People’s Republic of China Beijing100028 China Key Laboratory of Coastal Salt Marsh Ecosystems and Resources Ministry of Natural Resources Nanjing210023 China Building 2 Jia 6 Shuangguangxili Chaoyang Beijing100028 China

China has the largest extent of reclamation in the world with an area of 2976 km2 from 2002 to 2018. The coastal reclamation was used for saltpan purposes in the 1950s and was applied for agriculture in the 1960s and 1970s. The aquatic products of China occupied large scale coastal wetland and provides huge amounts of fishes. Since 2000, the reclamation was used for port, industries and urban expansion. Ports are the key to land-sea coordination and regional development, and the study of port reclamation patterns and environmental strategies for port clusters is the focus of coastal zone sustainable development. Port is the only one type that depend on reclamation and port play an important role in driving economic development and world trades. Port reclamation in China has undergone several phases of acceleration, peak, deceleration, and stagnation since 2002. This research demonstrated the reclamation policy changes. New situation of port reclamation, such as the stronger demand for port reclamation and strict reclamation policies, ecological demands of port reclamation, the different reclamation stages, unbalanced spatial-temporal distribution of reclamation, coordination of reclamation-related policies, and imbalance between filling and dredging, were demonstrated. In the end, the research shows land use efficiency needs to be improved, the ecological restoration level should be enhanced, and the port reclamation model should be changed, port plan revision and land-sea integration should be improved. Therefore, the research has important implication for scientifically regulating the spatial pattern of port reclamation, and promoting the sustainable development of port-dense coastal zone. © 2022, The Authors. All rights reserved.

关键词： Reclamation

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Modeling Assessment of Air pollution control Measures and Covid-19 Pandemic on Air Quality Improvements Over Greater Bay Area of China

SSRN

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SSRN 2024年

作者： Wang, Shaoyi Zhu, Yun Jang, Ji-Cheng Jiang, Ming Yue, Dingli Zhong, Liuju Yuan, Yingzhi Zhang, Mengmeng You, Zhiqiang Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control College of Environment and Energy South China University of Technology Guangzhou Higher Education Mega Center Guangzhou510006 China Guangdong Ecological and Environmental Monitoring Center Guangzhou510308 China Guangdong Polytechnic of Environmental Protection Engineering Foshan528216 China

A remarkable progress has been made toward the air quality improvements over the Guangdong-Hong Kong-Macao Greater Bay Area (GBA) of China from 2017 to 2020. In this study, for the first time, the emission reductions of regional control measures together with the COVID-19 pandemic were considered simultaneously into the development of the GBA's emission inventories for the years of 2017 and 2020. Based on these collective emission inventories, the impacts of control measures, meteorological variations together with temporary COVID-19 lockdowns on the five leading air quality index pollutants (SO2, NO2, PM2.5, PM10, and O3) were evaluated using the WRF-CMAQ and SMAT-CE model attainment assessment tool over the GBA region. Our results revealed that control measures in the Pearl River Delta (PRD) region affected significantly the GBA, resulting in pollutant reductions ranging from 48% to 64%. In contrast, control measures in Hong Kong and Macao contributed to pollutant reductions up to 10%. In PRD emission sectors, stationary combustion, on-road, industrial processes and dust sectors stand out as the primary contributors to overall air quality improvements. Moreover, the COVID-19 pandemic during period I (Jan 23-Feb 23) led to a reduction of NO2 emissions by 7.4%, resulting in a negative contribution (disbenefit) for O3 with an increase by 2.4%. Our findings highlight the significance of PRD control measures for the air quality improvements over the GBA, emphasizing the necessity of implementing more refined and easily manageable joint prevention and control policies. © 2024, The Authors. All rights reserved.

关键词： COVID-19

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A comprehensive analysis of O₃ variation and source contributions of VOCs-oriented to O₃ pollution episodes over Jinan city, China

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Atmospheric pollution Research 2025年第8期16卷

作者： Fan, Lianhuan Gu, Shumao Yan, Huaizhong Zhang, Junxiao Zhang, Miao Wei, Xiaofeng Zhang, Guiqin Key Laboratory of Beijing on Regional Air Pollution Control College of Environmental Science and Engineering Beijing University of Technology Beijing China School of Municipal and Environmental Engineering Shandong Jianzhu University Shandong Jinan China Shandong Provincial Eco-environment Monitoring Center Shandong Jinan China

Although severe ozone (O3) pollution has been frequently observed during summer over Jinan city in northern China, which underscores the necessity of mitigating O3 pollution, the key formation processes and prominent ... 详细信息

Although severe ozone (O₃) pollution has been frequently observed during summer over Jinan city in northern China, which underscores the necessity of mitigating O₃ pollution, the key formation processes and prominent sources of O₃ pollution episode remain poorly characterized. In this study, the Weather Research and Forecasting (WRF)-Community Multiscale Air Quality (CMAQ) modeling system was employed to investigate the formation mechanism of O₃ pollution during summer in Jinan. In addition, the Integrated Source Apportionment Method (ISAM) was subsequently applied to determine the major VOCs contributors to elevated O₃ levels. During O₃ pollution episodes, increased O₃ concentrations generated by gas-chemistry at high altitudes were transported to the ground through vertical transport, exacerbating surface-level O₃ pollution caused by photochemical reactions during daytime. The declined height of the planetary boundary layer (PBLH) and vertical mixing, which form O₃-rich residual layers, were identified as the key drivers of the O₃ accumulation and enhancement near the surface during nighttime. Furthermore, ISAM results indicate that terminal olefin carbon bonds (OLE), internal olefin carbon bonds (IOLE), and ethene (ETH) playing essential roles in O₃ formation, collectively contributing up to 60 %. This implicates great importance of vehicle exhaust and the use of liquefied petroleum gas (LPG) and natural gas (NG) over Jinan city. Our findings offer possible explanations for O₃ pollution episode and provide a quantitative understanding of O₃ source apportionment, guiding the control strategy of VOCs-oriented on O₃ mitigation. © 2025 Turkish National Committee for Air pollution Research and control

关键词： Active VOCs contributions CMAQ-ISAM model Formation process analysis Ozone pollution characteristics Source apportionment

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Antibiotic Resistant Bacteria Inactivation Through Electro-Fenton Disinfection with Carbon Catalysts and its Potential Risks

SSRN

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SSRN 2022年

作者： Zuo, XiaoJun Cao, WenXing Li, Yang Wang, Tao Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science & Technology Nanjing210044 China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Joint Laboratory of Atmospheric Pollution Control Nanjing210044 China School of Environment Engineering Wuxi University Wuxi214105 China

Recently, increasing attention has been paid to the inactivation of antibiotic resistant bacteria (ARB) during electrochemical oxidation processes. However, no available information could be found on ARB inactivation during metal-free electro-Fenton (EF) disinfection. In this study, PVDF-based carbon catalyst (PPC) was chosen as the working electrode, and batch experiments were conducted to investigate key design for ARB inactivation, effects of water matrix and potential risks after the EF disinfection under the pre-determined conditions. ARB inactivation was the largest (5.0 log reduction for 40 min) through the used EF disinfection with current density at 2.25 mA/cm2 and Air/Water ratio of 10:1, which was in line with the profile and yield of H2O2 during the disinfection. Effects of water matrix analysis implied that ARB inactivation efficiencies during the EF disinfection in acidic solutions were better than the one in alkaline solutions under the optimal conductivity of 8000 μs/cm, which could be due to rich C=C levels on surface of PPC cathode. After the EF disinfection for 40 min, ARB counts increased slightly at the first 2 hr and then tended to disappear, and there were no ARGs conjugation transfer and little transformation, indicating that 40min of EF disinfection process was adequate to block the potential risk of ARB. Furthermore, the sequencing batch operation was more suitable for the inactivation of ARB by EF disinfection with carbon materials than the continuous operation. © 2022, The Authors. All rights reserved.

关键词： Disinfection

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Characterization of Nitrated Aromatic Compounds in Fine Particles from Nanjing, China: Optical Properties, Source Allocation, and Evolutionary Processes

SSRN

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SSRN 2022年

作者： Cao, Maoyu Yu, Wentao Chen, Meijuan Chen, Mindong Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science & Technology Nanjing210044 China

Recently, nitrated aromatic compounds (NACs) have received much attention due to their role as key chromophores of brown carbon (BrC) and their impact on human health and the climate. In this study, a method for rapid detection of 12 NACs in the atmosphere was developed and applied to the detection of 191 atmospheric samples in the northern suburbs of Nanjing in 2017. The total NACs showed obvious seasonal variation, with a concentration sequence of winter>autumn>spring>summer. Moreover, the component proportions of NACs also changed with the seasons. Nitrophenols (NPs) and nitrocatechols (NCs) were most abundant in winter, while nitrosalicylic acids (NSAs) were more abundant in summer. The reason for this result may be due to the different sources of dominance of NACs in different seasons. The light absorption of NACs to water-soluble BrC was mainly concentrated in the 300–400 nm range, and its contribution reached the maximum at 310 nm. The ability of different components to contribute to water-soluble BrC varied with seasons, with 4NP being the most important contributor. Positive Matrix Factorization (PMF) was applied to analyze the dominant source of NACs in different seasons, and the results showed that secondary generation was the most important source of NACs. The secondary generation of NACs was affected by nitrogen dioxide (NO2). Under the condition of high NO2 (＞ 20 ppb), NACs increased with the increase of NO2. The formation advantage of inorganic NO3 in the environment was higher than that of NACs at NO2 >20 ppb. In addition, NPs were more susceptible to photolysis due to the influence of temperature. © 2022, The Authors. All rights reserved.

关键词： Light absorption

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Waste sludge disintegration, methanogenesis and final disposal via various pretreatments: Comparison of performance and effectiveness

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Environmental Science and Ecotechnology 2021年第4期8卷 119-129页

作者： Haiyang He Xiaodong Xin Wei Qiu Dong Li Zhicen Liu Jun Ma State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090China Department of Environmental Science and Engineering Huaqiao UniversityXiamen361021China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlSchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing210044China School of Geosciences The University of EdinburghEdinburghEH89JUUK

This study compared the three wastewater pretreatments of ozonation,Fe2þ-S2O82and freeze-thawing(F/T)in the disintegration,anaerobic digestion(AD)and final disposal of the *** F/T pretreatment increased the dewaterability and settleability of the sludge by 7.8%and 47.1%,*** ozonation pretreatment formed more volatile fatty acids(VFAs),with a peak value of 320.82 mg SCOD/L and controlled the release of *** Fe2þ-S2O82pretreatment removed heavy metals through the absorption and flocculation of ferric particles formed *** the anaerobic digestion of the sludge,the ozonation pretreatment accelerated the hydrolysis rate(k)rather than the biochemical methane potential(B0)of the sludge due to the high VFA content in the ***,the F/T pretreatment facilitated the B0 with great economic efficiency by enhancing the solubilisation of the *** Fe2þ-S2O82pretreatment decreased the methane production,the ferric particle was a unique advantage in the disintegration and harmless disposal of the *** digested sludge had more VFAs after ozonation pretreatment,which contributed to the recycling of *** addition,the lower sludge volume could save the expense of transportation and disposal by ozonation *** pretreatments had different *** comparative study provided information allowing the selection of the type of pretreatment to achieve different objectives of the treatment and disposal of sludge.

关键词： Sludge disintegration Anaerobic sludge digestion Effectiveness comparison Different pretreatments

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