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Temperature dependence of the rain-gas and snow-gas partition coefficients for nearly a thousand chemicals

Chemosphere 2024年 362卷 142565页

作者： Yang, Pu-Fei Ma, Wan-Li Xiao, Hang Hansen, Kaj M. Wang, Liang Sun, Jing-Jing Liu, Li-Yan Zhang, Zi-Feng Jia, Hong-Liang Li, Yi-Fan State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin150090 China Harbin150090 China Harbin150090 China Department of Environmental Science Aarhus University Roskilde4000 Denmark Key Laboratory of Urban Environment and Health Ningbo Observation and Research Station Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control CAS Haixi Industrial Technology Innovation Center in Beilun Ningbo315800 China Laboratory of Marine Ecological Environment Early Warning and Monitoring Third Institute of Oceanography Ministry of Natural Resources Xiamen361005 China College of Environmental Science and Engineering Dalian Maritime University Dalian116026 China IJRC-PTS-NA TorontoONM2J 3N8 Canada

Compared to the particle-gas partition coefficients (KPG), the rain-gas (KRG) and snow-gas (KSG) partition coefficients are also essential in studying the environmental behavior and fate of chemicals in the atmosphere. While the temperature dependence for the KPG have been extensively studied, the study for KRG and KSG are still lacking. Adsorption coefficients between water surface-air (KIA) and snow surface-air (KJA), as well as partition coefficients between water-air (KWA) and octanol-air (KOA) are vital in calculating KRG and KSG. These four basic adsorption and partition coefficients are also temperature-dependent, given by the well-known two-parameters Antoine equation logKXY = AXY + BXY/T, where KXY is the adsorption or partition coefficients, AXY and BXY are Antoine parameters (XY stand for IA, JA, WA, and OA), and T is the temperature in Kelvin. In this study, the parameters AXY and BXY are calculated for 943 chemicals, and logKXY can be estimated at any ambient temperature for these chemicals using these Antoine parameters. The results are evaluated by comparing these data with published experimental and modeled data, and the results show reasonable accuracy. Based on these coefficients, temperature-dependence of logKRG and logKSG is studied. It is found that both logKRG and logKSG are linearly related to 1/T, and Antoine parameters for logKRG and logKSG are also estimated. Distributions of the 943 chemicals in the atmospheric phases (gas, particle, and rain/snow), are illustrated in a Chemical Space Map. The findings reveal that, at environmental temperatures and precipitation days, the dominant state for the majority of chemicals is the gaseous phase. All the AXY and BXY values for logKSG, logKRG, and basic adsorption and partition coefficients, both modeled by this study and collected from published work, are systematically organized into an accessible dataset for public utilization. © 2024 Elsevier Ltd

关键词： Rain

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The Effect of Nitrous Acid (Hono) on Ozone Formation During pollution Episodes in Southeastern China: Results from Model Improvement and Mechanism Insights

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SSRN 2023年

作者： Hu, Baoye Chen, Gaojie Chen, Jinsheng Xu, Lingling Fan, Xiaolong Hong, Youwei Li, Mengren Lin, Ziyi Huang, Mingqiang Zhang, Fuwang Wang, Hong Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences Xiamen China College of Chemistry Chemical Engineering and Environment Minnan Normal University Zhangzhou363000 China Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology Minnan Normal University Zhangzhou363000 China Fujian Province University Key Laboratory of Pollution Monitoring and Control Minnan Normal University Zhangzhou363000 China Key Lab of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences Xiamen China University of Chinese Academy of Sciences Beijing China Environmental Monitoring Center of Fujian Fuzhou China Fujian Meteorological Science Institute Fujian Key Laboratory of Severe Weather Fuzhou China

Two ozone (O3) processes, summer episode dominated by local production with IOA=0.94 and autumn episode dominated by regional transport with IOA=0.60, were chosen to investigate the role of HONO in different pollution processes. The gaps between observations and simulation results with the default HONO chemistry in Master Chemical Mechanism (MCM) of Observation Based Model (OBM) were higher in summer episode (0.58 ppb) than autumn episode (0.37 ppb). Although we implemented nine additional sources in the model to revise the HONO chemistry, the simulated values are still lower than the observed values. The maximum differences of OH with or without HONO constraints appeared at 9:00 (0.72×107 molecules×cm-3) and 12:00 (0.43×107 molecules×cm-3) for summer O3 episode and autumn O3 episode, respectively, which indicated that OH concentration would be underestimated if no measurement data available. HONO promoted production of O3 by HO2+NO and RO2+NO, and promoted loss of O3 by the reaction of OH+NO2, followed by RO2+NO2. The net production rate of O3 with HONO constraint increased 28.50% in summer and 22.43% in autumn, which also indicated that HONO played more important role in the O3 production in summer. The difference of NOx of daily RIR between with and without HONO constraint was higher in summer O3 episode (0.15 %/%) than that in autumn O3 episode (0.09 %/%), the same as to VOCs with -0.20 %/% in summer O3 episode and -0.14 %/% in autumn O3 episode, which indicated that the presence or absence of the HONO constraint has a greater impact on the RIR value in the case of dominant local generation. Therefore, the O3 sensitivity would be more favorable for VOCs without HONO constrained in the model, which could unavoidably mislead policy makers to develop efficient policies to control O3 pollution especially in the O3 episode dominant by local production. © 2023, The Authors. All rights reserved.

关键词： Ozone

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Core-shell [email protected] 2 O encapsulated Ag NPs nanocomposites for photooxidation-adsorption of iodide anions under visible light

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Separation and Purification technology 2021年 262卷

作者： Jiuyu Chen Aotian Gu Elvis Djam Miensah Ying Liu Peng Wang Ping Mao Chunhui Gong Yan Jiao Kai Chen Zongxiang Zhang Yi Yang Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing 210094 China Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province Faculty of Chemical Engineering Huaiyin Institute of Technology Huaian 223003 China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control (AEMPC) Nanjing University of Information Science & Technology Nanjing 210044 China Jiangsu Environmental Protection Key Laboratory of Monitoring for Organic Pollutants in Soil Taizhou Environmental Monitoring Center Taizhou 225300 China

Iodide anion (I − ) is one of the most-problematic radioactive nuclides in used nuclear fuel due to its intrinsic characteristics of a high toxicity and environmental mobility. Therefore, effective and selective elimination of I − from nuclear contaminated solution is highly beneficial for the pollution remediation purposes in the development of nuclear power, but is of significant challenge owing to the extreme conditions of the high acidity, strong ionizing radiation field and high concentration of competing anions. Herein, a novel core–shell [email protected] 2 O (ZC) encapsulated Ag nanoparticles (Ag NPs) nanocomposites have been fabricated via a facile one step self-assembly process and an environmentally friendly technique. The as-fabricated [email protected] @Cu 2 O (ZAC) nanocomposites were characterized and applied to capture of I − from aqueous solution. Adsorption studies revealed that the ternary nanocomposites showed fast removal kinetics, high photooxidation-adsorption capacity (up to 217.4 mg g −1 at pH = 3 for ZAC-2), satisfactory selectivity and high acidity resistance. Furthermore, the nanocomposites also exhibited a good reusability, as no significant change in the uptake capacity was observed even after five adsorption-regeneration cycles. Inspired by the superior features, a possible mechanism (chemical adsorption coupled with photooxidations) was proposed based on XRD, XPS and Raman spectra analysis for the pre- and post-adsorbed samples as well as the detailed adsorption experimental evidence.

关键词： Iodide anions Core–shell [email protected] 2 O [email protected] @Cu 2 O Photooxidation-adsorption

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Quenching Residual H2o2 From Uv/H2o2 With Granular Activated Carbon: A Significant Impact Of Bicarbonate

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SSRN 2023年

作者： Zeng, Jinfeng Zhang, Miao Qin, Xinxin He, Yi Liu, Xinyue Zhu, Yichun Liu, Zuwen Li, Wentao Dong, Huiyu Qiang, Zhimin Lian, Junfeng Jiangxi Provincial Key Laboratory of Water Ecological Conservation at Headwater Regions Jiangxi University of Science and Technology 1958 Ke-jia Road Ganzhou341000 China Ganzhou Key Laboratory of Basin Pollution Simulation and Control Jiangxi University of Science and Technology 1958 Ke-jia Road Ganzhou341000 China National－local Joint Engineering Laboratory of Water Engineering Safety and Efficient Utilization of Resources in Poyang Lake Watershed Nanchang Institute of Technology Nanchang330099 China KeyLaboratoryofDrinkingWaterScienceandTechnology ResearchCenterforEcoEnvironmental Sciences Chinese Academy of Sciences 18 Shuang-qing Road Beijing100085 China Hydrology and Water Resources Monitoring Center for Ganjiang Upstream Watershed 8 Zhang-jia-wei Road Ganzhou341000 China

UV/H2O2 has been used as an advanced oxidation process to remove organic micropollutants from drinking water. Residual H2O2 should be quenched to avoid potential damage to the distribution system or disinfectant wastage during the subsequent chlorination/chloramination process. Granular activated carbon (GAC) filter can quench the residual oxidant and eliminate some of the dissolved organic matter. However, knowledge on the kinetics and governing factors of GAC quenching of residual H2O2 from UV/H2O2 and the mechanism underlying the enhancement of the process by HCO3– is limited. Therefore, this study aimed to analyse the kinetics and influential factors, particularly the significant impact of bicarbonate (HCO3–). H2O2 decomposition by GAC followed first-order kinetics, and the rate constants normalised by the GAC dosage (kn) were steady (1.6 × 10–3 L g–1 min–1) with variations in the GAC dosage and initial H2O2 concentration. Alkaline conditions favour H2O2 quenching. Basic groups of the GAC contributed more to H2O2 quenching than did acidic groups, with their specific kn values being 8.9 and 2.4 min–1 M–1, respectively. The presence of chloride, sulphate, nitrate, and dissolved organic matter inhibited H2O2 quenching, while HCO3– promoted it. The interfacial hydroxyl radical (HO•) zones were visualised on the GAC surface, and HCO3– addition increased the HO• concentration. HCO3– increased the concentration of persistent free radicals (PFRs) on the GAC surface, which mainly contributed to HO• generation. A significant enhancement of HCO3– on H2O2 quenching by GAC was also verified in real water. This study revealed the synergistic mechanism of HCO3– and GAC on H2O2 quenching and presents the potential applications of residual H2O2 in the H2O2-based oxidation processes. © 2023, The Authors. All rights reserved.

关键词： Sulfur compounds

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Classification of aerosols using particle linear depolarization ratio (PLDR) over seven urban locations of Asia

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Chemosphere 2024年 350卷 141119页

作者： Tariq, Salman Nisa, Aiman ul-Haq, Zia Mariam, Ayesha Murshed, Muntasir Sulaymon, Ishaq Dimeji Salam, Mohammed Abdus Mehmood, Usman Department of Space Science University of the Punjab Lahore Pakistan Centre for Remote Sensing University of the Punjab Lahore Pakistan Department of Economics School of Business and Economics North South University Dhaka1229 Bangladesh Department of Journalism Media and Communications Daffodil International University Dhaka Bangladesh 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 and Technology Nanjing210044 China Department of Environmental Science and Disaster Management Noakhali Science and Technology University Noakhali3814 Bangladesh Department of Business Administration Bahçeşehir Cyprus University Northern Cyprus Nicosia Turkey

Active lidar remote sensing has been used to obtain detailed and quantitative information about the properties of aerosols. We have analyzed the spatio-temporal classification of aerosols using the parameters of particle linear depolarization ratio and single scattering albedo from Aerosol Robotic Network (AERONET) over seven megacities of Asia namely;Lahore, Karachi, Kanpur, Pune, Beijing, Osaka, and Bandung. We find that pollution aerosols dominate during the winter season in all the megacities. The concentrations, however, vary concerning the locations, i.e., 70–80% pollution aerosols are present over Lahore, 40–50% over Karachi, 90–95% over Kanpur and Pune, 60–70% and over Beijing and Osaka. Pure Dust (PD), pollution Dominated Mixture (PDM), and Dust Dominated Mixture (DDM) are found to be dominant during spring and summer *** proposes that dust over Asia normally exists as a mixture with pollution aerosols instead of pure form. We also find that black carbon (BC) dominated pollution aerosols. © 2024 Elsevier Ltd

关键词： Remote sensing

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Enhanced Hydrophobic Interaction between Fish Scale Gelatin And Curcumin: A Mechanism Study

SSRN

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SSRN 2023年

作者： Li, Haoxin Wan, Aida Wan Mustapha Tian, Guilin Dong, Nan Zhao, Feng Zhang, Xiaoping Long, Daoqi Liu, Jia The Key Laboratory of Environmental Pollution Monitoring and Disease Control Ministry of Education Guizhou Provincial Engineering Research Center of Ecological Food Innovation School of Public Health Guizhou Medical University Guiyang550025 China Bangi43600 Malaysia School of Liquor & Food Engineering Guizhou University Guiyang550025 China Institute of Food Processing Technology Guizhou Academy of Agricultural Sciences Guiyang550006 China Guizhou Fishery Research Institute Guizhou Academy of Agricultural Science Guiyang550025 China Chongqing Vocational Institute of Safety & Technology Chongqing404121 China

To enhance the delivery of nutrients by nanoparticles, the hydrophobicity of fish scale gelatin (FSG) was increased by degradation with acid or alkali hydrolysis. Amino acid and secondary structure analysis showed that the proportion of hydrophobic amino acids in FSG hydrolysate was significantly increased (from 41.1% to 46.4%) by acid hydrolysis, as was the transformation of the α-helix (from 12.8% to 4.9 ~ 3.2%) to the β-sheet (from 29% to 42.8 ~ 43.6%). Moreover, acid and alkali hydrolysis of FSG produce linear and granular hydrolyzates with a different molecular weight distribution. Acid hydrolyzed FSG showed superior curcumin loading efficiency (18.30 ± 0.38 μg/mL), presumably the result of increased hydrophobic interaction with the flexible structure of the linear hydrolyzates. The above results call for an investigation of the role of FSG hydrolysate in the synthesis of nanoparticles loaded with lipophilic compounds that are bioactive. © 2023, The Authors. All rights reserved.

关键词： Hydrolysis

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燃烧源氨排放对灰霾期间北京大气铵的重要贡献

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Science Bulletin 2024年第7期69卷 978-987页

作者：吴礼彬王芃张强任红 Zongbo Shi 胡伟陈静谢巧蓉李林杰越思瑶韦莲芳宋琳琳张永根王子涵陈爽韦琬王小曼章炎麟孔少飞葛宝珠杨婷方运霆任露洁邓君俊孙业乐王自发张宏亮胡建林刘丛强 Roy M.Harrison Qi Ying 傅平青 Institute of Surface-Earth System Science School of Earth System ScienceTianjin UniversityTianjin 300072China Department of Atmospheric and Oceanic Sciences Fudan UniversityShanghai 200438China IRDR ICoE on Risk Interconnectivity and Governance on Weather/Climate Extremes Impact and Public Health Fudan UniversityShanghai 200438China Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System ScienceTsinghua UniversityBeijing 100084China Air Environmental Modeling and Pollution Controlling Key Laboratory of Sichuan Higher Education Institute Chengdu University of Information TechnologyChengdu 610225China Division of Environmental Health&Risk Management School of GeographyEarth&Environmental SciencesUniversity of BirminghamBirmingham B152TTUK School of Environmental Science and Engineering Tianjin UniversityTianjin 300072China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110164China Yale-NUIST Center on Atmospheric Environment International Joint Laboratory on Climate and Environment ChangeNanjing University of Information Science and TechnologyNanjing 210044China Department of Atmospheric Sciences School of Environmental Studies and Department of Environmental Science and TechnologySchool of Environmental StudiesChina University of GeosciencesWuhan 430074China Department of Environmental Science and Engineering Fudan UniversityShanghai 200438China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlNanjing University of Information Science and TechnologyNanjing 210044China Department of Environmental Sciences/Center of Excellence in Environmental Studies King Abdulaziz UniversityJeddah 21589Saudi Arabia Zachr

Aerosol ammonium(NH_(4)^(+)),mainly produced from the reactions of ammonia(NH_(3))with acids in the atmosphere,has significant impacts on air pollution,radiative forcing,and human *** the source and formation mechanism of NH_(4)^(+)can provide scientific insights into air quality ***,the sources of NH_(3)in urban areas are not well understood,and few studies focus on NH_(3)/NH_(4)^(+)at different heights within the atmospheric boundary layer,which hinders a comprehensive understanding of aerosol NH_(4)^(+).In this study,we perform both field observation and modeling studies(the Community Multiscale Air Quality,CMAQ)to investigate regional NH_(3)emission sources and vertically resolved NH_(4)^(+)formation mechanisms during the winter in *** stable nitrogen isotope analyses and CMAQ model suggest that combustion-related NH_(3)emissions,including fossil fuel sources,NH_(3)slip,and biomass burning,are important sources of aerosol NH_(4)^(+)with more than 60%contribution occurring on heavily polluted *** contrast,volatilization-related NH_(3)sources(livestock breeding,N-fertilizer application,and human waste)are dominant on clean ***-related NH_(3)is mostly local from Beijing,and biomass burning is likely an important NH_(3)source(~15%–20%)that was previously *** effective control strategies such as the two-product(e.g.,reducing both SO_(2)and NH_(3))control policy should be considered to improve air quality.

关键词： Particulate ammonium Nitrogen isotope PM2.5 The Community Multiscale Air Quality(CMAQ) control policy

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Changes of Nitrogen and Phosphorus Removal Pattern Causing by Alternating Aerobic/Anoxia from the Perspective of Microbial Characteristics

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SSRN 2022年

作者： Yao, Kai Huang, Xiao Dong, Wenyi Wang, Fupeng Liu, Xueyong Yan, Yu Qu, Yanhui Fu, Yicheng 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 Shenzhen518055 China Northeast China Municipal Engineering Design and Research Institute Co Ltd Jilin130021 China Urban and Rural Water Environment Technology R&D Center China Communications Construction Co Ltd Jilin130021 China China Urban and Rural Holdings Group Co Ltd Beijing100029 China State Key Laboratory of Simulation and Regulation of River Basin Water Cycle China Institute of Water Resources and Hydropower Research Beijing100038 China

To investigate the effect of alternating aerobic/anoxic (A/O) on pollutant removal performance and microbial community structure, three sequencing batch reactors (SBR) processes with different alternating A/O times were set up. The results showed that alternating A/O was beneficial for organic matter degradation and promote nitrogen (N) and phosphorus (P) removal performance, and the removal efficiencies of chemical oxygen demand (COD), ammonia nitrogen (NH4+-N), total nitrogen (TN), and total phosphorus (TP) increased 3.41%, 4.76%, 3.51%, and 6.27%, respectively. Besides, alternating A/O affected the dominant microbial community relative abundance (Proteobacteria and Bacteroidetes) and increased microbial richness and diversity. It also increased the relative abundance of aerobic denitrifying, heterotrophic nitrifying, and denitrifying phosphorus removal bacteria to change N and P removal patterns. Furthermore, the abundance of carbohydrate metabolism and amino acid metabolism were improved by alternating A/O to improve organic matter and TN removal. © 2022, The Authors. All rights reserved.

关键词： Chemical oxygen demand

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Online Analysis of Volatile and Semivolatile Organic Compounds in Water Matrices Using a Dual-Channel Comprehensive Two-Dimensional Gas Chromatography Coupled with Time-of-Flight Mass Spectrometry System

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SSRN 2024年

作者： Chen, Guangxu Wu, Manman Ma, Qin Li, Mei Zhou, Zhen Xu, Jingwei Waterhouse, Geoffrey I.N. Song, Ninghui Zhao, Wei-Wei School of Environment and Energy State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control South China University of Technology Guangzhou510006 China Hangzhou Lin'an Ecological Environment Monitoring Station Hangzhou311300 China Institute of Mass Spectrometry and Atmospheric Environment Guangdong Provincial Engineering Research Center for Online Source Apportionment System of Air Pollution Jinan University Guangzhou510632 China Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality Guangzhou510632 China Guangdong MS Institute of Scientific Instrument Innovation Guangzhou510530 China School of Chemical Sciences The University of Auckland Auckland1142 New Zealand Nanjing Institute of Environmental Sciences Ministry of Ecology and Environment Nanjing210042 China State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical Engineering Nanjing University Nanjing210023 China

monitoring organic compounds in aquatic matrices can be a complex and time-consuming process. To address this issue, we present a novel approach that uses a dual-channel comprehensive two-dimensional gas chromatography–time-of-flight mass spectrometry (GC × GC–TOFMS) system equipped with an automatic pretreatment platform for online monitoring of volatile organic compounds (VOCs) and semivolatile organic compounds (SVOCs) in water matrices. Our automatic pretreatment platform incorporates headspace sampling (HS) and liquid–liquid extraction (LLE) to extract VOCs and SVOCs from water matrices. The GC × GC–TOFMS system features a dual-channel analytical structure column configuration, allowing for the sequential analysis of VOCs in the GC–TOFMS mode and SVOCs in the GC × GC–TOFMS mode. We quantitatively detected 55 and 104 target VOCs and SVOCs, respectively, in a water sample using the instrument system. Our method demonstrated excellent correlation coefficients ranging from 0.990 to 1.000, method detection limit ranging from 0.08 to 4.78 μg·L−1, relative standard deviation below 19.3%, and recovery rates ranging from 50.0% to 124.0%. To validate the online monitoring capabilities of our system, we tested the target SVOCs at three different concentration levels over a 3-day period. Most compounds exhibited recovery rates ranging from 70.0% to 130.0%. Furthermore, we applied our method to analyze a real water sample and successfully detected more than 100 target and nontarget VOCs/SVOCs, including alcohols, aldehydes, ketones, acids, esters, and phenols. Our results indicated the potential of our novel instrument system for effective screening and analysis of organic contaminants in aquatic matrices. This innovation provides a promising solution for improving the efficiency and accuracy of organic compound monitoring in water matrices. © 2024, The Authors. All rights reserved.

关键词： Volatile organic compounds

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中国碳收支:1980~2021年

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Science Bulletin 2024年第1期69卷 114-124页

作者：夏晓圣任培阳王旭辉刘丹陈修治丹利何斌何洪林居为民梁敏琪陆星劼彭静覃章才夏江周郑博魏静乐旭于贵瑞朴世龙袁文平 School of Atmospheric Sciences Guangdong Province Data Center of Terrestrial and Marine Ecosystems Carbon CycleSun Yat-sen UniversityZhuhai 510245China Sino-French Institute for Earth System Science College of Urban and Environmental SciencesPeking UniversityBeijing 100091China State Key Laboratory of Tibetan Plateau Earth System Resources and EnvironmentInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Earth Surface Processes and Resource Ecology College of Global Change and Earth System ScienceBeijing Normal UniversityBeijing 100875China Synthesis Research Center of China’s Ecosystem Research Network Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China International Institute for Earth System Science Nanjing UniversityNanjing 210023China Tianjin Key Laboratory of Water Resources and Environment Tianjin Normal UniversityTianjin 300387China Institute of Environment and Ecology Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing 210044China

As one of the world's largest emitters of greenhouse gases,China has set itself the ambitious goal of achieving carbon peaking and carbon ***,it is crucial to quantify the magnitude and trend of sources and sinks of atmospheric carbon dioxide(CO_(2)),and to monitor China's progress toward these *** state-of-the-art datasets and models,this study comprehensively estimated the anthropogenic CO_(2)emissions from energy,industrial processes and product use,and waste along with natural sources and sinks of CO_(2)for all of China during *** recognize the differences among various methods of estimating greenhouse emissions,the estimates are compared with China's National Greenhouse Gas Inventories(NGHGIs)for 1994,2005,2010,2012,and *** CO_(2)emissions in China have increased by 7.39 times from 1980 to 12.77 Gt CO_(2)a^(-1)in *** benefiting from ecological projects(e.g.,Three Norths Shelter Forest System Project),the land carbon sink in China has reached 1.65 Gt CO_(2)a^(-1)averaged through 2010-2021,which is almost 15.81 times that of the carbon sink in the *** average,China's terrestrial ecosystems offset 14.69%±2.49%of anthropogenic CO_(2)emissions through *** provincial-level administrative regions of China,Xizang and Qinghai,have achieved carbon neutrality according to our estimates,but nearly half of the administrative regions of China have terrestrial carbon sink offsets of less than 10%of anthropogenic CO_(2)*** study indicated a high level of consistency between NGHGIs and various datasets used for estimating fossil CO_(2)emissions,but found notable differences for land carbon *** estimates of the terrestrial carbon sinks of NGHGIs urgently need to be verified with process-based models which integrate the comprehensive carbon cycle processes.

关键词： CO_(2)emission Land carbon sink China Carbon neutrality Carbon budget

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