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Spatiotemporal characteristics of atmospheric CO2 under the influence of different industrial emission sources using lidar remote sensing in Nanping,China 认领 引用 被引量：1
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作者 Saifen Yu DaiHao Yu +3 位作者 Qiuwei xia Yixiang Chen Zhen Zhang Haiyun Xia 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第1期490-501,共12页
Atmospheric CO2 concentrations are predominantly regulated by multiple emission sources,with industrial emis-sions representing a critical anthropogenic driver that significantly influences temporal and spatial het... Atmospheric CO2 concentrations are predominantly regulated by multiple emission sources,with industrial emis-sions representing a critical anthropogenic driver that significantly influences temporal and spatial heterogeneity in regional CO2 patterns.This study investigated the spatiotemporal distribution of atmospheric CO2 in Pucheng and Nanping industrial parks,Nanping City,by conducting field experiments using two coherent differential absorption lidars from 1 August to 31 October 2024.Results showed that the spatial distributions of CO2 emis-sions within a 3 km radius were mapped,and the local diffusion processes were clarified.CO2 patterns varied differently in two industrial parks over the three-month period:Average CO2 concentrations in non-emission areas were 422.4 ppm in Pucheng and 408.7 ppm in Nanping,with the former experiencing higher and more variable carbon emissions;Correlation analysis indicated that synthetic leather factories in Pucheng contributed more to SO2 and NOx levels compared to the chemical plant in Nanping;In Pucheng,CO2 concentrations were transported from the north at ground-level wind speeds exceeding 4 m/s,while in Nanping,the concentrations dispersed gradually with increasing wind speeds;Forward trajectory simulations revealed that the peak-emission from Pucheng primarily affected southern Fujian,northeastern Jiangxi,and southern Anhui,while the peak-emission from Nanping influenced central and western Fujian and northeastern Jiangxi.Besides,emissions in both industrial parks were higher on weekdays and lower on weekends,reflecting changes in industrial activi-ties.The study underscores the potential of lidar technology for providing detailed insights into CO2 distribution and the interactions between emissions,wind patterns,and carbon transport. 展开更多
关键词 Lidar CO2 Wind field Spatiotemporal variations Carbon emission
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Process analysis of the impacts of ship emissions on PM2.5and O3in the Yangtze River Delta,China 认领 引用 被引量：1
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作者 Xinyi Fu Xiaotong Wang +3 位作者 Dongsheng Chen Jianlei Lang Ying Zhou Xiurui Guo 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第3期372-383,共12页
Ship emissions significantly impact coastal air quality,with the Yangtze River Delta(YRD)region accounting for approximately 50%of China's total shipping emissions.Using the Community Multiscale Air Quality(CMAQ)m... Ship emissions significantly impact coastal air quality,with the Yangtze River Delta(YRD)region accounting for approximately 50%of China's total shipping emissions.Using the Community Multiscale Air Quality(CMAQ)model and process analysis(PA)tool,we quantitatively assessed how atmospheric processes(emissions,chemical reactions,transport,and deposition)contribute to PM2.5and O3,and the chemical pathways of O3formation due to ship emissions.Ship emissions significantly enhanced PM2.5concentrations(>5μg/m3)in the coastal areas of Jiangsu province and offshore regions,with diminishing inland effects.Ship-induced NO3-showed greater inland penetration compared to SO42-,which remained near the coast.In coastal cities,aerosol processes,rather than primary emissions,dominated PM2.5formation,highlighting the importance of secondary formation.O3responses varied spatially,showing coastal titration zones but inland enhancements.Process analysis revealed that vertical transport dominated O3distribution in coastal regions(5-10 ppb),whereas chemical processes showed strong negative contributions(below-10 ppb)along shipping routes.The impact exhibited pronounced diurnal variations,peaking during afternoon hours(14:00-17:00 local standard time(LST),up to 10 ppb/h)with morning titration effects(up to-7.5 ppb/h at 08:00 LST).The vertical profile analysis of shipping-related O3showed surface-level O3titration from ship NOxemissions,with impacts extending to higher layers through vertical mixing.Integrated reaction rate analysis revealed that effective O3control in shipping-influenced regions requires coordinated reduction of both NOxand VOCs.These findings provide insights for developing targeted control strategies,particularly for addressing the complex NOx-O3chemistry and secondary PM2.5formation. 展开更多
关键词 Ship emissions Process analysis PM(2.5) O3 Yangtze River Delta
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Trends,drivers,and reduction pathways for food-related greenhouse gas emissions in China:1961-2050 认领 引用
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作者 Jinyu Han Jiansheng Qu +5 位作者 Tek Narayan Maraseni Dai Wang Jianpeng Zhang Li Xu Yujie Ge Dingye Wu 《Chinese Journal of Population,Resources and Environment》 CSCD 2026年第1期14-26,共13页
Greenhouse gas(GHG)emissions from China’s food system are a major environmental concern;however,studies quantifying their drivers and future projections remain limited.This study uses structural decomposition analysi... Greenhouse gas(GHG)emissions from China’s food system are a major environmental concern;however,studies quantifying their drivers and future projections remain limited.This study uses structural decomposition analysis and growth curve models to assess food-related GHG trends from 1961 to 2020,identify key drivers and their contributions,and project emissions for 2050 under six economic and population scenarios.It also proposes reduction pathways to help China achieve its 2060 carbon neutrality goal.Animal and plant foods are categorized into 14 groups based on the similarity of their emission coefficients.China’s total food related GHG emissions rose tenfold,from 351.7 to 3719.8 million tons CO2-equivalent(CO2e)/year,between 1961 and 2020.Per-capita emissions increased from 532.1 to 2584.4 kg CO2e/year.Emissions from plant based foods grew from 435.0 to 824.6 kg CO2e/year,while animal-based emissions surged from 97.1 to 1759.8 kg CO2e/year,with animal products contributing more owing to their higher emission coefficients.Key drivers include rising food intake,increasing demand for animal-based foods(especially red meat),and population growth.Scenario analyses predict that emissions will peak at 3826.2 million tons CO2e/year in 2031(low economy-low population)and 3971.0 million tons CO2e/year in 2039(high economy-medium population).Compared with Australian,Indian,and Japanese diets,Chinese diets exhibit lower per-capita emissions than Australia and India but have higher emissions than in Japan.Adhering to China’s national dietary guidelines could reduce Chinese per-capita food-related GHGs by 31.5%,and optimized diets could lower them by 45.3%.This study provides valuable insights for Chinese policymakers to reduce food-related GHG emissions,refine national dietary guidelines,and raise public awareness regarding the food system’s environmental impact,thus encouraging people to follow sustainable diets. 展开更多
关键词 Food emissions Drivers of food emissions Forecasting future emissions China
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Long-term manure amendment enhances N2O emissions from acidic soil by alleviating acidification and increasing nitrogen mineralization 认领 引用
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作者 Lei Wu Jing Hu +4 位作者 Muhammad Shaaban Jun Wang Kailou Liu Minggang Xu Wenju Zhang 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2026年第1期262-272,共11页
Long-term manure application has the potential to alleviate soil acidification, and increase carbon sequestration and nutrient availability, thus improving cropland fertility. However, the mechanisms behind greenhouse... Long-term manure application has the potential to alleviate soil acidification, and increase carbon sequestration and nutrient availability, thus improving cropland fertility. However, the mechanisms behind greenhouse gas N2O emissions from acidic soil mediated by long-term manure application remain poorly understood. Herein, we investigated N2O emission and its linkage with gross N mineralization and nitrification rates, as well as nitrifying and denitrifying microbes in an acidic upland soil subjected to 36-year fertilization treatments, including an unfertilized control(CK), inorganic fertilizer(F), 2× rate of inorganic fertilizer(2F), manure(M), and the combination of inorganic fertilizer and manure(FM) treatments. Compared to the CK treatment(1.34 μg N kg-1 d-1), fertilization strongly increased N2O emissions by 34-fold on average, with more pronounced increases in the manure-amendment(10.6-169 μg N kg-1 d-1) than those in the inorganic fertilizer treatments(3.26-5.51 μg N kg-1 d-1). The manure amendment-stimulated N2O emissions were highly associated with increased soil pH, mean weight diameter of soil aggregates, substrate availability(e.g., particulate organic carbon, NO3-and available phosphorus), gross N mineralization rates, denitrifier abundances and the(nirK+nirS)osZ ratio. These findings suggest that the increased N2O emissions primarily resulted from alleviated acidification, increased substrate availability and improved soil structure, thus enhancing microbial N mineralization and favoring N2O-producing denitrifiers over N2O consumers. Moreover, ammonia-oxidizing bacteria(AOB) rather than ammonia-oxidizing archaea(AOA) positively correlated with soil NO3-concentration and N2O emissions, indicating that nitrification indirectly contributed to N2O production by supplying NO3-for denitrification. Collectively, manure amendment potentially stimulates N2O emissions, primarily resulting from alleviated soil acidification and increased substrate availability, thus enhancing N mineralization and denitrifier-mediated N2O production. Our findings suggest that consideration should be given to the greenhouse gas budgets of agricultural ecosystems when applying manure for managing the pH and fertility of acidic soils. 展开更多
关键词 long-term manure amendment N2O emission nitrogen mineralization denitrification (nirK+nirS)osZ
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Increasing soil organic matter and nitrogen use by optimizing summer maize straw return and nitrogen fertilizer rates minimize N2O emissions in a wheat–maize system 认领 引用
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作者 Hongxing Li Fei Gao +5 位作者 Lei Wang Alam Sher Baizhao Ren Bin Zhao Peng Liu Jiwang Zhang 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2026年第7期2796-2811,共16页
The effects of maize straw return and N fertilizer application on soil quality and crop yield have been extensively investigated.However,the effects of different amounts of maize straw returned to the field with diffe... The effects of maize straw return and N fertilizer application on soil quality and crop yield have been extensively investigated.However,the effects of different amounts of maize straw returned to the field with different nitrogen application rates on the soil-crop system quality,abundance of functional N cycle microorganisms,N2O emissions,and crop N nutrition status of crops have not been thoroughly explored.The objective of this study was to assess the effects of different summer maize straw return rates and N application rates on i)soil quality and crop productivity;ⅱ)the community of N cycle functional microorganisms and N2O emission;and ⅲ)crop N status.The results indicated that crop yields increased by7.62 to 12.69%at 210 kg ha-1 of N application for full straw return(SN)and half return(1/2SN)compared to the no-return treatment(CK).No significant difference was noted in the yields between the full straw return reduced by 15%(178.5 kg N ha-1)of N fertilizer(S-15%N)and SN.The surface soil layer(0-20 cm)showed significantly higher levels of soil organic matter(SOM),the community of N-cycling functional microorganisms,crop N nutrition status and N uptake efficiency in SN,1/2SN,and S-15%N as compared to other treatments.Compared to SN,S-15%N and 1/2SN reduced cumulative N2O emission fluxes by 19.11 and 5.51%,respectively.Furthermore,the nitrogen nutrient index(NNI)values of 1/2SN and S-15%N were closer to the critical N requirement than SN.In summary,schemes for determining the optimal rates of straw return and N application(1/2SN and S-15%N)based on SOM,NNI,cumulative N2O emission fluxes,and yield can be applied to the annual production of winter wheat and summer maize in China. 展开更多
关键词 maize straw return nitrogen application soil physicochemical properties nitrogen use efficiency N2O emission nitrogen cycle functional microorganisms
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Near-infrared emission of Eu2+in M4Li(BN2)3(M=Ca,Sr,Ba) 认领 引用
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作者 Dilare Halmurat Xinyu Zhang +1 位作者 Litipu Aihaiti Rong-Jun Xie 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第3期733-741,I0001,共9页
Eu2+-doped phosphors show broadband absorption,tunable emission and high quantum efficiency due to the parity-allowed 5d→4f transitions,allowing them to be used in solid-state lighting.To expand their applications... Eu2+-doped phosphors show broadband absorption,tunable emission and high quantum efficiency due to the parity-allowed 5d→4f transitions,allowing them to be used in solid-state lighting.To expand their applications in other fields such as detection and sensing technologies,the Eu2+emission needs to be tuned into the near-infrared region,but it is a big challenge to obtain Eu2+near-infrared region emitters due to the absence of host compounds with extremely large crystal-field splitting.In this work,we chose M4Li(BN2)3(M=Ca,Sr,Ba)as a host and realize the near-infrared region emission of Eu2+in it.Among these phosphors,Ba4Li(BN2)3:Eu2+exhibits the longest emission of 880 nm and the largest full-width at half maximum of 276 nm under 450 nm excitation,while Ca4Li(BN2)3:Eu2+and Sr4Li(BN2)3:Eu2+emit at740 and 680 nm,respectively.We observe an interesting phenomenon that the energy shift of emission is linearly related to the radius difference between the alkaline earth cation and the activator Eu2+in this system. 展开更多
关键词 Phosphors Nitridoborates Near-infrared emission Photoluminescence Rare earths
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Effects of functional microorganisms and environmental factors on CO2 and CH4 emissions in a typical floodplain lake system 认领 引用
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作者 Jiajia Li Fan Wu +1 位作者 Xianrui Ha Yang Gao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第1期312-321,共10页
Lakes are carbon dioxide(CO2)and methane(CH4)emission hotspots,whose associated flux is spatially vari-able.Many studies have investigated the impact of microorganisms and environmental factors on CO2 and CH_... Lakes are carbon dioxide(CO2)and methane(CH4)emission hotspots,whose associated flux is spatially vari-able.Many studies have investigated the impact of microorganisms and environmental factors on CO2 and CH4 emissions between different lakes.However,the carbon emissions and their influencing factors of different areas within a single lake remain poorly understood.Accordingly,this study investigates CO2 and CH4 emission hetero-geneity in a large floodplain lake system and distribution characteristics of associated functional microorganisms.Findings show that mean CO2 and CH4 flux values in the sub lake area were 62.03±24.21 mg/(m2·day)and 5.97±3.2μg/(m2·day),which were greater by factors of 1.78 and 2.96 compared to the water channel and the main lake area,respectively.The alpha diversity of methanogens in the sub lake area was lower than that in the main lake and water channel areas.The abundance of methanogens in bottom water layer was higher compared with the middle and surface layers.Conversely,the abundance of methane(CH4)-oxidizing bacteria in the surface layer was higher than that in the bottom layer.Additionally,the composition of methanogen and CH4-oxidizing bacterial community,chlorophyll a(Chl-a),pH,total phosphorus(TP)and dissolved organic carbon(DOC)con-tent constituted the dominate driving factors affecting lake C emissions.Results from this study can be used to improve our understanding of lake spatial heterogeneous of CO2 and CH4 emission and the driving mechanisms within floodplain lakes under the coupling effects of functional C microorganisms and environmental factors. 展开更多
关键词 Carbon emission Flux Methanogens Methane oxidizers Carbon cycle Poyang Lake
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N2O emissions fueled by eutrophication in a shallow lake 认领 引用
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作者 Heyang Sun Ruihong Yu +6 位作者 Xixi Lu Andreas Lorke Zhengxu Cao Xinyu Liu Xiangwei Li Zhuangzhuang Zhang Baoshan Cui 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第2期166-173,共8页
Lakes are emission hotpots of nitrous oxide(N2O),however,this phenomenon remains poorly constrained.Eutrophication is widespread in lakes,yet its contribution to N2O emissions is still not well understood.Here,w... Lakes are emission hotpots of nitrous oxide(N2O),however,this phenomenon remains poorly constrained.Eutrophication is widespread in lakes,yet its contribution to N2O emissions is still not well understood.Here,we investigate the spatiotemporal variations of N2O concentrations,fluxes and indirect emission factors(EF5r)and their drivers in Ulansuhai lake,a shallow eutrophic lake located in a semi-arid region in northern China,during 2019–2020.The mean concentration of N2O in water was 20.0±6.7 nmol/L,with a mean diffusive N2O flux of 16.50±21.52μmol/(m2·day),indicating that this lake acted as a persistent source of atmospheric N2O.Estimated indirect emission factors(EF5r)(mean value 0.0037±0.0060)were significantly higher than the default values(0.0026)used in Intergovernmental Panel on Climate Change(IPCC)emission inventories.The N2O concentrations,fluxes and EF5r exhibited substantial seasonal variations and small spatial variations.N2O concentrations and fluxes were positively correlated with the trophic status and EF5r increased with increasing nutrient concentrations in the water.These findings demonstrate the role of eutrophication in influencing the N2O dynamics and confirm that eutrophication can exacerbate N2O emissions. 展开更多
关键词 Nitrous oxide Greenhouse gas Eutrophication Nitrous oxide emission factor
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Agricultural carbon emission intensity(ACEI)in China from 1997 to 2022:Spatiotemporal differences,convergence,and its influence factors 认领 引用
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作者 ZOU Lilin LI Shulin WANG Yongsheng 《Regional Sustainability》 CAS CSCD 2026年第4期1-19,共19页
Exploring the spatiotemporal differences and convergence mechanisms of agricultural carbon emissions in China can contribute to global agricultural carbon emission reduction.Taking 31 provinces, municipalities, and au... Exploring the spatiotemporal differences and convergence mechanisms of agricultural carbon emissions in China can contribute to global agricultural carbon emission reduction.Taking 31 provinces, municipalities, and autonomous regions of China (excluding Hong Kong, Macao, and Taiwan due to data unavailability) as the study area, this paper estimated the agricultural carbon emission intensity (ACEI) during 1997-2022 and analyzed its spatiotemporal characteristics, decomposed its regional differences by using the Dagum Gini coefficient, and explored its convergence mechanism by adopting the spatial β-convergence and the Spatial Durbin Model (SDM). The result showed that China's ACEI has shown a downward trend during 1997-2022,with an average annual reduction rate of 4.71%, and the inter-regional difference continued to widen, with the inter-regional difference of 66.17%. The absolute β-convergence speed was lower than the conditional β-convergence speed, indicating that regional heterogeneity in agricultural production significantly accelerates spatial convergence. This effect was particularly pronounced in the central region, where favorable agricultural conditions contribute to the fastest convergence rate. In this process, social support and environmental regulation,application and innovation of agricultural technologies, as well as agricultural structure and development potential in different regions (eastern, central, and western regions)exhibited distinct spatiotemporal effects. These findings suggest that the hierarchical spatial pattern of ACEI in China results from the interaction of multiple systems,including the environmental, social, economic, and governmental dimensions. 展开更多
关键词 Agricultural carbon emission intensity(ACEI) Dagum Gini coefficient Absolute and conditionalβ-convergence Spatial Durbin Model(SDM) Spatial convergence
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Nutrient accumulation and eutrophication restricted CO2 emissions in the two backwater bays in the Three Gorges Reservoir(TGR),China 认领 引用
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作者 Chen Jian Xiaofeng Wang +5 位作者 Tingting Liu Yuewei Zhang Lijun Wang Honglin Chen Dongfeng Li Yixin He 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第2期656-669,共14页
Reservoir is an important source of CO2 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 CO2 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 CO2 emissions in these backwater bays remain unclear.This study investigated CO2 fluxes(fCO2)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 CO2 emissions.The two backwater bays serve as minor sources of CO2 emissions,exhibiting lower fCO2 compared to other water areas within the TGR.In the subsiding and low water level periods of the TGR,the fCO2 in the two backwater bays were significantly lower,with some areas even converting into CO2 sinks due to extensive eutrophication.However,the water flow backward caused by the TGR water level elevation simultaneously enhances CO2 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 CO2 emissions from backwater bays in the TGR.The CO2 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 CO2 emissions in the backwater bays diversified with water level fluctuations.Our findings contribute to a better understanding of CO2 emissions in large reservoirs with varying hydrological habitats. 展开更多
关键词 CO2flux Backwater bays Nutrient accumulation Eutrophication Three Gorges Reservoir
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CO2 emission characteristics of hybrid electric vehicles in the tank-to-wheel(TTW)phase in plateau region 认领 引用
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作者 Decui Wan Jiguang Wang +5 位作者 Chao He Haisheng Yu Longqing Zhao Yanlin Chen Huawei Xu Jiaqiang Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第8期558-569,共12页
In order to investigate the CO2 emission characteristics of hybrid electric vehicles in the tank-to-wheel(TTW)Phase in plateau region,this study conducted real-driving emission tests in Kunming using a portable emi... In order to investigate the CO2 emission characteristics of hybrid electric vehicles in the tank-to-wheel(TTW)Phase in plateau region,this study conducted real-driving emission tests in Kunming using a portable emissions measurement system(PEMS).The test fleet included one internal combustion engine vehicle(ICEV)and three hybrid electric vehicles with different powertrain architectures:a plug-in hybrid electric vehicle(PHEV),a rangeextended electric vehicle(REEV),and a series/parallel hybrid electric vehicle(SPHEV).The results show that the CO2 emissions of hybrid electric vehicles is significantly lower than that of ICEV under various road conditions,especially under complex urban conditions,the CO2 emission factors of ICEV are 2.56-3.27 times higher than those of hybrid electric vehicles.Hybrid electric vehicles are influenced by engine and driving characteristics,with engine characteristics having a more significant impact.The CO2 emission rates exhibit a significant nonlinear relationship with engine speed and exhaust temperature,and its R2=0.86-0.94.Additionally,the CO2 emission rates show a significant polynomial function relationship with vehicle velocity and acceleration.It was also found that in the Bin33-Bin40 range,the CO2 emissions of ICEV,PHEV and REEV increased with the increase of vehicle specific power(VSP),while SPHEV showed a certain emissions suppression trend.Research indicates that hybrid electric vehicles possess stronger emission reductions capabilities under multiple operating conditions,providing technical support for achieving urban low-carbon transportation goals. 展开更多
关键词 Hybrid electric vehicles CO 2 emission Tank-to-wheel(TTW)phase Real driving emission Plateau region
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The functional analysis of NirBD in microorganisms and the efficacies of NirBD on the soil nitrogen storage and N2O emission 认领 引用
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作者 Yidan Peng Tengxia He +2 位作者 Qimin Zhou Mengyuan Yin Chengtao Jin 《Synthetic and Systems Biotechnology》 SCIE CSCD 2026年第2期364-373,共10页
The siroheme-containing nitrite reductase(NirBD),which is encoded by the nirBD gene,is a functional enzyme in the nitrogen cycle.The NirBD enzyme can regulate N2O release through the two distinct pathways of assimilat... The siroheme-containing nitrite reductase(NirBD),which is encoded by the nirBD gene,is a functional enzyme in the nitrogen cycle.The NirBD enzyme can regulate N2O release through the two distinct pathways of assimilatory nitrateitrite reduction to biomass and dissimilatory nitrateitrite reduction to ammonium.Therefore,a thorough comprehension of the function of NirBD in microorganisms can enable us to better understanding the contributions for nitrogen retention and N2O emission.However,the knowledge of the functions and expression mechanisms of nirBD gene across different microorganisms remains limited.This review synthesized the current research on the phylogenetic distribution and catalytic versatility of NirBD in fungi,bacteria,and actinomycetes.The contributions of NirBD for nitrogen retention and N2O emission were extensively discussed under anaerobic and aerobic conditions.The expression mechanism of NirBD was demonstrated.The factors that affect the expression amount of the NirBD enzyme in microorganisms were clarified systematically.This review not only elucidated the unique role of NirBD in the nitrogen metabolism but also provided a critical theoretical foundation for developing future strategies to enhance soil nitrogen fertility and mitigate N2O emissions. 展开更多
关键词 NirBD Soil nitrogen storage N2O emission Microorganisms DNRA and denitrification
Evaluating Scope-2 CO2 Emission Factor Calculation Methods Based on Historical Energy Consumption 认领 引用
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作者 Aditya Mairal Todd Rossi Michael Muller 《Energy Engineering》 EI 2026年第4期549-569,共21页
An integral part of the effort to reduce greenhouse gas emissions is carbon footprint accounting.EPA categorizes facility carbon footprints in three scopes.Scope-2 emissions include electricity,heat or steam purchased... An integral part of the effort to reduce greenhouse gas emissions is carbon footprint accounting.EPA categorizes facility carbon footprints in three scopes.Scope-2 emissions include electricity,heat or steam purchased from a utility provider.This paper evaluates the existing calculation methods for scope-2 CO2 emissions for purchased electricity.The electricity grid in US is complex and is divided spatially into states,eGRID regions,balancing authorities(BAs),and utilities.Up to hourly temporal granularity can be obtained from available datasets.A matrix is developed that categorizes different datasets based on the complexity to calculate the carbon emission factors.Spatial and temporal variations are evaluated.There are significant spatial overlap between regions in different categories and emission factors within a region show sub-regional variation.An area analysis is done using zip-code polygons to determine whether a state or balancing authority is smaller for all the overlapping cases.Temporal variations in emission factors are significant depending on the balancing authority considered.A single method to calculate scope-2 emission factors may not be accurate and efficient in every case and a nuanced assessment of emission factors is warranted.An implementation pathway for a“smart carbon calculator”—one that gives accurate carbon footprint that is the spatially and temporally most granular is suggested. 展开更多
关键词 Carbon footprint scope-2 emissions eGRID balancing authority emission factors
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Host-dependent Eu2+/Eu3+co-luminescence and excitation-tunable multicolor emission of Eu-doped Ae F2(Ae=Ca,Sr,Ba,Ca0.5Sr0.5,Ca0.33Sr0.33Ba0.33)single crystals 认领 引用
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作者 Xiaobo Huang Ying Quan +4 位作者 Wudi Wang Qingguo Wang Xiaodong Xu Huili Tang Jun Xu 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第4期614-622,共9页
This study successfully grew a series of mixed-valence Eu2+/Eu3+co-activated alkaline-earth fluoride single crystals(CaF2,SrF2,BaF2,Ca0.5Sr0.5F2,and the medium-entropy Ca0.33Sr0.33Ba_(0.3... This study successfully grew a series of mixed-valence Eu2+/Eu3+co-activated alkaline-earth fluoride single crystals(CaF2,SrF2,BaF2,Ca0.5Sr0.5F2,and the medium-entropy Ca0.33Sr0.33Ba0.33F2)using the vertical Bridgman method.During the high-temperature growth process,Eu3+undergoes spontaneous reduction to form Eu2+.X-ray photoelectron spectroscopy(XPS)confirmed the coexistence of both valence states,and their relative ratio exhibits a strong host-dependence;for instance,Eu2+is predominant in SrF2,while Eu3+is dominant in BaF2.Under ultraviolet excitation,all crystals simultaneously exhibit the broadband emission of Eu2+(400-550 nm)and the narrow-line emission of Eu3+(585-710 nm).The Eu2+emission peak systematically red-shifts from 440 nm in CaF2to 485 nm in BaF2as the host cation radius increases.Efficient resonant energy transfer from Eu2+to Eu3+is evidenced by spectral overlap and opposing fluorescence lifetime trends.By controlling the host's composition,the emission chromaticity of the crystals can be continuously tuned from the deep-blue of CaF2(0.1720,0.0382)to the warm-white of BaF2(0.4135,0.3516)under 299 nm excitation.Notably,the medium-entropy Eu:Ca0.33Sr0.33Ba0.33F2crystal can achieve a shift in emission tone from neutral white to warm white simply by changing the excitation wavelength.These findings provide a new design strategy for developing single-activator,wide-gamut,tunable luminescent materials for next-generation solid-state lighting and display technologies. 展开更多
关键词 matrix effect Eu2+/Eu3+ energy transfer multicolor emission Eu:Ae F2crystals
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Greening and recycling clothes: pathways to flatten the carbon emission in China’s textile industry by 2035 认领 引用
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作者 Li Sun Jiacong Cai +6 位作者 Linze Hou Encheng Zhang Jingqi Li Jianxun Yang Wen Fang Zongwei Ma Miaomiao Liu 《ENGINEERING Environment》 SCIE EI CAS CSCD 2026年第1期131-142,共12页
As economic growth drives lifestyle changes and increased fashion consumption, the environmental footprint of the textile and apparel industry has expanded significantly. A comprehensive understanding of carbon emissi... As economic growth drives lifestyle changes and increased fashion consumption, the environmental footprint of the textile and apparel industry has expanded significantly. A comprehensive understanding of carbon emissions from the textile and apparel industry and their underlying drivers is essential for designing effective mitigation strategies that align economic development with net-zero targets. Using household consumption data and supply chain data, we quantified total carbon emissions from China’s textile industry between 2000 and 2018, considering both production- and consumption- based perspectives. Results indicate that the growing demand contributes to 85% (79.5% to 92.7%) of total carbon emissions from China’s textile industry. The results of decomposition analysis further suggest that household consumption and exports together can lead to a total increase of 349.6 Mt CO2 in China’s textile industry from 2000 to 2018. To effectively curb the rapid increase in carbon emissions from the textile industry, we designed five scenarios to estimate the carbon reduction potential of measures such as the promotion of energy-saving technologies, adoption of renewable energy and enhanced clothing recycling. We found that a joint strategy combining renewable energy adoption and recycling can achieve significant reductions in total carbon emissions from China’s textile industry. These findings reveal the evolution process and drivers of carbon emissions in China’s textile industry, offering a scientific basis for achieving net-zero goals while sustaining the pursuit of high-quality development in the future. 展开更多
关键词 Carbon emission Textile and apparel industry Household consumption Exports Decomposition
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Using Carbon Dioxide Removal for a Habitable Post-2050 Net-Zero Emission World:Contributions and Limitations 认领 引用
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作者 CUI Xin LI Jianping FENG Ellias Yuming 《Journal of Ocean University of China》 SCIE CAS CSCD 2026年第1期207-216,共10页
United Nations(UN)encourages sovereign states to take prompt and concrete measures to accomplish net-zero emissions by year 2050,requesting carbon dioxide removal(CDR)technologies to be prepared and implemented in suc... United Nations(UN)encourages sovereign states to take prompt and concrete measures to accomplish net-zero emissions by year 2050,requesting carbon dioxide removal(CDR)technologies to be prepared and implemented in such ambitious climate action roadmap.However,whether CDR technologies should be further promoted or discontinued post net-zero emission year remains unclear.In this Earth-system modelling research,we compare UN-suggested 2050 net-zero emission scenario against other common climate mitigation scenarios outlined by shared social-economic pathways(SSPs).We also simulate continued CDR implementations after net-zero emissions,which is hypothetically achieved in year 2050 and 2070 respectively,to investigate how CDR can impact the global climate throughout the whole 21st and 22nd centuries.The modelling results find if the 2050 UN net-zero emission goal is accomplished,the global average surface air temperature(SAT)in the end of 21st century is around 1.5℃higher compared to the pre-industrial level,promising an Earth environment more habitable than other scenarios without CDR.When CDR is applied to remove equal amount of anthropogenic CO2emissions since industrial revolution,it restores the global average SAT close to pre-industrial level of 13.5℃.However,CDR-induced global carbon distribution within ocean,atmosphere,and land pools is different from the pre-industrial condition,causing reduced atmospheric CO2concentration by 9 to 38 ppm compared to the pre-industrial cases,and more alkalinized ocean surface with pH increase of 0.004 to 0.024.This study affirms CDR cannot be viewed as a reversed process to anthropogenic CO2emissions,accordingly climate policies to overcome the uncertainties after for late 21st century still require careful trade-offs for the decarbonation and the cost-benefits of CDR measures. 展开更多
关键词 net-zero emissions CDR Earth-system modelling global warming sea-level rise ocean acidification
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Design of dual-mode optical temperature sensing in single-component white light emission Bi3+/Sb3+/Ho3+ tri-doped Cs2Ag0.2Na0.8LuCl6 double perovskites 认领 引用
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作者 Zehua Zhang Lili Wang +2 位作者 Ruiliang Zuo Zhenzhen Jiang Guangyong Jin 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第1期25-35,共11页
The single-component white light emission microcrystals were synthesized in Bi3+/Sb3+/Ho3+ ions tridoped Cs2Ag0.2Na0.8LuCl6 double perovskites by a simple precipitation method.In Bi3+/Sb3+ i... The single-component white light emission microcrystals were synthesized in Bi3+/Sb3+/Ho3+ ions tridoped Cs2Ag0.2Na0.8LuCl6 double perovskites by a simple precipitation method.In Bi3+/Sb3+ ions double-d oped Cs2Ag0.2Na0.8LuCl6 microcrystals,the tunable emission from yellow(Bi3+) to blue(Sb3+)can be achieved under ultraviolet light excitation.Particularly,the white light emission is obtained after doping Ho3+ ion because of the energy transfer processes of Bi3+→Ho3+ and Sb3+→Ho3+.The chromaticity coordinates(CIE) of Cs2Ag0.2Na0.8LuCl6:5 mol% Bi3+,1 mol% Sb3+,15 mol% Ho3+microcrystal are(0.3354,0.3394) under 315 nm excitation.Meanwhile,the white light emissions with different color temperatures are obtained through varying the exc itation wavelength(255-365 nm).Additionally,temperature-dependent fluorescence spectra show that the emission intensity of Bi3+/Sb3+/Ho3+ tridoped Cs2Ag0.2Na0.8LuCl6 microcrystal at 423 K remains 54% of that at 303 K.Moreover,the fluorescence intensity ratio(FIR) of 641 and 665 nm is highly temperature-dependent,the relative sensitivity(Sr) reaches 1.06%/K at 303 K under 315 nm excitation.Simultaneously,the microcrystal shows thermochromism phenomenon,and the emission changes from white to blue-purple with the increase of temperature from 303 to 513 K.The novel temperature sensing is achieved based on CIE coordinates and temperature technology in Cs2Ag0.2Na0.8LuCl6:5 mol% Bi3+,1 mol% Sb3+,15 mol% Ho3+ microcrystal by exciting at 315 nm.The corresponding maximum Sr is 0.34%/K.Accordingly,Bi3+/Sb3+/Ho3+ ions tridoped Cs2Ag0.2Na0.8LuCl6 double perovskite has potential applications in the fields of white light emitting diode and optical temperature sensing. 展开更多
关键词 Lead-free double perovskite Bi3+/Sb3+/Ho3+ions tri-doped 0ptical temperature sensing White light emission Rare earths
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Examining the Nonlinear Effects of Urban Population Polycentricity on Carbon Emissions Efficiency Using a Gradient Boosting Decision Tree Model:Evidence from 295 Chinese Cities 认领 引用
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作者 WANG Cheng YANG Xingzhu 《Chinese Geographical Science》 SCIE CAS CSCD 2026年第2期222-238,共17页
Transforming urban spatial structures to promote green and low-carbon development is an effective strategy.Although prior studies have examined the impact of urban polycentricity on carbon emissions and economic devel... Transforming urban spatial structures to promote green and low-carbon development is an effective strategy.Although prior studies have examined the impact of urban polycentricity on carbon emissions and economic development,research on its role in the synergistic relationship between these factors regarding carbon emission efficiency is limited.Furthermore,existing literature often overlooks nonlinear effects and interactions with other urban variables.This paper analyzed data from 295 Chinese cities in 2020,calculating urban population polycentricity,population dispersion indices,and carbon emission efficiency.Utilizing local spatial autocorrelation tools,we reveal interactions among urban population polycentricity,dispersion,carbon emissions,and carbon emission efficiency.We then employ a gradient boosting decision tree model(GBDT)to explore nonlinear and synergistic effects of polycentric urbanization.Key findings include:1)polycentric urbanization in Chinese cities exhibits significant spatial differentiation characteristics.The Polycentricity index is relatively high in economically developed eastern coastal regions with an overall low level,carbon emissions are concentrated in industrialized north-central cities and some Yangtze River Delta hubs,and carbon emission efficiency is the highest in the Yangtze River Delta while relatively low in Northeast China;there are significant spatially heterogeneous interaction characteristics among population polycentricity,population dispersion,carbon emissions,and carbon emission efficiency.2)Urban population polycentricity contributes 9.42%to total carbon emissions and 6.24%to carbon emission efficiency.3)The polycentricity index has a nonlinear impact on carbon emissions and carbon emission efficiency:no significant effect when below 0.50 or above 0.55,increased carbon emissions in 0.50-0.53,and reduced carbon emissions with improved efficiency in 0.53-0.55.4)The polycentricity index has an interaction effect with other variables;specifically,when the polycentricity index is between 0.53 and 0.55,its interaction with urban gross domestic product(GDP),urban population,urban built-up area,green coverage rate in built-up areas,urban technological expenditure,and the proportion of the output value of the secondary industry will reduce carbon emissions and improve carbon emission efficiency.These findings enhance the understanding of urban spatial structures and carbon emissions,providing valuable insights for policymakers in developing green and low-carbon strategies. 展开更多
关键词 urban polycentricity carbon emission efficiency gradient boosting decision tree(GBDT) nonlinear threshold effects Chinese cities
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Chemical stoichiometry and gradient shell engineering for highly-efficient narrow near-band-edge emission in CuInS2 quantum dots 认领 引用
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作者 Kai Wang Keyang Zhao +4 位作者 Sheng Cao Zilong Li Weiyou Yang Jinju Zheng Hui Fu 《Nano Materials Science》 EI CAS CSCD 2026年第1期59-68,共10页
Copper indium sulfur-based quantum dots(CIS QDs)are classified as one of well-known ternaryⅠ-Ⅲ-Ⅵsemiconductors,which have exciting promising applications in display and lighting devices,due to their unique merits s... Copper indium sulfur-based quantum dots(CIS QDs)are classified as one of well-known ternaryⅠ-Ⅲ-Ⅵsemiconductors,which have exciting promising applications in display and lighting devices,due to their unique merits such as non-toxicity,stability,and high photoluminescence quantum yield(PL QY).However,the emission full width at half maximum(FWHM)of CIS-based QDs typically extends to~140 nm,fundamentally limiting their use in high-color-purity light emitting.Herein,we report the rationally-designed CIS QDs with high efficiency and narrowband emission by chemical stoichiometry and gradient shell engineering,based on precisely controlling the dynamic growth and stoichiometric ratio.It is found that the accurate control on the growth kinetics and stoichiometry during the nucleation process of CIS QDs could enhance the crystallinity through gradual and organized crystalline growth,which effectively mitigates the formation of InCusubstitutional and Cu vacancies,thus suppressing the defect emission.Furthermore,the introduced InSx/ZnxGa1-xS gradient shell on the surface of QDs cores could reduce the strain within interface,thereby eliminating the non-radiative recombination caused by the surface defects resulted from interface strain.As a result,a remarkable PLQY of 89%is achieved for the QDs.More importantly,their FWHM decreases to 70 nm,which is the narrowest one for CIS-based QDs ever reported,representing their bright future to be applied in high-definition display devices. 展开更多
关键词 CuInS2 Quantum dots Crystal growth Optical performance Defect passivation
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From Emission to Absorption:The FAST Observation of the OH 18 cm Lines from Comet C/2025 A6 认领 引用
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作者 Dongyue Jiang Lei Qian +14 位作者 Minglei Guo Qiaoli Hao Menglin Huang Peng Jiang Hongfei Liu Chun Sun Xingyi Wang Qingliang Yang Naiping Yu Lei Zhao Yutao Zhao Liyun Zhang Yichi Zhang Tongjie Zhang Zhichen Pan 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第6期7-13,共7页
We observed comet C/2025 A6 with the Five-hundred-meter Aperture Spherical radio Telescope(FAST)equipped with the ultra-wideband receiver from 2025 October 23 to November 8,and it was the first detection for this come... We observed comet C/2025 A6 with the Five-hundred-meter Aperture Spherical radio Telescope(FAST)equipped with the ultra-wideband receiver from 2025 October 23 to November 8,and it was the first detection for this comet with FAST.Through trapezoidal fitting of the OH line profiles,we derived the expansion velocities of the water which showed an increase from 1.5±0.3 km s-1at the heliocentric distance of 0.65 au to 3.0±0.9 km s-1at 0.54 au.Based on these results,we estimated the OH production rates of C/2025 A6 for October 23,October 26,November 4 and November 5 which were(1.0±0.1)×1029,(1.2±0.1)×1029,(1.4±0.3)×1029,and(1.5±0.4)×1029s-1 respectively.The results show a significant upward trend。 展开更多
关键词 methods:observational comets:general comets:individual(C/2O25 A6)
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