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| 1 | Effects of relative humidity and PM2.5 chemical compositions on visibility impairment in Chengdu, China显示文摘To better understand the potential causes of visibility impairment in autumn and winter in Chengdu,relative humidity(RH),visibility,the concentrations of PM2.5 and its chemical components were on-line measured continuously in Chengdu from Nov.2016 to Jan.2017.Six obvious haze episodes occurred in Chengdu,with the total time of haze episodes accounted for more than 90%of the total observation period,and higher NO2 concentrations and RH were related to the high particle concentrations in haze episodes.The visibility decreased in a non-linear tendency under different RH conditions with the increase of PM2.5 concentrations,which was more sensitive to RH under lower PM2.5 concentrations.The threshold concentration of PM2.5 got more smaller with the increase of RH.During the entire observation period,organic matter(OM)was the largest contributor(31.12%to extinction coefficient(bext)),followed by NH4NO3 and(NH4)2SO4 with 28.03%and 23.01%,respectively.However,with the visibility impairment from Type I(visibility>10 km)to Type IV(visibility≤2 km),the contribution of OM to bextdecreased from 38.12%to 26.77%,while the contribution of NH4NO3 and(NH4)2SO4 to bextincreased from 19.09%and 20.20%to 34.29%and 24.35%,respectively,and NH4NO3 became the largest contributor to bextat Type IV.The results showed that OM and NH4NO3 were the key components of PM2.5 for visibility impairment in Chengdu,indicating that the control of precursors emissions of carbonaceous species and NH4NO3 could effectively improve the visibility in Chengdu. | Fan Liu Qinwen Tan Xia Jiang Fumo Yang Wenju Jiang | 2019 | Journal of Environmental Sciences2019，31，12： | 21 |
| 2 | Characteristics of carbonaceous aerosols in Beijing, China显示文摘 | Fengkui Duan Kebin He Yongliang Ma Yingtao Jia Fumo Yang Yu Lei S. Tanaka T. Okuta | 2005 | Chemosphere2005，，3： | 3 |
| 3 | Using Si depletion in aerosol to identify the sources of crustal dust in two Chinese megacities显示文摘 | Qing Zhao Kebin He Kenneth A. Rahn Yongliang Ma Fumo Yang Fengkui Duan | 2010 | Atmospheric Environment2010，，21： | 1 |
| 4 | Characteristics of atmospheric non-methane hydrocarbons during high PM 10 episodes and normal days in Foshan, China显示文摘 | Songjun Guo Jihua Tan Yongliang Ma Fumo Yang Yongchan Yu Jiewen Wang | 2011 | Atmospheric Research2011，，3： | 1 |
| 5 | Characteristics of PM2 s speciation in representative megaeities and across China显示文摘 | YANG Fumo TAN Jihua ZHAO Qin | 2011 | Atmospheric Chemistry and Physics Discussions2011，11，： | 1 |
| 6 | Exhaust emission inventory of typical construction machinery and its contribution to atmospheric pollutants in Chengdu, China显示文摘To study the emission characteristics of typical construction machinery in Chengdu,12 construction machinery (excavators,bulldozers,loaders,and forklifts) under idling mode,moving mode,and working mode,were tested using a portable emission measurement system(PEMS).Under three operating modes,the typical construction machinery in the working mode was higher in the fuel-based average emission factors of PM_(2.5)and NOx,while the fuel-based average emission factors of HC and CO were higher in idling mode.Integrated the results of investigation on ownership and activity levels of construction machinery,an exhaust emission inventory of typical construction machinery of Chengdu in 2018 was established according to the recommendation method.The annual emission of PM_(2.5),NOx,HC,and CO were 1.67×106,1.61×108,3.83×106,and 1.26×107kg,respectively,and the excavator contributed the maximum emissions,accounting for an average proportion of 43.95%.The emission of construction machinery in Chengdu exhibited a clear monthly trend,with the highest from April to October and the lowest from November to March.In addition,the exhaust emissions presented an obvious spot-like characteristics,and the high-value areas were mainly concentrated in the surrounding suburban counties such as Shuangliu Wenjiang etc.To reduce pollution from construction machinery and improve the quality of the atmospheric environment,more effective measures on housing construction and municipal construction should be taken in those districts in Chengdu. | Wubo Fan Wenju Jiang Junhui Chen Fumo Yang Jun Qian Hong Ye | 2023 | Journal of Environmental Sciences2023，，3： | 1 |
| 7 | The characteristics of PM 2.5 in Beijing, China显示文摘 | Kebin He Fumo Yang Yongliang Ma Qiang Zhang Xiaohong Yao Chak K Chan Steven Cadle Tai Chan Patricia Mulawa | 2001 | Atmospheric Environment2001，，29： | 1 |
| 8 | Characteristics of carbonaceous aerosols in Beijing, China显示文摘 | Fengkui Duan Kebin He Yongliang Ma Yingtao Jia Fumo Yang Yu Lei S. Tanaka T. Okuta | 2005 | Chemosphere2005，，3： | 1 |
| 9 | The character- istics of PMas in Beijing, China显示文摘 | HE Kebin YANG Fumo MA Yongliang | 2001 | Atmospheric Environment2001，35，29： | 1 |
| 10 | An observed nocturnal ozone transport event in the Sichuan Basin,Southwestern China显示文摘The ozone(O_(3))pollution in China drew lots of attention in recent years,and the Sichuan Basin(SCB)was one of the regions confronting worsening O_(3)pollution problem.Many previous studies have shown that regional transport is an important contributor to O_(3)pollution.However,very few features of the O_(3)profile during transport have been reported,especially in the border regions between different administrative divisions.In this study,we conducted tethered balloon soundings in SCB during the summer of 2020 and captured a nocturnal O_(3)transport event during the campaign.Vertically,the O_(3)transport occurred in the bottom of the residual layer,between 200 and 500 m above ground level.Horizontally,the transport pathway was directed from southeast to northwest based on the analysis of the wind field and air mass trajectories.The effect of transport in the residual layer on the surface O_(3)concentration was related to the spatial distribution of O_(3).For cities with high O_(3)concentrations in the upwind region,the transport process would bring clean air masses and abate pollution.For downwind lightly polluted cities,the transport process would slow down the decreasing or even increase the surface O_(3)concentration during the night.We provided observational facts on the profile features of a transboundary O_(3)transport event between two provincial administrative divisions,which implicated the importance of joint prevention and control measures.However,the sounding parameters were limited and the quantitative analysis was preliminary,more integrated,and thorough studies of this topic were called for in the future. | Ruyue Guo Guangming Shi Dan Zhang Yang Chen Chao Peng Chongzhi Zhai Fumo Yang | 2024 | Journal of Environmental Sciences2024，，4： | 0 |
| 11 | Chemical characteristics of long-term acid rain and its impact on lake water chemistry:A case study in Southwest China显示文摘The chemical composition of acid rain and its impact on lake water chemistry in Chongqing,China,from 2000 to 2020 were studied in this study.The regional acid rain intensity is affected jointly by the acid gas emissions and the neutralization of alkaline substances.The pH of precipitation experienced three stages of fluctuating decline,continuous improvement,and a slight correction.Precipitation pH showed inflection points in 2010,mainly due to the total control actions of SO_(2)and NO_(x)implemented in 2011.The total ion concentrations in rural areas and urban areas were 489.08μeq/L and 618.57μeq/L,respectively.The top four ions were SO_(4)^(2-),Ca^(2+),NH_(4)^(+)and NO_(3)^(-),which accounted for more than 90%of the total ion concentration,indicating the anthropogenic effects.Before 2010,SO_(4)^(2-)fluctuated greatly while NO_(3)^(-)continued to rise;however,after 2010,both SO_(4)^(2-)and NO_(3)^(-)began to decline rapidly,with the rates of-12.03μeq/(L·year)and-4.11μeq/(L·year).Because the decline rate of SO_(4)^(2-)was 2.91 times that of NO_(3)^(-),the regional acid rain has changed from sulfuric acid rain to mixed sulfuric and nitric acid rain.The lake water is weakly acidic,with an average pH of 5.86,and the acidification frequency is 30.00%.Acidification of lake water is jointly affected by acid deposition and acid neutralization capacity of lake water.Acid deposition has a profound impact on water acidification,and nitrogen(N)deposition,especially reduced N deposition,should be the focus of future research. | Liuyi Zhang JiaWang Shuxiao Wang Chunbo Wang Fumo Yang Tingzhen Li | 2024 | Journal of Environmental Sciences2024，，4： | 0 |
| 12 | Data augmentation for bias correction in mapping PM_(2.5) based on satellite retrievals and ground observations显示文摘As most air quality monitoring sites are in urban areas worldwide,machine learning models may produce substantial estimation bias in rural areas when deriving spatiotemporal distributions of air pollutants.The bias stems from the issue of dataset shift,as the density distributions of predictor variables differ greatly between urban and rural areas.We propose a data-augmentation approach based on the multiple imputation by chained equations(MICE-DA)to remedy the dataset shift problem.Compared with the benchmark models,MICE-DA exhibits superior predictive performance in deriving the spatiotemporal distributions of hourly PM2.5 in the megacity(Chengdu)at the foot of the Tibetan Plateau,especially for correcting the estimation bias,with the mean bias decreasing from-3.4µg/m3 to-1.6µg/m3.As a complement to the holdout validation,the semi-variance results show that MICE-DA decently preserves the spatial autocorrelation pattern of PM2.5 over the study area.The essence of MICE-DA is strengthening the correlation between PM2.5 and aerosol optical depth(AOD)during the data augmentation.Consequently,the importance of AOD is largely enhanced for predicting PM2.5,and the summed relative importance value of the two satellite-retrieved AOD variables increases from 5.5%to 18.4%.This study resolved the puzzle that AOD exhibited relatively lower importance in local or regional studies.The results of this study can advance the utilization of satellite remote sensing in modeling air quality while drawing more attention to the common dataset shift problem in data-driven environmental research. | Tan Mi Die Tang Jianbo Fu Wen Zeng Michael L.Grieneisen Zihang Zhou Fengju Jia Fumo Yang Yu Zhan | 2024 | Geoscience Frontiers2024，15，1： | 0 |
| 13 | Progressively narrow the gap of PM_(2.5) pollution characteristics at urban and suburban sites in a megacity of Sichuan Basin, China显示文摘Nowadays,the fine particle pollution is still severe in some megacities of China,especially in the Sichuan Basin,southwestern China.In order to understand the causes,sources,and impacts of fine particles,we collected PM_(2.5)samples and analyzed their chemical composition in typical months from July 2018 to May 2019 at an urban and a suburban (background) site of Chengdu,a megacity in this region.The daily average concentrations of PM_(2.5)ranged from5.6-102.3μg/m^(3)and 4.3-110.4μg/m^(3)at each site.Secondary inorganics and organic matters were the major components in PM_(2.5)at both sites.The proportion of nitrate in PM_(2.5)has exceeded sulfate and become the primary inorganic component.SO_(2)was easier to transform into sulfate in urban areas because of Mn-catalytic heterogeneous reactions.In contrast,NO_(2)was easily converted in suburbs with high aerosol water content.Furthermore,organic carbon in urban was much greater than that in rural,other than elemental carbon.Element Cr and As were the key cancer risk drivers.The main sources of PM_(2.5)in urban and suburban areas were all secondary aerosols (42.9%,32.1%),combustion (16.0%,25.2%) and vehicle emission (15.2%,19.2%).From clean period to pollution period,the contributions from combustion and secondary aerosols increased markedly.In addition to tightening vehicle controls,urban areas need to restrict emissions from steel smelters,and suburbs need to minimize coal and biomass combustion in autumn and winter. | Ning Wang Li Zhou Miao Feng Tianli Song Zhuoran Zhao Danlin Song Qinwen Tan Fumo Yang | 2023 | Journal of Environmental Sciences2023，，4： | 0 |
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