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    题名 作者 年代 出处 被引量
1Evolution of particle number size distribution in an urban atmosphere during episodes of heavy pollution and new particle formation显示文摘This study discusses the evolution of particle number size distribution during episodes of heavy pollution and new particle formation in the urban atmosphere of Beijing to quantify the effects of dynamic processes (coagulation and condensation) on the particle number size distribution.During a heavy-pollution event,an extremely low number concentration of 3-10 nm particles (on average 46 cm-3) was observed.This is because nucleation-mode particles were easily removed by strong coagulational scavenging of larger particles under this condition.In addition,a large condensation sink (on average 0.13 s-1) restrained nucleation,which is one of the major sources of nucleation-mode particles.Conversely,during a new-particle formation event,the small condensation sink (0.01 s-1) of precursor facilitated nucleation.At the same time,preexisting particles had little ability to scavenge newly formed particles (around 1 nm) and allowed them to grow to a detectable size (larger than 3 nm currently).We suggest that the effects of dynamic processes (coagulation and condensation) on particle size distribution should be stressed under some extreme conditions of the relatively polluted urban atmosphere in addition to traffic and meteorological factors.WU ZhiJun, HU Min YUE DingLi Birgit WEHNER Alfred WIEDENSOHLER 2011Science China Earth Sciences2011,54,11:8
2Ambient volatile organic compounds at a receptor site in the Pearl River Delta region:Variations,source apportionment and effects on ozone formation显示文摘We present the continuously measurements of volatile organic compounds(VOCs)at a receptor site(Wan Qing Sha,WQS)in the Pearl River Delta(PRD)region from September to November of 2017.The average mixing ratios of total VOCs(TVOCs)was 36.3±27.9 ppbv with the dominant contribution from alkanes(55.5%),followed by aromatics(33.3%).The diurnal variation of TVOCs showed a strong photochemical consumption during daytime,resulting in the formation of ozone(O_(3)).Five VOC sources were resolved by the positive matrix factorization(PMF)model,including solvent usage(28.6%),liquid petroleum gas(LPG)usage(24.4%),vehicle exhaust(21.0%),industrial emissions(13.2%)and gasoline evaporation(12.9%).The regional transport air masses from the upwind cities of south China can result in the elevated concentrations of TVOCs.Low ratios of TVOCs/NO_(x)(1.53±0.88)suggested that the O_(3) formation regime at WQS site was VOC-limited,which also confirmed by a photochemical box model with the master chemical mechanism(PBM-MCM).Furthermore,the observation on high-O_(3) episode days revealed that frequent O_(3) outbreaks at WQS were mainly caused by the regional transport of anthropogenic VOCs especially for aromatics and the subsequent photochemical reactions.This study provides valuable information for policymakers to propose the effective control strategies on photochemical pollution in a regional perspective.Yao Meng Junwei Song Lewei Zeng Yingyi Zhang Yan Zhao Xufei Liu Hai Guo Liuju Zhong Yubo Ou Yan Zhou Tao Zhang Dingli Yue Senchao Lai 2022Journal of Environmental Sciences2022,34,1:5
3The roles of sulfu- ric acid in new particle formation and growth in the mega-city of Bejing显示文摘YUE Dingli H U Min Z HANG Renyi 2010Atmospheric Chemistry and Physics2010,10,10:1
4Chemical characteristics of fine particles during spring dust storm dominant period in two Chinese cities, Baotou and Wuwei显示文摘Min HU Fan YANG Dingli YUE Song GUO Mengting WEN Wenting ZHANG Feng TIAN 2006Chinese Journal Of Geochemistry2006,25,B08:1
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