MEASUREMENTS OF PARTICLE NUMBER SIZE DISTRIBUTIONS AND NEW PARTICLE FORMATION EVENTS DURING WINTER IN THE PEARL RIVER DELTA REGION,CHINA  

作　　者：谭浩波 银燕 李菲 刘显通 陈柏纬 邓涛 邓雪娇 万齐林 吴兑 

机构地区：[1]Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction,CMA,Guangzhou 510080 China [2]Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 210044 China [3]Hong Kong Observatory,Hong Kong China

出　　处：《Journal of Tropical Meteorology》2016年第2期191-199,共9页热带气象学报（英文版）

基　　金：Natural Science Foundation of China(41375156);Natural Science Foundation of Guangdong Province,China(S2013010013265);Special R&D fund for research institutes(2014EG137243);National Key Project of Basic Research(2011CB403403);Science and Technology Planning Project for Guangdong Province(2012A061400012)

摘　　要：Particle number size distribution(PNSD) between 10 nm and 20 μm were measured in the Pearl River Delta(PRD) region in winter 2011.The average particle number concentration of the nucleation mode(10-20 nm),Aitken mode(20-100 nm),accumulation mode(100 nm-1μm) and coarse mode(1-20 μm) particles were 1 552,7 470,4 012,and 19 cm-3,respectively.The volume concentration of accumulation mode particles with peak at 300 nm accounted for over 70% of the total volume concentration.Diurnal variations and dependencies on meteorological parameters of PNSD were investigated.The diurnal variation of nucleation mode particles was mainly influenced by new particle formation events,while the diurnal variation of Aitken mode particles correlated to the traffic emission and the growth process of nucleation mode particles.When the PRD region was controlled by a cold high pressure,conditions of low relative humidity,high wind speed and strong radiation are favorable for the occurrence of new particle formation(NPF) events.The frequency of occurrence of NPF events was 21.3% during the whole measurement period.Parameters describing NPF events,including growth rate(GR) and source rate of condensable vapor(Q),were slightly larger than those in previous literature.This suggests that intense photochemical and biological activities may be the source of condensable vapor for particle growth,even during winter in the PRD.Particle number size distribution（PNSD） between 10 nm and 20 μm were measured in the Pearl River Delta（PRD） region in winter 2011.The average particle number concentration of the nucleation mode（10-20 nm）,Aitken mode（20-100 nm）,accumulation mode（100 nm-1μm） and coarse mode（1-20 μm） particles were 1 552,7 470,4 012,and 19 cm-3,respectively.The volume concentration of accumulation mode particles with peak at 300 nm accounted for over 70% of the total volume concentration.Diurnal variations and dependencies on meteorological parameters of PNSD were investigated.The diurnal variation of nucleation mode particles was mainly influenced by new particle formation events,while the diurnal variation of Aitken mode particles correlated to the traffic emission and the growth process of nucleation mode particles.When the PRD region was controlled by a cold high pressure,conditions of low relative humidity,high wind speed and strong radiation are favorable for the occurrence of new particle formation（NPF） events.The frequency of occurrence of NPF events was 21.3% during the whole measurement period.Parameters describing NPF events,including growth rate（GR） and source rate of condensable vapor（Q）,were slightly larger than those in previous literature.This suggests that intense photochemical and biological activities may be the source of condensable vapor for particle growth,even during winter in the PRD.

关 键 词：aerosol particle number size distribution new particle formation Pearl River Delta 

分 类 号：O572.33[理学—粒子物理与原子核物理] TH122[理学—物理]