Observation of aerosol size distribution and new particle formation at a coastal city in the Yangtze River Delta, China.
Aerosol number size distribution in the range of 10nm-10μm, trace gases (O3, CO, SO2 and NO2), particular matter (PM: PM2.5 and PM10) and meteorological elements were measured from the 1st to the 31st of May, 2015, in the coastal city of Jiaxing in the Yangtze River Delta (YRD). The average number concentration and surface area concentration were 19,639cm(-3) and 427μm(2)cm(-3) during the observation period. The different mode particle concentrations ranked in the order of Aitken mode (12,361cm(-3))>nucleation (4926.7cm(-3))>accumulation (2349.3cm(-3))>coarse mode (1.7cm(-3)). The average concentrations of CO, SO2, NO2, O3, PM2.5 and PM10 were 0.545mgm(-3), 14.7, 35.1, 89.8, 43.5 and 64.6μgm(-3), respectively. Eight precipitation processes and 15 new particle formation (NPF) events (3 NPF events occurred on a rainy day) were observed. Results show that the precipitation process had greater scavenging effects on particles smaller than 120nm and larger than 2μm. The spectral distributions of number concentrations were unimodal at different weather conditions, with peaks at 20nm, 40-60nm, 50-80nm on NPF days, rainy days and normal days. During the NPF events, the formation rate (FR), growth rate (GR), condensational sink (CS), vapor source rate (Q) and condensing vapor concentration (C) were in the range of 4.0-17.0cm(-3)s(-1), 2.2-15.7nmh(-1), 1.5-5.8×10(-2)s(-1), 0.5-7.7×10(6)cm(-3)s(-1) and 3.0-21.5×10(7)cm(-3), with mean values of 9.6cm(-3)s(-1), 6.8nmh(-1), 3.4×10(-2)s(-1), 3.3×10(6)cm(-3)s(-1) and 9.4×10(7)cm(-3), respectively. NPF events normally occurred under clean atmospheric conditions with low PM concentrations but high levels of trace gases. It was also found that SO2 plays an important role in NPF and growth in Jiaxing.
Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control (AEMPC), School of Environmental Sciences and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China; Jiaxing Environmental Monitoring Station, Jiaxing 314000, China.
Lijuan
L
Shen
Key Laboratory of Meteorological Disaster, Ministry of Education (KLME), Joint International Research Laboratory of Climate and Environment Change (ILCEC), Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing 210044, China. Electronic address: hongleiwang_2009@163.com.
Honglei
H
Wang
Jiaxing Environmental Monitoring Station, Jiaxing 314000, China.
Sheng
S
Lü
Jiaxing Environmental Monitoring Station, Jiaxing 314000, China.
Li
L
Li
Jiaxing Environmental Monitoring Station, Jiaxing 314000, China.
Jing
J
Yuan
Jiaxing Environmental Monitoring Station, Jiaxing 314000, China.
Xiaohan
X
Zhang
Zhejiang Environmental Monitoring Center, Hangzhou 310000, China.
Xudong
X
Tian
Zhejiang Environmental Monitoring Center, Hangzhou 310000, China.
Qian
Q
Tang
D000336:Aerosols / Q000032:analysis*; D000393:Air Pollutants / Q000032:analysis*; D002681:China; D002947:Cities; D004784:Environmental Monitoring; D005740:Gases / Q000032:analysis*; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D014887:Weather
D000336:Aerosols; D000393:Air Pollutants; D005740:Gases; D052638:Particulate Matter
Aerosol number concentration; Coastal city; New particle formation; Size distribution; Trace gases