Cai, Qiuliang
(Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences)
,
Tong, Lei
(Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences)
,
Zhang, Jingjing
(Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences)
,
Zheng, Jie
(Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences)
,
He, Mengmeng
(Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences)
,
Lin, Jiamei
(Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences)
,
Chen, Xiaoqiu
(Environmental Monitoring Center of Fujian)
,
Xiao, Hang
(Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences)
Air pollution has attracted ever-increasing attention because of its substantial influence on air quality and human health. To better understand the characteristics of long-range transported pollution, the single particle chemical composition and size were investigated by the single particle aerosol...
Air pollution has attracted ever-increasing attention because of its substantial influence on air quality and human health. To better understand the characteristics of long-range transported pollution, the single particle chemical composition and size were investigated by the single particle aerosol mass spectrometry in Fuzhou, China from 17th to 22nd January, 2016. The results showed that the haze was mainly caused by the transport of cold air mass under higher wind speed (10 m·s-1) from the Yangtze River Delta region to Fuzhou. The number concentration elevated from 1,000 to 4,500 #·h-1, and the composition of mobile source and secondary aerosol increased from 24.3% to 30.9% and from 16.0% to 22.5%, respectively. Then, the haze was eliminated by the clean air mass from the sea as indicated by a sharp decrease of particle number concentration from 4,500 to 1,000 #·h-1. The composition of secondary aerosol and mobile sources decreased from 29.3% to 23.5% and from 30.9% to 23.1%, respectively. The particles with the size ranging from 0.5 to 1.5 ㎛ were mainly in the accumulation mode. The stationary source, mobile source, and secondary aerosol contributed to over 70% of the potential sources. These results will help to understand the physical and chemical characteristics of long- range transported pollutants.
Air pollution has attracted ever-increasing attention because of its substantial influence on air quality and human health. To better understand the characteristics of long-range transported pollution, the single particle chemical composition and size were investigated by the single particle aerosol mass spectrometry in Fuzhou, China from 17th to 22nd January, 2016. The results showed that the haze was mainly caused by the transport of cold air mass under higher wind speed (10 m·s-1) from the Yangtze River Delta region to Fuzhou. The number concentration elevated from 1,000 to 4,500 #·h-1, and the composition of mobile source and secondary aerosol increased from 24.3% to 30.9% and from 16.0% to 22.5%, respectively. Then, the haze was eliminated by the clean air mass from the sea as indicated by a sharp decrease of particle number concentration from 4,500 to 1,000 #·h-1. The composition of secondary aerosol and mobile sources decreased from 29.3% to 23.5% and from 30.9% to 23.1%, respectively. The particles with the size ranging from 0.5 to 1.5 ㎛ were mainly in the accumulation mode. The stationary source, mobile source, and secondary aerosol contributed to over 70% of the potential sources. These results will help to understand the physical and chemical characteristics of long- range transported pollutants.
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문제 정의
However, the research on the mixture state, size distribution and evolution processes of long-range transported aerosol particles are still insufficient. The main purpose of this study is to further investigate the rapid variations of chemical compositions, size and sources of fine particle during the formation and dissipation processes of haze, which was caused by the long-range transported pollutants. Therefore, it could help to improve the understanding on haze evolution.
제안 방법
The particles were manually clustered into six groups (95% of whole particles number), i.e. EC (element carbon) based on Cn± (n = 1,3,4,5 …), organic carbon (OC) based on high signal levels of 27, 43 (m/z) along with peaks near 50 (m/z) and peaks near 60 (m/z), K-rich based on high signal levels of 39 (m/z), heavy metals based on signal peak of Pb (206, 207, 208), Zn (64, 66, 68), Cu (63, 65), etc., dust based on signal peak of Ca+ (40) and SiO3- (-76), and secondary aerosol based on high signal levels of nitrate (-46, -62) and sulfate (-80, -97).
This study investigated the single particle chemical composition and particle size of ambient aerosol using the SPAMS in Fuzhou, China from January 17th to 22nd, 2016. The haze formation was mainly caused by the long-range transported air pollutants from the Yangtze River Delta region to Fujian Province along the coastline.
대상 데이터
5 mass concentration was calculated based on hourly average data. Meteorological data including air temperature (T), relative humidity (RH), visibility (Vis), and wind speed (WS)/wind direction (WD) was obtained from the website of the weather company (https://www.wunderground.com, an IBM Business, formerly WSI).
The model is in nested domains, which covers East China with 15 km × 15 km horizontal resolution and has 180 grids in the latitudinal and longitudinal directions, respectively.
The monitoring site is situated on the rooftop of an office block in Fujian Environmental Monitoring Station (119.29 °E, 26.11 °N), which is situated in a typical governmental and residential area with large residential and traffic sources (Fig. S1).
이론/모형
5 included sulfate, nitrate, ammonium salt, black carbon (BC), and dust. The initial and boundary conditions were engaged in the results of a global model (MOZARTv2.4), which was jointly developed by the American Nation Center for Atmospheric Research (NCAR), the Max Planck Institute for meteorology, Germany (MPI), the Global Fluid mechanics research Laboratory (GFDL), and the American Nation Oceanic Atmosphere Administration (NOAA). Fig.
성능/효과
It was shown that the proportions of secondary aerosols and mobile sources decreased with the increase of the particle size in the range of 0.6 to 1.8 μm (Fig.
Based on previous discussion, the air quality at the study site was regarded to be strongly influenced by the long-range transported air pollutants during the periods of T1 and T2, while it was mainly influenced by local emissions during other time periods. Therefore, the correlations were greatly improved, with R values increasing to 0.95 and 0.85 for periods when the sampling site was affected by the long-range transport and local emissions, respectively. These suggested that the source apportionment for the mobile source emissions was generally reliable.
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