Characteristics of long-range transported PM2.5 at a coastal city using the single particle aerosol mass spectrometry

Cai, Qiuliang; Tong, Lei; Zhang, Jingjing; Zheng, Jie; He, Mengmeng; Lin, Jiamei; Chen, Xiaoqiu; Xiao, Hang

doi:.0..

DOI: https://doi.org/10.4491/eer.2018.354

Characteristics of long-range transported PM2.5 at a coastal city using the single particle aerosol mass spectrometry

Qiuliang Cai^1,2,3, Lei Tong^1,2, Jingjing Zhang^1,2,3, Jie Zheng^1,2, Mengmeng He^1,2, Jiamei Lin^1,2,3, Xiaoqiu Chen⁴^†, and Hang Xiao^1,2^†

¹Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
²Ningbo Urban Environment Observation and Research Station-NUEORS, Chinese Academy of Sciences, Ningbo 315830, Chin
³University of Chinese Academy of Sciences, Beijing 100049, China
⁴Environmental Monitoring Center of Fujian, Fuzhou 350003, China

Corresponding Author: Xiaoqiu Chen ,Tel: + 86-592-6190776, Fax: +66-2-2547-768 , Email: hxiao@iue.ac.cn, chenxq@fjemc.org.cn
Hang Xiao ,Tel: + 86-592-6190776, Fax: +66-2-2547-768 , Email: hxiao@iue.ac.cn, chenxq@fjemc.org.cn

Received: October 7, 2018; Accepted: January 13, 2019.

ABSTRACT

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 (SPAMS) 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 1000 to 4500 #·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 µm 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.

Keywords: PM2.5 | Particle Number | Particle Size | PSCF | SPAMS