Number concentration of submicron aerosols at a rural site during summer harvest period
ZHENG Shu-rui1, KONG Shao-fei1, YAN Qin1, WU Jian1, ZHU Ge-hao1, YANG Guo-wei1, WU Fang-qi1, NIU Zhen-zhen1, ZHENG Ming-ming1,2, ZHENG Huang1, CHENG Yi1, CHEN Nan2, XU Ke2, QI Shi-hua1,3
1. School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;
2. Hubei Environmental Monitoring Center, Wuhan 430074, China;
3. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
A Scanning Mobility Particle Sizer was deployed at a typical rural site in North China Plain during June 2017 to study number concentration and size distribution of atmospheric submicron particles from the view of source regions. Results showed that the particles less than 300nm were dominant and the average particle number concentration was 28371cm-3. The distribution of particle number concentration in different modes showed obvious differences:Nucleation mode (<20nm) was linear distribution; Aitken mode (20~100nm) was multinomial distribution; Accumulation mode (>100nm) was logarithmic distribution. Result of 48h backward trajectories indicated that the total number concentration of particles increased by 66.7%, when the air masses were mainly affected by the biomass burning transmitting from the Jiangsu, Shandong and Anhui provinces. Potential source contribution function and concentration-weighted trajectory analysis demonstrated that potential source regions of particles were located in the east of the observation site, and the particles with particle diameter less than 100nm were dominant.
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