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Size Distributions and Sources Apportionment of Aerosol Number Concentrations over the Eastern Qinghai-Tibet Plateau, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2023年第01期
Page:
80-92
Research Field:
环境与可持续发展
Publishing date:

Info

Title:
Size Distributions and Sources Apportionment of Aerosol Number Concentrations over the Eastern Qinghai-Tibet Plateau, China
Author(s):
SHEN Li-juan1;  WANG Hong-lei2*;  ZHAO Tian-liang2;  SHI Shuang-shuang1;  LU Wen2
(1. School of Atmosphere and Remote Sensing, Wuxi University, Wuxi 214105, Jiangsu, China; 2. Key Laboratory for Aerosol-cloud-precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu, China)
Keywords:
aerosol;  PM2.5;  gas pollutant;  size distribution;  diurnal variation;  potential source;  affecting area;  Qinghai-Tibet Plateau
PACS:
X513
DOI:
10.19814/j.jese.2022.10050
Abstract:
The spatio-temporal variation of aerosol size distribution, which indicates the primary and secondary sources of atmospheric aerosols, can reflect the dynamic and chemical processes that they were subjected to. A wide-range particle size spectrometer was used to observe the aerosol size distributions(10 nm-10 μm)in Litang county of Sichan province over the eastern Qinghai-Tibet Plateau from July 6 to August 3, 2017. Combining with the data of six atmospheric pollutants(PM2.5, PM10, SO2, NO2, CO, and O3), meteorological elements, trajectory model of HYSPLIT, potential source contribution function(PSCF)and concentration-weighted trajectory(CWT)analysis, the size distributions, potential sources and affecting areas of aerosols on the eastern margin of Qinghai-Tibet Plateau were discussed. The results show that the average aerosol number concentration is 4 660.3 cm-3 in Litang area, and mainly concentrates below 500 nm, which accounts for 99.95% of total number concentration; the aerosol number concentrations in different modes of particle vary greatly, that of nucleation mode, Aitken mode, accumulation mode, and coarse mode of particle are 391.9, 4 218.0, 50.1, and 0.4 cm-3, respectively; meanwhile, the diurnal variations of aerosol number concentration in different modes of particle are all bimodal distributions, with a discrepancy in the peak time, which is located at 12:00 and 19:00 for the nucleation mode of particle, and at 08:00 and 20:00 for the Aitken mode, accumulation mode and coarse mode of particle; the spectrum of aerosol number concentration and surface area concentration has both unimodal distributions with peaks at 50 nm and 170 nm, respectively, the peak concentrations of which are 7 361.9 cm-3·nm-1 and 215.5 μm2·cm-3·nm-1, accordingly. Finally, the potential sources of aerosol number concentration with high PSCF values in Litang area include two areas, which are a local polluted region in the northeast and a foreign region in the southwest triggered by the long range transport process. Conversely, the affecting areas of the aerosol number concentration in the eastern Qinghai-Tibet Plateau are mainly in the domestic region, and the affecting areas with high PSCF value are relatively scattered.

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