Measurement report: Vehicle-based multi-lidar observational study of the effect of meteorological elements on the three-dimensional distribution of particles in the western Guangdong–Hong Kong–Macao Greater Bay Area
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Published:2022-01-05
Issue:1
Volume:22
Page:139-153
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Xu Xinqi,Xie Jielan,Li Yuman,Miao Shengjie,Fan Shaojia
Abstract
Abstract. The distribution of meteorological elements has always
been an important factor in determining the horizontal and vertical
distribution of particles in the atmosphere. To study the effect of
meteorological elements on the three-dimensional distribution structure of
particles, mobile vehicle lidar and fixed-location observations were
collected in the western Guangdong–Hong Kong–Macao Greater Bay Area of
China during September and October in 2019 and 2020. Vertical aerosol
extinction coefficient, depolarization ratio, and wind and temperature
profiles were measured using a micro pulse lidar, a Raman scattering lidar,
and a Doppler wind profile lidar installed on a mobile monitoring vehicle.
The mechanism of how wind and temperature in the boundary layer affects the
horizontal and vertical distribution of particles was analysed. The results
show that particles were mostly distributed in downstream areas on days with
moderate wind speed in the boundary layer, whereas they were distributed
homogeneously on days with weaker wind. There are three typical types of
vertical distribution of particles in the western Guangdong–Hong
Kong–Macao Greater Bay Area (GBA): surface single layer, elevated single
layer, and double layer. Analysis of wind profiles and Hybrid Single-Particle Lagrangian Integrated Trajectory Model (HYSPLIT) backward trajectory reveals different sources of particles for the three types.
Particles concentrating near the temperature inversion and multiple
inversions could cause more than one peak in the extinction coefficient
profile. There were two mechanisms affecting the distribution of particulate
matter in the upper and lower boundary layers. Based on this observational
study, a general model of meteorological elements affecting the vertical
distribution of urban particulate matter is proposed.
Funder
National Natural Science Foundation of China
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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