CHARACTERISTICS OF BOUNDARY LAYER AND ITS EFFECTS ON ATMOSPHERIC AEROSOL CONCENTRATIONS IN DONGGUAN, GUANGDONG |
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| Authors: | XIA Dong FAN Shao-jia and LIAO Zhi-heng |
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| Institution: | Dongguan Meteorological Observatory, Dongguan, Guangdong 523086 China; School of Environmental Science and Engineering, Sun Yat Sen University, Guangzhou 510275 China |
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| Abstract: | The structure of atmospheric boundary layer determines the ability of atmospheric dispersion and has an essential impact on airborne aerosols. In this paper, the data of a radio sounding experiment held in Dongguan National Meteorological Observation Station, which is in a coastal city in Pearl River Delta, as well as the data of atmospheric aerosols, were utilized in order to analyze the characteristics of atmospheric boundary layer and its effects on surface aerosol concentrations. The results are showed at follows: the local circulations, associated with dominant winds, made complex structures of atmospheric layers, as the cold air and systematic winds weakened in the end of a cold air event. Weakened wind shears and inversion layers, especially a strong near-surface inversion layer, remarkably diminished the atmospheric diffusion abilities and facilitated an especially high concentration of surface aerosols. The convergence line or weak shear line of sea breeze in the ground level helps weaken the atmospheric diffusion abilities and results in atmospheric aerosols accumulation. |
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| Keywords: | boundary layer characteristics aerosol concentration radio sounding Dongguan |
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