石家庄一次沙尘大气污染物与边界层相互作用

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Abstract A dust storm was occurred in North China plain and recorded on May 11~12, 2020. A ground-based ceilometers and an aircraft King-air 350 were in operation to record and observe the dust storm. Data retrieved from these instruments were analyzed, including aerosol backscatter coefficients, meteorological variables, black carbon (BC), and the vertical distribution of aerosol size ranging from 0.1 to 3.0μm. Additional satellite data from FY-4A, hourly data of atmospheric pollutants (PM_2.5, PM₁₀, SO₂, NO₂, CO, and O₃), ground meteorological data, and vertical soundings were all analyzed conjointly for investigating the interaction between atmospheric pollutants and boundary. As a result of the thermal inversion layer, the dust only existed above Shijiazhuang over the height of 1km, hence a limited influence on surface pollutants. During this dusty weather, the average mass concentration of PM₁₀ was measured as 166.3μg·m^-3, which was 2.7 times and 1.5 times higher than before and after the dust storm, respectively. A "domelike" structure formed due to the dust storm indicated a strong impact from this weather on the boundary layer. This dome was found near the dust layer and characterized based on a feature consisting of low RH, high wind speed, and high aerosol concentration. The existence of this structure can hinder the development of the boundary layer, and further, the inexistence of ground inversion is responsible for the diffusion of near-surface pollutants. Within the dusty atmosphere, the concentration of BC and aerosols were relatively high as the maximum value of both pollutants were close to the ground observations. The number spectrum of aerosols at different altitudes showed an insignificant correlation with the dust storm. However, the aerosol concentration archived increased notably for those at a size of 0.4~3.0μm related to this storm.

Key words： dust storm aircraft observation BC aerosol atmospheric boundary layer

Received: 03 August 2020

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X513

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	DONG Xiao-bo
	MAI Rong
	WANG Hong-lei
	YANG Yang
	ZHAO Li-wei
	SHU Zhi-yuan
	ZHANG Xiao-rui

Cite this article:

DONG Xiao-bo,MAI Rong,WANG Hong-lei等. An interaction study between atmospheric pollutants and boundary layer during a dust storm weather in Shijiazhuang[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1024-1033.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I3/1024

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