沙尘天气对兰州市大气污染物置换和叠加作用

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Abstract Characteristics of the concentrations of particulate pollutants PM₁₀, PM_2.5 and gaseous pollutants SO₂, NO₂, CO and O₃ during spring dust storms in 2014 and 2015 were analyzed. The result showed that dust storms could cause the increasement of PM₁₀ and PM_2.5 for both the replacement type and the addition type, while the decreasement of SO₂、NO₂ and CO for the replacement type, while the increasement for the addition type. However, the concentration of O₃ almost kept stable during spring dust storms. For the replacement type, the average concentrations of PM₁₀ and PM_2.5 were 1086.9 and 286μg/m³ respectively, and those of SO₂, NO₂ and CO were 6.7, 41.0 and 1.02×10³μg/m³ respectively. For the addition type, the average concentrations of PM₁₀ and PM_2.5 were 383.2 and 116.2μg/m³ respectively, and those of SO₂, NO₂ and CO were 24.5, 49.1 and 1.19×10³μg/m³ respectively. In short, the average concentrations of PM₁₀ and PM_2.5 of the replacement type were 2.8 and 2.4 times more than those of the addition type, and the average concentrations of SO₂, NO₂ and CO of the replacement type were 1.47, 1.2 and 1.17times more than those of the addition type. The meteorological conditions of the replacement type were strong northeast wind near surface, significant temperature decreasement and high pressure. In other words, strong cold air activity resulted in increase of PM₁₀ and PM_2.5 and decrease of SO₂, NO₂ and CO. The dust sources of this type were in Taklimakan Desert and the northern part of Qinghai Tibet Plateau, and the influence flow were high-altitude northwest wind at the height of 1500 to 6000 meters. However, the meteorological conditions of the addition type were weak northeast wind near surface, no significant change of temperature and pressure. In other words, weak cold air activity resulted in increacement of PM₁₀ and PM_2.5 and decreacement of SO₂, NO₂ and CO at the early stage. And then, the concentrations of PM₁₀ and PM_2.5 kept at high levels, and the concentrations of SO₂, NO₂ and CO start to rise. The dust source of this type were mainly in Badan Jilin desert, and the influence flow was low-altitude northwest wind below 1500meters.

Key words： dust weahter lanzhou air pollutants replacement addition

Received: 29 September 2017

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	Articles by authors
	LIU Xiao-ran
	WANG Jin-yan
	QIU Ji-yong
	LI Quan-xi
	DONG Ji-yuan
	WEI Lin-bo

Cite this article:

LIU Xiao-ran,WANG Jin-yan,QIU Ji-yong等. Influence of dust storms on air pollution for replacement and addition in Lanzhou[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(5): 1646-1652.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I5/1646

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