四川盆地多层逆温特征及其对大气污染的影响

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Abstract The radiosonde data and the ambient air quality data, released by Ministry of Ecology and Environment of the People's Republic of China, in the Sichuan Basin from 2015 to 2018 were used in this study. The aim was to document the special multi-layer inversion structure in the Sichuan Basin, which has not been reported in detail, as well as to evaluate the effects of different inversion types and vertical structures on air pollution. The result showed that the multi-layer inversion in the Sichuan Basin was actually a common phenomenon, with an average annual frequency of 20.1%. It occurred most frequently in winter and the wintertime frequency in Chengdu reaches 51.6%. The multi-layer inversions were mainly characterized by the boundary layer inversion overlaid with the lower troposphere inversion (LTI). They are divided into four types according to the vertical structure. That is, the surface-based inversion (SI) overlaid with the elevated inversion (EI), SI+LTI, EI+LTI, and SI+EI+LTI, correspond to type I, Ⅱ, Ⅲ, and IV multi-layer inversions, respectively. Most were type Ⅱ and Ⅲ. The superimposing effect of the inversions had more serious impact on air pollution than non-multi-layer inversions. The multi-layer inversions, especially type Ⅱ and IV, made more important contribution to increasing the possibility of moderate and heavy pollution. Among the four types, type I and IV multi-layer inversions had the most obvious inhibitory effect on diffusion of air pollutants, with type Ⅱ multi-layer inversion and only-SI followed. In winter, the most polluted season of a year, the type Ⅱ multi-layer inversions were frequent, deep, and strong, and had an obvious superimposing effect on air pollution. Thus, it should be the focus of attention.

Key words： multi-layer inversions vertical structure air pollution superimposing effect Sichuan Basin

Received: 13 July 2020

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	WEI Shi-min
	FENG Xin-yuan
	WANG Shi-gong
	ZHANG Zheng-zi

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WEI Shi-min,FENG Xin-yuan,WANG Shi-gong等. Characteristics of multi-layer inversions in Sichuan Basin and their influences on air pollution[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1005-1013.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I3/1005

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