一次冷锋过程中我国区域空气污染边界层特征

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Abstract Using radiosonde and weather station data, reanalysis data of ERA-interim, and national PM_2.5 concentration data, a cold front process during March 7 to 11, 2015 and its impact on air pollution were discussed. Our research focused on the circulation features at different levels of air, the vertical structure of the meteorological factors in the boundary layer and its spatiotemporal evolution characteristics from the north to south at six sites (Beijing, Zhangqiu, Zhengzhou, Nanyang, Wuhan, Changsha) during the southward moving process of the cold front. The results showed that in the first stage of the air pollution event (7~8March), the zonal circulation at 500hPa and the surface pressure field were even, and generated favorable conditions for the accumulation of air pollutants. In the second stage of the event (8~10March), the regions with heavy pollution were generally located in front of the cold high with weak pressure gradient, and moving southward accompanying the southward movement of the cold front. With the passing of the weather system, the boundary layer characteristics at six sites showed a similar feature of multi-level inversion occurring sequentially in time, and from north to south in space. The wind speed was low, and the relative humidity was high within the inversion layer. The formation of this multi-level inversions was due to the near-surface radiation cooling at night, frontal inversion of the moving cold front, and air sinking above the boundary layer. This study revealed that in a moving weather system, the boundary layer structures in the same part of the weather system had common characteristics, which were related closely to the occurring of air pollution.

Key words： air pollution weather systems moving boundary layer structure multi-level inversion

Received: 22 February 2020

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X513

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	Articles by authors
	ZHANG Chen
	ZHU Bin
	LIU Xiao-hui
	HOU Xue-wei
	MU Nan-nan
	KANG Han-qing
	WANG Li-juan

Cite this article:

ZHANG Chen,ZHU Bin,LIU Xiao-hui等. Boundary layer characteristics of an air pollution event in China during a cold front[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4284-4291.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I10/4284

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