广州旱季双高污染及消光系数垂直分布特征

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Abstract Based on regular surface observation meteorological data, data of six kinds of air quality parameters, actinic radiation data, aerosol scattering and absorption coefficients, single scattering albedo, and aerosol extinction coefficient and depolarization ratio retrieved by lidar data from December 6, 2017 to January 3, 2018 in Guangzhou, this paper analyzed the influence of meteorological parameters variation on pollutant concentration and actinic radiation attenuation by aerosols, studied the formation mechanism of high aerosol and high ozone (double high) pollution, and explored the evolution of extinction coefficient profile in the vertical direction within the boundary layer on double high days. The actinic radiation attenuation on double high days is less than that on haze days during the study period. The scattering and absorption of aerosols has certain attenuation effect on actinic radiation. The scattering components of aerosols have positive feedback on actinic radiation, and the strong actinic radiation on double high days keeps O₃ and PM_2.5 concentration at a high level. Compared with non-double high days, double high days feature lower wind speed, higher temperature, stronger actinic radiation, higher PM_2.5, CO, SO₂, and NO₂ concentration, higher fine particle ratio, and higher near-surface depolarization ratio during 11:00-16:00. Radar observation shows that the high value area of extinction coefficient is below 0.5km at 8:00 am on four double high days. The mean value area of extinction coefficient appears in the low layer and keeps rising. Actinic radiation flux abates in the afternoon, and its mean value area no longer develops upwards. Extinction coefficient above the mean value area gradually increases vertically as particulate pollution aggravates, and it peaks near the top of the boundary layer. At night, extinction coefficient reduces with the rise of height at the low altitude, increases with the rise of height within a certain altitude range, and decreases exponentially above 1km. The high value area near the top of the boundary layer is more obvious at night.

Key words： double high days meteorological elements boundary layer vertical distribution lidar

Received: 15 July 2021

PACS:	X513
	X515

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	TAO Li-ping
	DENG Tao
	WU Dui
	WU Cheng
	HE Guo-wen
	ZHANG Xue
	SONG Lang
	OUYANG Shan-shan
	SUN Jia-yin
	LIANG Yue
	TAN Jian
	XIA Rui
	ZHOU Zhen

Cite this article:

TAO Li-ping,DENG Tao,WU Dui等. High aerosol and high ozone pollution and vertical distribution of extinction coefficients in Guangzhou during the dry season[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(2): 497-508.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I2/497

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