成都一次霾过程中颗粒物消光作用的垂直变化

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Abstract Based on the intensive vertical observation of particle size spectrum and synchronous lidar observation during a heavy haze event in Chengdu over January 4~7, 2017, as well as the extinction coefficients calculated using the Mie scattering theory and compared with the lidar observation, the extinction coefficients of particle in sizes and the contributions to the total extinction were estimated. The results showed that during the heavy haze episode, the magnitudes of extinction coefficients of particles with different sizes in heights was ranked with PM₁ > PM_2.5~10 > PM_1~2.5 > PM _{> 10} within the boundary layer, and the PM₁ was the major factor dominating the particle extinction with the contribution of 49.50%~69.44%. In atmospheric boundary layer, extinction of all size particles presented the pronounced vertical and diurnal variations. In the daytime, the high extinction coefficients were located at the altitude below 600m and between 700 and 1100m. In the nighttime, the extinction coefficients vertically decreased more significantly with the high values around 1100m. Additionally, the extinction coefficients and the extinction contributions of PM_>1 below 200m in the nighttime were obviously greater than those in the daytime. In general, the extinction contribution rates of PM₁ increased with the decreasing contribution rates of PM_>1 in total particle extinction following vertical heights.

Key words： heavy haze particle size extinction coefficient contribution rate vertical change

Received: 12 October 2017

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	Articles by authors
	SUN Yong-liang
	ZHAO Tian-liang
	QIU Yu-jun
	LUO lei
	XIA Jun-rong
	CHEN Hong
	XIE Na

Cite this article:

SUN Yong-liang,ZHAO Tian-liang,QIU Yu-jun等. The vertical change in extinction effect of particles during a haze episode in Chengdu[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(5): 1629-1636.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I5/1629

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