珠江三角洲秋季臭氧干沉降特征的数值模拟

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Abstract

The regional chemical transport model WRF-Chem was used to simulate the spatial and temporal characteristics of O₃ dry deposition flux in the Pearl River Delta (PRD) region in October 2014. The results show obvious spatial and temporal differences of ozone dry deposition flux: the mean flux in the daytime [0.68μg/(m²·s)] was higher than that in the night time [0.21μg/(m²·s)]; the O₃ deposition flux and its diurnal variation in the urban areas are smaller than those in the sub-urban areas. Moreover, the O₃ concentrations had obvious daily single-peak distribution characteristics which influenced by the precursors such as NO_x and VOCs, as well as the meteorological conditions. The peaks generally occur during 14:00~15:00, and the high concentrations were mainly located in the Guangfo junction、Jiangmen city and east Zhongshan city. The dry deposition velocity of O₃ also present significant spatial and temporal variations. It increased rapidly from 0.27cm/s during 07:00~08:00 to a relatively stable value 0.60cm/s during 10:00~16:00; and then decreased slowly to 0.21cm/s from 17:00 to midnight. The dry deposition velocity was mainly affected by three types of resistances: the aerodynamic resistance (R_a), sublayer resistance(R_b) and canopy resistance(R_c). Our results show that the dry deposition velocity at night was mainly affected by R_a, while in the daytime R_c played a major role. These three resistances were mainly influenced by the stability、the friction velocity and the landuse type of the underlying surface.

Key words： Pearl River Delta WRF-Chem model ozone dry deposition dry deposition velocity resistances

Received: 14 September 2018

PACS:

X513

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	Articles by authors
	GENG Yi-chao
	TIAN Chun-yan
	CHEN Xiao-yang
	SHEN Chong
	WANG Xue-mei
	CHANG Ming
	WANG Ming-jie
	CHEN Xun-lai
	FAN Qi

Cite this article:

GENG Yi-chao,TIAN Chun-yan,CHEN Xiao-yang等. Numerical simulation of ozone dry deposition characteristics in autumn over the Pearl River Delta region, China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(4): 1345-1354.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I4/1345

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