Numerical simulation of ozone dry deposition characteristics in autumn over the Pearl River Delta region, China
GENG Yi-chao1, TIAN Chun-yan1, CHEN Xiao-yang1, SHEN Chong1, WANG Xue-mei2, CHANG Ming2, WANG Ming-jie3, CHEN Xun-lai3, FAN Qi1
1. School of Atmospheric Sciences, Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou 510275, China;
2. Institute for Environmental and Climate Research, Jinan University, Guangzhou 510632, China;
3. Shenzhen National Climate Observatory, Shenzhen 518040, China
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 NOx 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 (Ra), sublayer resistance(Rb) and canopy resistance(Rc). Our results show that the dry deposition velocity at night was mainly affected by Ra, while in the daytime Rc played a major role. These three resistances were mainly influenced by the stability、the friction velocity and the landuse type of the underlying surface.
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