边界层方案对南京地区PM<sub>2.5</sub>浓度模拟的影响

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Abstract Based on the WRF-Chem (Weather Research and Forecasting Chemistry Model) air quality model, this paper used four boundary layer schemes including YSU (Yonsei University), MYJ (Mellor Yamada Janjic), MYNN2 (Mellor Yamada Nakanishi Niino Level 2), and ACM2 (Asymmetric Convective Model2), and two ACM2-based modified schemes ACM2R2 (the turbulence diffusion coefficient threshold of the lowest 6 layers was set to 2m²/s) and ACM2R5 (the turbulence diffusion coefficient threshold of the lowest 10 layers was set to 5m²/s), the effects of different boundary layer schemes on PM_2.5 concentration simulation in Nanjing were analyzed. The results showed that the surface meteorological elements and wind/temperature/humidity profiles simulated by the six schemes presented reasonable diurnal variation characteristics and height variation, and the difference of meteorological elements among different boundary layer schemes was small. However, the four boundary layer schemes YSU, MYJ, MYNN2, and ACM2 overestimated PM_2.5 concentration at night, while ACM2R2 and ACM2R5 significantly reduced the PM_2.5 concentration, even sometimes to a level of underestimation. In terms of the deviation of the whole period, ACM2R2 was closest to the observed value. This was due to the higher turbulent diffusion coefficient of ACM2R2 at night, which was more conducive to the upward diffusion of pollutants from the surface, and made the surface PM_2.5 concentration of ACM2R2 scheme lower than that of the original ACM2 scheme at night, thus amended the overestimation of the original ACM2 scheme. These results show that the difference in turbulent diffusion coefficient is an important reason for the difference in PM_2.5 concentration simulation, and it is necessary to accurately parameterize the turbulent diffusion coefficient in the boundary layer scheme at night to improve the accuracy of the PM_2.5 concentration simulation.

Key words： numerical simulation boundary layer parameterization scheme WRF-Chem PM_2.5 Nanjing

Received: 05 November 2020

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	WANG An-ting
	LI Yu-bin
	ZHAO Chun
	DU Qiu-yan
	WANG Xiao-dong
	GAO Zhi-qiu

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WANG An-ting,LI Yu-bin,ZHAO Chun等. Influence of different boundary layer schemes on PM_2.5 concentration simulation in Nanjing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(7): 2977-2992.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I7/2977

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