边界层方案对华北一次污染过程模拟的影响

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Abstract

The WRF model and the CAMx model were applied to simulate the meteorology variables and air pollutants over Beijing-Tianjin-Hebei (BTH) region during an air pollution episode in November 2015. The impacts of three planetary boundary layer (PBL) schemes (YSU, MYJ, ACM2) on meteorological factors and air pollutants simulations were compared. The observed surface meteorological factors and PM_2.5 over BTH region and the wind profile data at Beijing were used to evaluate the model performances. The MYJ scheme predicted the largest biases on the 10m wind speed and lowest biases on the 2m temperature and humidity. The ACM2scheme had the best performance on the simulation of vertical profile in the PBL. All the three PBL schemes overpredicted the wind speed in the PBL and the bias could reach to 2.6m/s. The model PBL heights were recalculated using a uniform method, which based on the vertical diffusivities. The MYJ scheme produced the lowest PBL heights and the highest PM_2.5 concentrations, among the three schemes. The overestimated 10m wind speed of the MYJ scheme leaded to a lower simulated PM_2.5 concentration over BTH region, but it would increase the PM_2.5 concentration in the downwind area. The ACM2scheme produced the better vertical profile and higher Kv than others in the lower layers in the night, then the ACM2scheme produced a better performance on the simulated PM_2.5 concentrations and other air pollutants in the night than the other two schemes.

Key words： PBL schemes air quality model pollutants simulation vertical diffusion BTH region

Received: 04 June 2018

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X511

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	Articles by authors
	WANG Ji-kang
	ZHANG Bi-hui
	ZHANG Heng-de
	LV Meng-yao

Cite this article:

WANG Ji-kang,ZHANG Bi-hui,ZHANG Heng-de等. The impacts of planetary boundary layer schemes on pollutants simulations during an air pollution episode over BTH region[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(1): 61-71.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I1/61

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