气候变化领域集成服务门户(CCPortal): Modeling diurnal variation of surface PM2.5 concentrations over East China with WRF-Chem: Impacts from boundary-layer mixing and anthropogenic emission

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DOI	10.5194/acp-20-2839-2020
	Modeling diurnal variation of surface PM2.5 concentrations over East China with WRF-Chem: Impacts from boundary-layer mixing and anthropogenic emission
	Du Q.; Zhao C.; Zhang M.; Dong X.; Chen Y.; Liu Z.; Hu Z.; Zhang Q.; Li Y.; Yuan R.
发表日期	2020
ISSN	16807316
起始页码	2839
结束页码	2863
卷号	20 期号:5
英文摘要	Diurnal variation of surface PM2.5 concentration (diurnal PM2.5) could dramatically affect aerosol radiative and health impacts and can also well reflect the physical and chemical mechanisms of air pollution formation and evolution. So far, diurnal PM2.5 and its modeling capability over East China have not been investigated and therefore are examined in this study. Based on the observations, the normalized diurnal amplitude of surface PM2.5 concentrations averaged over East China is weakest (1:2) in winter and reaches 1:5 in other seasons. The diurnal PM2.5 shows the peak concentration during the night in spring and fall and during the daytime in summer. The simulated diurnal PM2.5 with WRF-Chem and its contributions from multiple physical and chemical processes are examined in the four seasons. The simulated diurnal PM2.5 with WRF-Chem is primarily controlled by planetary boundary layer (PBL) mixing and emission variations and is significantly overestimated against the observation during the night. This modeling bias is likely primarily due to the inefficient PBL mixing of primary PM2.5 during the night. The simulated diurnal PM2.5 is sensitive to the PBL schemes and vertical-layer configurations with WRF-Chem. Besides the PBL height, the PBL mixing coefficient is also found to be the critical factor determining the PBL mixing of pollutants in WRF-Chem. With reasonable PBL height, the increase in the lower limit of the PBL mixing coefficient during the night can significantly reduce the modeling biases in diurnal PM2.5 and also the mean concentrations, particularly in the major cities of East China. It can also reduce the modeling sensitivity to the PBL vertical-layer configurations. The diurnal variation and injection height of anthropogenic emissions also play roles in simulating diurnal PM2.5, but the impact is relatively smaller than that from the PBL mixing. This study underscores that more efforts are needed to improve the boundary mixing process of pollutants in models with observations of PBL structure and mixing fluxes in addition to PBL height, in order to simulate reasonably the diurnal PM2.5 over East China. The diurnal variation and injection height of anthropogenic emissions must also be included to simulate the diurnal PM2.5 over East China. © 2020 Author(s).
关键词	aerosol anthropogenic effect boundary layer concentration (composition)diurnal variation mixing modeling particulate matter China
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132183
推荐引用方式 GB/T 7714	Du Q.,Zhao C.,Zhang M.,et al. Modeling diurnal variation of surface PM2.5 concentrations over East China with WRF-Chem: Impacts from boundary-layer mixing and anthropogenic emission[J]. Atmospheric Chemistry and Physics,2020,20(5).
APA	Du Q..,Zhao C..,Zhang M..,Dong X..,Chen Y..,...&Yuan R..(2020).Modeling diurnal variation of surface PM2.5 concentrations over East China with WRF-Chem: Impacts from boundary-layer mixing and anthropogenic emission.,20(5).
MLA	Du Q.,et al."Modeling diurnal variation of surface PM2.5 concentrations over East China with WRF-Chem: Impacts from boundary-layer mixing and anthropogenic emission".20.5(2020).