Journal Article

Simulated Sensitivity of Ozone Generation to Precursors in Beijing during a High O3 Episode

Zhao, Shuman, Cui, Meng, Xing, Li, Long, Xin, An, Xingqin, Tang, Guiqian, Li, Guohui, He, Jianjun

2021

Overview

This study uses the WRF-Chem model combined with the empirical kinetic modeling method (EKMA curve) to study the compound pollution event in Beijing that happened in 13–23 May 2017. Sensitivity tests are conducted to analyze ozone sensitivity to its precursors, and to develop emission reduction measures. The results suggest that the model can accurately simulate the compound pollution process of photochemistry and haze. When VOCs and NO x were reduced by the same proportion, the effect of O 3 reduction at peak time was more obvious, and the effect during daytime was more significant than at night. The degree of change in ozone was peak time > daytime average. When reducing or increasing the ratio of precursors by 25% at the same time, the effect of reducing 25% VOCs on the average ozone concentration reduction was most significant. The degree of change in ozone decreased with increasing altitude, the location of the ozone maximum change shifted westward, and its range narrowed. As the altitude increases, the VOCs-limited zone decreases, VOCs sensitivity decreases, NO x sensitivity increases. The controlled area changed from near-surface VOCs-limited to high-altitude NO x -limited. Upon examining the EKMA curve, we have found that suburban and urban are sensitive to VOCs. The sensitivity tests indicate that when VOCs in suburban are reduced about 60%, the O 3 -1h concentration could reach the standard, and when VOCs of the urban decreased by about 50%, the O 3 -1h concentration could reach the standard. Thus, these findings could provide references for the control of compound air pollution in Beijing.

• Publisher: Science Press,Springer Nature B.V,PLA Troops No.78127,Chengdu 610000,China%Institute of Atmospheric Composition,Chinese Academy of Meteorological Sciences,Beijing 100081,China%School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China%Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710061,China%Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China%School of Environment Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China
• Subject: Air pollution / Altitude / Atmospheric Oxidation Capacity / Atmospheric Sciences / Control / Daytime / Earth and Environmental Science / Earth Sciences / Emission analysis / Emission measurements / Emissions control / Empirical analysis / Formation Mechanisms / Geophysics/Geodesy / Haze / High altitude / Meteorology / Nitrogen compounds / Original Paper / Oxides / Ozone / Ozone concentration / Photochemistry / PM2.5 Pollution: Quantification Methods / Precursors / Sensitivity analysis / Simulation / VOCs / Volatile organic compounds