Sensitivity analysis of the surface ozone and fine particulate matter to meteorological parameters in China

Shi, Zhihao; Huang, Lin; Li, Jingyi; Ying, Qi; Zhang, Hongliang; Hu, Jianlin

Meteorological conditions play important roles in the formation of ozone (inline-formulaO3) and fine particulate matter (inline-formulaPM2.5). China has been suffering from serious regional air pollution problems, characterized by high concentrations of surface inline-formulaO3 and inline-formulaPM2.5. In this study, the Community Multiscale Air Quality (CMAQ) model was used to quantify the sensitivity of surface inline-formulaO3 and inline-formulaPM2.5 to key meteorological parameters in different regions of China. Six meteorological parameters were perturbed to create different meteorological conditions, including temperature (inline-formulaT), wind speed (WS), absolute humidity (AH), planetary boundary layer height (PBLH), cloud liquid water content (CLW) and precipitation (PCP). Air quality simulations under the perturbed meteorological conditions were conducted in China in January and July of 2013. The changes in inline-formulaO3 and inline-formulaPM2.5 concentrations due to individual meteorological parameters were then quantified. inline-formulaT has a great influence on the daily maximum 8 h average inline-formulaO3 (inline-formulaO3-8 h) concentrations, which leads to inline-formulaO3-8 h increases by 1.7 in January in Chongqing and 1.1 ppb Kinline-formula−1 in July in Beijing. WS, AH, and PBLH have a smaller but notable influence on inline-formulaO3-8 h with maximum change rates of 0.3 ppb %inline-formula−1, inline-formula−0.15 ppb %inline-formula−1, and 0.14 ppb %inline-formula−1, respectively. inline-formulaT, WS, AH, and PBLH have important effects on inline-formulaPM2.5 formation of both in January and July. In general, inline-formulaPM2.5 sensitivities are negative to inline-formulaT, WS, and PBLH and positive to AH in most regions of China. The sensitivities in January are much larger than in July. inline-formulaPM2.5 sensitivity to inline-formulaT, WS, PBLH, and AH in January can be up to inline-formula−5inline-formulaµg minline-formula−3 Kinline-formula−1, inline-formula−3inline-formulaµg minline-formula−3 %inline-formula−1, inline-formula−1inline-formulaµg minline-formula−3 %inline-formula−1, and inline-formula+0.6inline-formulaµg minline-formula−3 %inline-formula−1, respectively, and in July it can be up to inline-formula−2inline-formulaµg minline-formula−3 Kinline-formula−1, inline-formula−0.4inline-formulaµg minline-formula−3 %inline-formula−1, inline-formula−0.14inline-formulaµg minline-formula−3 %inline-formula−1, and inline-formula+0.3inline-formulaµg minline-formula−3 %inline-formula−1, respectively. Other meteorological factors (CLW and PCP) have negligible effects on inline-formulaO3-8 h (less than 0.01 ppb %inline-formula−1) and inline-formulaPM2.5 (less than 0.01 inline-formulaµg minline-formula−3 %inline-formula−1). The results suggest that surface inline-formulaO3 and inline-formulaPM2.5 concentrations can change significantly due to changes in meteorological parameters, and it is necessary to consider these effects when developing emission control strategies in different regions of China.

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Shi, Zhihao / Huang, Lin / Li, Jingyi / et al: Sensitivity analysis of the surface ozone and fine particulate matter to meteorological parameters in China. 2020. Copernicus Publications.

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