基于三维空气质量模型的广东省臭氧生成速率分析

使用WRF/CAMx模型及化学过程分析(CPA)模块,系统研究了广东省夏、秋季的臭氧生成敏感性与生成速率。夏季,广州与东莞等珠三角中部地区臭氧生成主要对VOCs敏感,郊区的臭氧生成速率较大,珠江口地区是重要的臭氧生成源区,夏季白天(08:00-17:00)平均净臭氧生成速率可达37μg/(m^3·h),位于珠三角东北部的天湖白天平均净臭氧生成速率约为25μg/(m^3·h)。秋季,珠江口西岸臭氧生成主要对VOCs敏感,秋季臭氧生成速率显著低于夏季。夏、秋季珠三角大部分地区臭氧生成敏感性从早上对VOCs敏感逐步过渡到下午对NO_x敏感,广东其他大部分地区则全天均为NOx敏感,一般在VOCs敏感区中的臭氧生成速率与化学消耗速率均较大。中心城区的臭氧生成弱,臭氧净化学消耗强。

Analysis of Ozone Formation Rate in Guangdong Based on Three-Dimensional Air Quality Model

Using WRF/CAMx model and chemical process analysis (CPA) module,the sensitivity and formation rate of ozone in summer and autumn of Guangdong Province were systematically studied. In summer,the central part of the Pearl River Delta (PRD),such as Guangzhou and Dongguan,ozone generation was sensitive to VOCs. The ozone generation rate in suburbs was relatively high,and the Pearl River Estuary was an important source of ozone generation,where the average net ozone generation rate during day time (08: 00-17: 00) in summer could reach 37 μg/ (m^3·h). At day time,the average net ozone formation rate of Tianhu in the northeastern part of the PRD was about 25 μg/ (m^3·h). In autumn,the western areas of the Pearl River Estuary were VOCs sensitive for ozone generation. The ozone generation rate in autumn was significantly lower than that in summer. In summer and autumn,most areas in the PRD were VOCs sensitive in the morning and would gradually transit to NOx sensitive in the afternoon,while most other areas in Guangdong were NOx sensitive all day long. Ozone formation and chemical consumption rate was generally higher in regions of VOCs sensitive. Ozone production in urban areas was weak,and rate of chemical consumption of ozone was fast.