珠海市不同前体物削减比例对臭氧的影响

Impact of Different Precursors Reduction Ratio on Ozone in Zhuhai

基于2014年10月的气象场与排放源数据,使用三维空气质量模型,通过设置40种不同的区域NOx与VOCs减排情景,模拟了不同减排情景下珠海不同点位的臭氧浓度变化。总体而言,珠海市不同点位的臭氧与区域前体物减排的关系存在一定差别,表明珠海臭氧污染是区域性问题,但不同点位的臭氧对前体物排放的敏感性存在差别,东面的站点需要更大的削减量才能达到与西部站点相同的臭氧浓度下降率。VOCs∶NOx削减比率越大,珠海市臭氧浓度越容易下降。因此,要控制珠海的臭氧污染,应加大对珠三角区域VOCs的控制。

Based on the data of meteorological field and emission sources in October 2014,the ozone concentration changes at different sites in Zhuhai were simulated using a three-dimensional air quality model with 40 different regional NOx and VOCs emission reduction scenarios.Generally,the relationship between ozone and regional precursor emission reduction at different locations in Zhuhai was various,indicating that ozone pollution in Zhuhai was a regional problem,but the sensitivity of ozone to precursor emission at different locations was different.The eastern sites needed more precursors reductions to achieve the same ozone reduction rate than the Western sites.The greater the VOCs∶NOx reduction rate,the easier the ozone concentration in Zhuhai would drop.If the reduction ratio of VOCs∶NOx was 4∶1,only 5%reduction of NOx and 20%reduction of VOCs emissions were needed to reduce the ozone concentration by 10%.If the reduction ratio of VOCs∶NOx was 2∶1,the ozone concentration could be reduced by 10%only by decreasing the emission of NOx by about 15%and VOCs by 30%.Therefore,to control ozone pollution in Zhuhai,the control of VOCs in the Pearl River Delta should be strengthened.