Coupling and mitigation of atmospheric ozone and PM in the Chinese Yangtze River Delta (PMO3-YRD)

在人口密集的中国长江三角洲地区，PM2.5的浓度在过去的几十年里下降，而臭氧（O3）污染恶化，这两个相反的趋势可能是相互耦合的。然而，这种耦合的形成机制还不多见，其调控原理也不明确。在这项研究中，将分析YRD的空间分布观测数据，并通过深入的测量活动进行补充，详细研究气相和颗粒相污染物。我们会深入分析观测所得的数据，并利用这些数据进行数值模拟，以详细研究长江三角洲地区臭氧和PM2.5的来源、形成途径和相互关系。根据观测和模拟结果，项目的整体目标是：（i）确定导致长江三角洲臭氧和PM2.5污染的主要气象和化学条件，（ii）定量描述O3污染增强与PM2.5下降之间的关系;（iii）制定长三角地区O3和PM2.5联合减排策略。

In the densely populated Chinese Yangtze River Delta (YRD) region, the concentration of PM2.5 has declined over the past decades, while the ozone (O3) pollution has deteriorated and these two opposite trends might be coupled to each other. However, the coupled formation mechanisms have not often been studied yet, and their regulation principles are not specific. In this study, spatially distributed observational data from the YRD will be will be analysed and complemented by an intensive measurement campaign studying gas- and particle phase pollutants in great detail. The observational data will be deeply analysed and used for numerical modelling to allow for detailed insides into sources, formation pathways and interlinkages of O3 and PM2.5 in the YRD region.Based on both the observational and modelling results, the overall project goals are (i) to determine the key meteorological and chemical conditions leading to O3 and PM2.5 pollution over the YRD, (ii) to quantitatively describe the relationship between enhancement of O3 pollution and decline of PM2.5, and (iii) to develop strategies for a combined mitigation of O3 and PM2.5 in the YRD region.