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

在人口密集的长江三角洲地区，近几十年来PM2.5浓度呈下降趋势，而臭氧（O3）污染呈恶化趋势，这两种相反的趋势可能是耦合的。然而，对其耦合形成机制的研究并不多见，其调控原理也不明确。在这项研究中，将分析和补充来自长江三角洲的空间分布观测数据，并进行深入的测量活动，详细研究气相和颗粒相污染物。这些观测数据将被深入分析，并用于数值模拟，以详细了解长三角地区臭氧和PM2.5的来源、形成途径和相互联系。基于观测和模拟结果，项目的总体目标是：(i)确定导致长三角地区臭氧和PM2.5污染的关键气象和化学条件，（ii）定量描述臭氧污染加剧与PM2.5下降之间的关系，以及（iii）制定综合缓解长三角地区臭氧和PM2.5的战略。

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.