亚洲夏季风区域UTLS大气化学成分的时空分布，在全球气候变化与大气环境变迁中起着重要作用。UTLS大气成分变化的主要决定因素之一是低层大气污染物的向上输送。在夏季风系统控制下，地面排放大气污染物通过相应的动力输送过程，进入UTLS区域并对其大气化学系统及动力结构产生了影响。本项目将利用高精度的地面排放资料、最新的卫星遥感观测数据以及三维大气化学传输模式，研究亚洲夏季风区上对流层/下平流层（UTLS）大气化学成分的时空分布特征以及低层大气污染物向UTLS输送的过程。同时，结合观测数据和模式模拟，将进一步探讨伴随亚洲夏季风系统所发生的深对流快过程和大尺度慢过程在污染物输送过程中的不同作用，并尝试定量化分析不同区域、不同类型的地面排放源对UTLS大气成分的时空变化的贡献。

The temporal and spatial distribution and variation of atmospheric chemical components in UTLS in Asian Summer Monsoon region, play an important role determining the global climate and environmental change. One of the main factors controlling the atmospheric chemical components in UTLS is the influences by upward transport of atmospheric pollutants in lower atmosphere. Under the control of Asian Summer Monsoon system and through the dynamical transport processes, the surface emitted atmospheric pollutants enter upper world and may induce further impacts on the atmospheric chemical and dynamical systems in UTLS. In this proposal, by using the high-resolution surface emission data, the state-of-the-art satellite observations, and the 3-D atmospheric chemical transport model simulations, we will focus on the analysis of distribution and variation of atmospheric components in UTLS and upward transport of air pollutants from lower atmosphere. Also, by analyzing observation datasets and applying the model simulations, we will further investigate different effects induced by faster transport of deep convections and slower transport of large-scale processes which, both are corresponding to the Asian Summer Monsoon system. Moreover, we will conduct an effort of a quantitative exploration of the contribution of each individual surface emission regions and emission varieties to the changes of atmospheric components in UTLS.