火山喷发是上对流层及下平流层大气中硫酸盐气溶胶的主要自然源，对全球气候具有重要影响。近年来持续的中小型火山喷发使平流层气溶胶水平持续增加。此项研究针对发生在2002年至2018年二氧化硫排放量较大、对平流层气溶胶水平产生显著影响的火山喷发个例，首先利用拉格朗日粒子扩散模式MPTRAC和AIRS二氧化硫探测数据反演得到高精度的火山二氧化硫排放时空分布，继而利用MPTRAC模式模拟火山二氧化硫及后续产生的硫酸盐气溶胶的传输路径和混合过程，探究火山喷发造成的硫酸盐气溶胶进入平流层进而影响全球气候的关键途径；结合MPTRAC模式和MIPAS、OSIRIS、CALIOP卫星气溶胶观测数据，定量研究火山硫酸盐气溶胶对平流层气溶胶的贡献；以火山气溶胶为示踪物，探究不同环流背景下气溶胶进入平流层的关键机制，其中东亚季风区的传输与交换过程以及火山喷发气溶胶对亚洲平流层气溶胶特征的影响将被着重研究。

Sulfate aerosols produced by volcanic eruptions are a major source of sulfate aerosols in the upper troposphere and lower stratosphere and have a significant impact on the global climate. The continuous small and medium-sized volcanic eruptions in recent years have increased the stratospheric aerosol levels. This study is based on the moderate volcanic eruptions between 2002 and 2018 which have a significant impact on the stratospheric aerosols. First, the sulfur dioxide emission inventory of these volcanic eruptions is retrieved using the Lagrangian particle dispersion model MPTRAC and AIRS sulfur dioxide observations, which will provide the high-precision spatiotemporal distribution of volcanic sulfur dioxide emissions. Then the MPTRAC model is used to simulate the transport pathways and mixing process of volcanic sulfur dioxide and subsequently converted sulfate aerosols. The aim of the study is to explore the main pathway for the volcanic sulfate aerosols entering the stratosphere under different meteorological backgrounds, to quantify the contribution of volcanic sulfate aerosol to stratospheric aerosol using MPTRAC model, and using volcanic aerosol as tracer to explore the role of the Asian summer monsoon in the transport and mixing of aerosols in the upper troposphere and lower stratosphere region. Model simulations will be compared with and validated by satellite aerosol observations of MIPAS, OSIRIS, CALIOP. The characteristics of the aerosol layer in the Asian monsoon region in response to the volcanic eruptions and the transport pathway associated with the Asian summer monsoon will also be investigated.