本项目拟通过对卫星观测资料和再分析数据的统计分析，结合数值模式模拟结果，研究热带对流层季节内振荡活动(MJO)对中高层大气活动的影响。对于平流层的研究，拟关注MJO事件与平流层极涡活动的相互作用及其物理、化学机制。通过分析MJO对行星波、重力波等的扰动，尝试理解背景大气变化（如是否发生了平流层突然增温，SSW）对MJO于平流层极涡耦合过程的影响。在MJO对中间层大气影响的研究中，拟利用美国国家大气科学研究中心定制动力版本（SD）WACCM、CAMCHEM模式，通过耦合低层大气再分析数据，从而在模式的低层大气模拟中得到与观测一致的MJO信号，并模拟其与中间层环流、潮汐等大气活动的影响。综合分析模式模拟并对比卫星观测数据，研究MJO信号在中高层大气中的传播过程及其对大气环流/潮汐等变化的影响。尝试理解对流层季节内活动对行星波、重力波的激发、传播过程的调制以及其与中层大气环流的相互耦合作用。

Using the satellite observations and reanalysis data, as well as the numerical simulation, this study will investigate the effect of the tropical tropospheric intra-seasonal oscillation (e.g. Madden-Julian Oscillation) on the variations of the middle atmosphere (stratosphere and mesosphere). For the stratosphere, this study will focus on the MJO-stratospheric polar vortex interaction, along with its physical and chemical mechanism. This object attempts to explore the effect of the atmospheric background on the MJO-stratosphere interactions, by analyzing the MJO-induced wave disturbances. The ‘Specified Dynamical’ WACCM and CAMCHEM model of National Center for Atmospheric Research will be utilized to simulate the impact of MJO on the stratosphere and the mesosphere. By nudging to the lower atmospheric reanalysis data, the MJO characteristics and the responses to it in the troposphere and stratosphere in WACCM/CAMCHEM follow those in the reanalysis meteorological fields. By analyzing both the numerical simulations and the satellite observations, the propagation of MJO signal and its effect on the middle atmospheric circulation/tides and atmospheric composition will be studied. We also attempt to understand the mechanism in which the MJO could modulate the wave (Planetary waves and gravity waves) incitation and propagation in the stratosphere and mesosphere, and how these waves interact with the middle atmosphere.