亚洲地区Rossby波破碎对平流层-对流层交换的影响

亚洲地区的副热带高空急流，其强度之大和季节变化之明显，是全球之最。与高空急流变化相对应的对流顶附近Rossby波破碎（RWB）事件，可以引起强烈的对流层-平流层交换（STE），气团沿对流层顶附近的等熵面准水平的经向输送，即完成快速的STE，这与以往研究较多的锋面输送带大尺度输送和对流垂直输送显著不同。但是，针对亚洲地区RWB的STE研究很少，对其认识尚不清楚。本项目拟利用多种大气成分的卫星观测资料，配合多种气象分析资料，研究RWB过程中大气成分的演变与动力、热力过程；利用中尺度数值模式WRF，轨迹模式HYSPLIT4等，估算亚洲RWB过程的STE物质量，诊断其输送路径及时间尺度等。本研究有助于更全面地认识亚洲地区STE过程及其特征。

Both the strength and the variation of the Asian subtropical high level jet(HLJ) is dominant in the world. Rossby wave breaking (RWB) near the tropopause associated with the sudden changes of the HLJ can cause an intense stratosphere-troposphere exchange (STE). Air near the tropopause flows along the meridianal isentropic surfaces and the STE is accomplished quickly. This type of STE differs from that caused by deep convection and front conveyor belt. However, study of the STE induced by the RWB in Asia was seldom carried out before. Therefore, a variety of satellite remote sensing data and reanalysis meteorological data, trajectory model HYSPLIT4 and mesoscale numerical prediction model WRF will be employed to study the dynamical process and the troposphere -stratosphere mass exchange (e.g. ozone and water vapor) during the RWB in Asia. The transport path and time scale of the STE will also be concerned.