Effects of Mesoscale Forcing in a Shear Flow with Critical Levels

9224595林内重力波是深对流风暴及其周围普遍存在的现象。然而，它们对当地天气状况的影响仍未得到充分调查。在这项研究中，首席研究人员将利用理论研究和数值模式来提高对具有临界水平的切变流动中的中尺度热力或机械强迫动力学的科学理解。为了实现这一目标，将解决以下具体问题：具有临界水平的剪切流对热强迫的瞬时和非线性响应是什么？波-流相互作用如何影响结构大气中密度流的形成？具有切变层和临界层的结构大气的导管机制和非线性效应是什么？在具有急流基本气流的结构大气中，波被困的条件是什么，强迫存在于临界层附近或以上？在有热力强迫的切变流动中，湿效应和旋转效应是什么？*

9224595 Lin Internal gravity waves are ubiquitous phenomenon in and around deep convective storms. Their influence on local weather conditions, however, has still not been fully investigated. In this study, the Principal Investigator will use theoretical studies and numerical model to improve scientific understanding of the dynamics of mesoscale thermal or mechanical forcing in shear flows with critical levels. To accomplish this objective the following specific questions will be addressed: What are the transient and nonlinear responses of a shear flow with a critical level to thermal forcing? How does the wave-outflow interaction affect the formation of a density current in a structured atmosphere? What is the ducting mechanism and the nonlinear effects of a structured atmosphere with a shear layer and critical level? What is the condition for wave trapping in a structured atmosphere with jet-like basic flow and forcing existing in the vicinity or above the critical level? What are the moist and rotational effects in a shear flow with thermal forcing? ***