Effects of Mesoscale Forcing in a Shear Flow with Critical Levels

[9224595] Lin内部重力波是深对流风暴内部和周围普遍存在的现象。然而，它们对当地天气状况的影响尚未得到充分调查。在这项研究中，首席研究员将使用理论研究和数值模型来提高对临界水平切变流中尺度热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态和非线性响应是什么？波-流出相互作用如何影响结构大气中密度流的形成？具有切变层和临界水平的结构大气的传导机制和非线性效应是什么？在具有喷射状基本流和在临界水平附近或以上存在强迫的结构大气中，波捕获的条件是什么？在有热强迫的切变流中，潮湿和旋转的影响是什么？＊＊＊

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? ***