Effect of Wind Shear Entrainment and Moist Convection in the Atmospheric Mixed Layer Derived from a Large Eddy Simulation Model

[9217028 Sorbjan] pi建议使用嵌套网格的大涡模拟模式来开发新的和改进现有的大气混合层动力和热效应的参数化。首先，将进行以下四种对流边界层的理想模拟：(1)非穿透性和无剪切，(2)穿透性和无剪切，(3)非穿透性有剪切，(4)穿透性有剪切。在此基础上，非穿透性和无穿透性剪切机制的比较将用于研究CBL顶部的夹带过程。此外，将进行无剪切和剪切状态的研究，以开发剪切CBL的参数化。此外，他们还将研究湿润对流与积云-湿积云类型的云对混合层动力学的影响。最后，他们将通过与凤凰号和风暴试验期间的观测结果进行比较，尝试测试剪切CBL状态的参数化。所建立的参数化方法有望应用于数值天气预报和气候模拟模式。＊＊＊

9217028 Sorbjan The PIs propose to use large eddy simulation model with a nested grid to develop new and improve existing parameterizations of dynamic and thermal effects in the atmospheric mixed layer. Initially, idealized simulations of the following four regimes of the convective boundary layer will be performed: (1) non- penetrative and shearless, (2) penetrative and shearless, (3) non- penetrative with shear, and (4) penetrative with shear. From these, a comparison of non-penetrative and penetrative shearless regimes will be used to investigate entrainment processes on the top of the CBL. In addition, a study of the shearless and sheared regimes will be performed to develop a parameterization the sheared CBL. Furthermore, they will also investigate effects of moist convection with cumulus-humilis type of clouds on dynamics of the mixed layer. Finally, they will attempt to test parameterizations of the sheared CBL regimes through comparison with observations taken during the Phoenix and the Stormfest experiments. The developed parameterizations are hoped to be used in numerical weather prediction and climate simulation models. ***