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

9217028 Sorbjan，PI建议使用带有嵌套网格的大涡模拟模式，以开发新的和改进现有的大气混合层动力和热力效应的参数化。首先，将对以下四种对流边界层进行理想化模拟：(1)非穿透无切变，(2)穿透无切变，(3)非穿透切变，(4)穿透切变。在此基础上，对非穿透性和穿透性无剪切区域进行了比较，以研究CBL顶部的卷吸过程。此外，还将对无切变和切变状态进行研究，以开发切变CBL的参数化。此外，他们还将研究湿对流和积云类型对混合层动力学的影响。最后，他们将尝试通过与凤凰号和Stormfest实验期间的观测进行比较，来测试切变的CBL区域的参数化。所开发的参数化方案有望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. ***