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

大涡模拟模型推导的大气混合层中风切变夹带和湿对流的影响

• 批准号: 9217028
• 负责人: Zbigniew Sorbjan
• 金额: $ 28.25万
• 依托单位: University of Oklahoma Norman Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-11-15 至 1997-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9217028&HistoricalAwards=false
• 关键词: Effect; Wind; Shear; Entrainment; Moist

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. ***

小行星9217028 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力效应的参数化。 首先，将对对流边界层的以下四种状态进行理想化模拟：（1）非穿透和无剪切，（2）穿透和无剪切，（3）非穿透和有剪切，（4）穿透和有剪切. 从这些，非渗透和渗透无剪切制度的比较将被用来调查夹带过程的顶部的CBL。 此外，研究的无剪切和剪切制度将进行开发参数化的剪切CBL。 此外，他们还将研究湿对流与积云-微云类型的云对混合层动力学的影响。 最后，他们将尝试通过与凤凰和Stormfest实验期间的观测结果进行比较来测试剪切CBL制度的参数化。 所发展的参数化模式可望用于数值天气预报和气候模拟模式。 ***