Collaborative Research: Fundamental Investigation of Modeling for LES of Atmospheric Boundary Layer Flow Near the Land-Atmosphere Interface

本研究的主要目的是在小于大涡模拟（LES）中最小网格间距的空间尺度上研究大气边界层（ABL）中的空气运动和输送，并利用所获得的知识来改进大涡模拟（LES）的参数化。大涡模拟在提高我们对陆地-大气相互作用的认识方面发挥着越来越重要的作用。了解这种相互作用对气候和中尺度模式都很重要。这些研究将基于使用声波风速计阵列和目前正在开发的激光雷达测速仪的现场测量。将有两次实地活动。其中一场将在爱荷华州爱荷华市附近举行。它将包括一系列三维声波风速计和快速响应热膜传感器。场地主要由一片草地组成。数据将在六周的时间内收集。第二次野外活动将在加利福尼亚州戴维斯附近进行，为期一个月，将使用风力激光雷达和弹性激光雷达研究ABL的深度，声波风速计阵列和标准通量-能量平衡仪器。这个项目的主要成果将是LES将能够更真实地模拟大气边界层中的湍流。

The main objective of this research is to study air motion and transport in the Atmospheric Boundary Layer (ABL) at spatial scales smaller than the smallest spacing of the grids used in Large-eddy Simulations (LES), and to use the knowledge gained to improve parameterizations in LES. Large-eddy simulation is playing an increasingly important role in improving our understanding of land-atmosphere interaction at scales that are relevant in the ABL. Understanding of this interaction is important for both climate and mesoscale models. The studies will be based on field measurements using arrays of sonic anemometers and a lidar velocimeter currently being developed. There will be two field campaigns. One will take place near Iowa City, IA. It will include an array of three-dimensional sonic anemometers and fast-response hot-film sensors. The site consists primarily of a grass field. Data will be collected over a six-week period. The second field campaign will take place near Davis, CA over a one-month period and will use the wind lidar and elastic lidar to study the depth of the ABL, arrays of sonic anemometers and standard flux-energy balance instrumentation. The main result of this project will be that LES will be able to simulate turbulence in the atmospheric boundary layer more realistically.