Collaborative Research: Vertical Divergence of Turbulent and Radiative Fluxes and Influence of Mesoscale Motions on Turbulence Intermittency

作为CASE-99计划(合作大气-地面交换研究-1999)的一部分，PI将与科罗拉多大学的孙杰伦博士合作，使用热膜风速计来测量最小的可分辨湍流涡旋对垂直热量和动量通量的贡献。在稳定的夜间条件下，这是CASES计划的重点，地面附近的湍流涡旋如此之小，以至于无法用传统的观测手段，如声波风速计检测到。除了评估以前未观测到的小涡旋的重要性外，研究人员还将研究辐射热通量和感热通量在边界层能量平衡中的相对重要性，并确定为对流边界层发展的Monin-Obukov相似理论在稳定边界层中的应用程度。还将使用仪表塔、激光雷达、雷达风廓线仪和飞机的数据来研究湍流间歇现象。

As part of the CASES-99 program (Cooperative Atmosphere-Surface Exchange Study-1999), the PI, in collaboration with Dr. Jielun Sun of the University of Colorado, will employ hot film anemometers to measure the contribution of the smallest resolvable turbulent eddies to the vertical fluxes of heat and momentum. In stable, nocturnal conditions which are the focus of the CASES program, turbulent eddies near the ground are so small as to be undetectable by traditional observing means, such as sonic anemometers. In addition to evaluating the importance of the small and previously unobserved eddies, the investigators will study the relative importance of radiative and sensible heat fluxes in the energy balance of the boundary layer and determine the extent to which the Monin-Obukov similarity theory, developed for convective boundary layers, may have application in the stable boundary layer. The phenomenon of turbulence intermittency will also be studied, using data from an instrumented tower, lidars, radar wind profilers, and aircraft.