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

合作研究：湍流和辐射通量的垂直发散以及中尺度运动对湍流间歇性的影响

• 批准号: 9906637
• 负责人: Jielun Sun
• 金额: $ 11.53万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-08-01 至 2003-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9906637&HistoricalAwards=false
• 关键词: Collaborative; Research; Vertical; Divergence; Turbulent

As part of the CASES-99 program (Cooperative Atmosphere-Surface Exchange Study-1999), the PI, in collaboration with Dr. David Miller of the University of Connecticut, 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.

作为Case-99计划的一部分（1999年的合作气氛 - 表面交换研究），PI与康涅狄格大学的David Miller博士合作，将使用热膜动态计，以衡量最小的可分辨湍流eddies对热量和垂直速度的最小湍流eddies的贡献。在案例计划的稳定，夜间条件下，地面附近的湍流涡流非常小，以至于无法通过传统观察手段（例如声波动脉仪）无法检测到。除了评估小型和以前未观察到的涡流的重要性外，研究人员还将研究边界层能量平衡中辐射和明智的热通量的相对重要性，并确定Monin-Obukov相似性理论在对流边界层开发的多大程度可能在稳定的边界层中应用。还将使用仪器塔，激光雷达，雷达风扇形器和飞机的数据来研究湍流间歇性现象。