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CASES-99项目（1999年合作大气表面交换研究）的一部分，PI将与康涅狄格大学的David Miller博士合作，使用热膜风速计来测量最小的可分解湍流漩涡对垂直热流和动量的贡献。在稳定的夜间条件下（这是case项目的重点），地面附近的湍流漩涡非常小，以至于用传统的观测手段（如声波风速计）无法探测到。除了评估先前未观测到的小涡流的重要性外，研究人员还将研究辐射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开发的Monin-Obukov相似理论在稳定边界层中的应用程度。湍流间歇性现象也将被研究，使用来自仪器塔台、激光雷达、雷达风廓线仪和飞机的数据。