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The Stable Nocturnal Boundary Layer: Observations and Interpretation of Mesoscale Instability Processes and Small-Scale Turbulent Breakup in the Absence/Presence of a Nocturnal Jet

稳定的夜间边界层：在夜间急流不存在/存在的情况下中尺度不稳定过程和小规模湍流破裂的观测和解释

基本信息

批准号：
9907289
负责人：
Ben Balsley
金额：
$ 27.12万
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 2002-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9907289&HistoricalAwards=false
关键词：
Stable Nocturnal Boundary Layer Observations

项目摘要

As part of the CASES-99 program (Cooperative Atmosphere-Surface Exchange Study-1999), the PI will measure the temperature, pressure, humidity, and wind velocity with high resolution in time and altitude using instruments suspended from a tethered kite or, in calm conditions, a tethered blimp. The purpose of CASES is to study the physics and dynamics of the very stable nocturnal boundary using an array of surface-based instruments, remote sensing observations, a 60-m instrumented tower, and two instrumented airplanes. Observations by the kite/blimp system will provide vertical profiles up to about 2 km, supplementing the aircraft measurements and filling the important altitude gap between the top of the tower and the minimum aircraft altitude. It will also provide time series of temperature and wind velocity at selected altitudes to permit the observation of transient events such as intermittent bursts of turbulence, strong gusts, and wave motions. Phenomena of special interest are low-level jets, wave instabilities, and the turbulent mixing of air across the nocturnal inversion. These measurements, in combination with simultaneous observations by the instrumented tower, the aircraft, and the remote sensing equipment (radars, lidars, wind profilers) will constitute an excellent set of data for studying the dynamics of the stable boundary layer throughout its entire vertical extent.

作为CASES-99计划（1999年大气-地面交换合作研究）的一部分，PI将使用悬挂在系留风筝上的仪器或在平静条件下悬挂在系留飞艇上的仪器，在时间和高度上以高分辨率测量温度、压力、湿度和风速。 CASES的目的是使用一系列地面仪器、遥感观测、60米仪表塔和两架仪表飞机研究非常稳定的夜间边界的物理和动力学。风筝/飞艇系统的观测将提供最高达约2公里的垂直剖面，补充飞机的测量，填补塔顶与飞机最低高度之间的重要高度差距。它还将提供选定高度的温度和风速的时间序列，以便观测瞬时事件，如湍流的间歇爆发、强阵风和波动。特别感兴趣的现象是低空急流，波的不稳定性，和湍流混合的空气在夜间逆温。这些测量，与仪器塔，飞机和遥感设备（雷达，激光雷达，风廓线仪）的同时观测相结合，将构成一个很好的数据集，用于研究整个垂直范围内的稳定边界层的动态。