TOMEX: Mesospheric and lower thermospheric diffusivities and instability layers
TOMEX: Mesospheric and lower thermospheric diffusivities and instability layers
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TOMEX：中层和低热层扩散率和不稳定层
DOI：
10.1029/2002jd003079
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发表时间：
2004
影响因子：
--
通讯作者：
C. Gardner
中科院分区：
文献类型：
--
作者：
R. Bishop;M. Larsen;J. Hecht;A. Liu;C. Gardner
[1] 湍流氧气混合实验 (TOMEX) 于 2000 年 10 月 26 日在新墨西哥州白沙导弹靶场进行，其中包括火箭载三甲基铝 (TMA) 化学示踪剂实验。随后的 TMA 轨迹提供了有关大约 85 至 140 公里高度之间的水平中性风、湍流和大气扩散特性的详细信息。使用位于新墨西哥州星火光学靶场的伊利诺伊大学风/温度激光雷达进行的测量提供了 85 至 105 公里高度之间稳定性特性的详细时间历史，包括化学示踪剂测量之前和期间的高分辨率风和温度测量。根据尾迹扩展率估计的扩散率的值与 110 公里高度以上分子扩散的预期值一致，并且大于以下大多数高度处分子扩散的值。在103公里以下，发现了动力和对流不稳定区域，并且扩散率受到不稳定性的强烈控制。不稳定区域混合良好，但在某些情况下，中间区域的涡流能量耗散率非常小。近乎瞬时的测量结果还表明，涡流扩散在 103 公里（标称涡轮暂停高度）和 110 公里之间的高度范围内仍然很重要。
[1] The Turbulent Oxygen Mixing Experiment (TOMEX), which was carried out at White Sands Missile Range in New Mexico on 26 October 2000, included a rocketborne trimethyl aluminum (TMA) chemical tracer experiment. The subsequent TMA trails provided detailed information about the horizontal neutral wind, turbulence, and diffusivity properties of the atmosphere between approximately 85 and 140 km altitude. Measurements with the University of Illinois Na wind/temperature lidar located at the Starfire Optical Range, NM, provided a detailed time history of the stability properties between 85 and 105-km altitude, including high-resolution wind and temperature measurements prior to and during the chemical tracer measurements. The diffusivities estimated from the trail expansion rates have values consistent with the values expected for molecular diffusion above 110-km altitude and values that are larger than those for molecular diffusion at most altitudes below. Below 103 km, both regions of dynamic and convective instability were found, and the diffusivities are strongly controlled by the instabilities. The unstable regions are well mixed, but the intermediate regions, in some cases, have very small eddy energy dissipation rates. The nearly instantaneous measurements also suggest that eddy diffusion is still important in the height range between 103 km, the nominal turbopause height, and 110 km.