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首页> 外文期刊>Annales Geophysicae >Comparisons between high-resolution profiles of squared refractive index gradient iM/isup2/sup measured by the Middle and Upper Atmosphere Radar and unmanned aerial vehicles (UAVs) during the Shigaraki UAV-Radar Experiment 2015 campaign
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Comparisons between high-resolution profiles of squared refractive index gradient iM/isup2/sup measured by the Middle and Upper Atmosphere Radar and unmanned aerial vehicles (UAVs) during the Shigaraki UAV-Radar Experiment 2015 campaign

机译：在2015年Shigaraki UAV-Radar实验期间，由中高层大气雷达和无人飞行器（UAV）测量的高分辨率折射率平方梯度梯度 M 2 的比较运动

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摘要

New comparisons between the square of the generalized potential refractive index gradient iM/isup2/sup, estimated from the very high-frequency (VHF) Middle and Upper Atmosphere (MU) Radar, located at Shigaraki, Japan, and unmanned aerial vehicle (UAV) measurements are presented. These comparisons were performed at unprecedented temporal and range resolutions (1a??4a?ˉmin and a??a??a??a?ˉ20a?ˉm, respectively) in the altitude range a??a??a??a?ˉ1.27a??4.5a?ˉkm from simultaneous and nearly collocated measurements made during the ShUREX (Shigaraki UAV-Radar Experiment) 2015 campaign. Seven consecutive UAV flights made during daytime on 7??June??2015 were used for this purpose. The MU Radar was operated in range imaging mode for improving the range resolution at vertical incidence (typically a few tens of meters). The proportionality of the radar echo power to iM/isup2/sup is reported for the first time at such high time and range resolutions for stratified conditions for which Fresnel scatter or a reflection mechanism is expected. In more complex features obtained for a range of turbulent layers generated by shear instabilities or associated with convective cloud cells, iM/isup2/sup estimated from UAV data does not reproduce observed radar echo power profiles. Proposed interpretations of this discrepancy are presented.
机译：根据位于中部的甚高频（VHF）中高层大气（MU）雷达估算的广义潜在折射率梯度 M 2 的平方之间的新比较介绍了日本的Shigaraki和无人飞行器（UAV）测量。这些比较是以空前的时间和距离分辨率（分别为1a ?? 4a？min和a ?? a ?? a ?? a？a？20a ?? m）在海拔范围a ?? a ?? a ?? a？a？中进行的。在2015年ShUREX（Shigaraki无人机雷达实验）活动中同时进行且几乎并列的测量中，1.27a？4.5a？km。为此，在2015年6月7日的白天连续进行了7次无人机飞行。 MU雷达以距离成像模式操作，以提高垂直入射（通常为几十米）时的距离分辨率。在如此高的时间和距离分辨率下，首次报告了雷达回波功率与 M 2 的比例，用于分层条件下的预期菲涅尔散射或反射机制。在由剪切不稳定性产生的或与对流云细胞相关的一系列湍流层获得的更复杂特征中，根据UAV数据估算的 M 2 无法重现观测到的雷达回波功率剖面。提出了对此差异的建议解释。

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