Radar and aircraft observations of a layer of strong refractivity turbulence
Radar and aircraft observations of a layer of strong refractivity turbulence
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雷达和飞机观测强折射湍流层
DOI：
10.1117/12.323944
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发表时间：
1998
影响因子：
3.8
通讯作者：
Timothy L. Berkopec
中科院分区：
文献类型：
--
作者：
F. Eaton;G. Nastrom;B. Masson;Ila L. Hahn;Kimberley A. McCrae;S. Nowlin;Timothy L. Berkopec
1997年1月23日，克特兰空军基地的空军研究实验室利用新墨西哥州白色沙滩导弹靶场大气剖面仪研究设施的49.25 MHz雷达和装有仪表的C-135 E飞机获得的观测资料，研究了强持续湍流层内折射率结构参数（C2 n）的特性。飞机测量感测大气温度结构参数（C2 T）与细导线aerodynamic探头导出C2 n，而雷达测量提供C2 n从布拉格散射在湍流尺度在晴朗的空气。飞机的结果提供了在特定飞行高度的水平空间信息，而雷达获得的值显示了时间剖面信息。飞行腿长约200公里，沿沿着在8个不同的高度从11.01公里至12.21公里MSL。湍流层和飞行方向是从起飞前VHF雷达获得的C2 n和风测量中选择的。演示内容包括从飞机测量结果中获得的活动性湍流模式的距离-高度显示，以及从与飞机结果相对应的雷达观测结果中得出的距离-高度显示。这两种距离高度显示都是通过假设泰勒假设并将实际风廓线应用于时间高度数据而产生的。讨论了特征的演化和持续性。比较两种不同的方法检测C2 n的统计评估。飞机传感器和雷达的显着特点进行了讨论。
The Air Force Research Laboratory at Kirtland Air Force Base examined the characteristics of the refractive index structure parameter (C2n) within a strong and persistent layer of turbulence using observations obtained from a 49.25 MHz radar and an instrumented C-135E aircraft at the Atmospheric Profiler Research Facility at White Sands Missile Range, NM on January 23, 1997. The aircraft measurements sensed the atmospheric temperature structure parameter (C2T) with fine-wire aerothermal probes for deriving C2n while the radar measurements provided C2n from Bragg scatter at turbulent scales in the clear air. The aircraft results provide horizontal spatial information at the specific altitudes flown while the radar-obtained values show temporal profile information. Flight legs approximately 200 km long were flown along the wind direction at eight different altitudes from 11.01 km to 12.21 km MSL. The turbulent layer and direction of flights were selected from the VHF radar-obtained C2n and wind measurements prior to take-off. Presentations include a range-height display of the patterns of refractivity turbulence obtained from the aircraft measurements and a range-height display derived from the radar observations corresponding to the aircraft results. Both range-height displays were produced by assuming Taylor's hypothesis and applying the actual wind profile to the time-height data. The evolution and persistency of features is discussed. A statistical evaluation comparing the two different methods of sensing C2n is presented. Salient features of the aircraft sensors and radar are discussed.