Airborne Wind Lidar Measurements of Vertical and Horizontal Winds for the Investigation of Orographically Induced Gravity Waves
Airborne Wind Lidar Measurements of Vertical and Horizontal Winds for the Investigation of Orographically Induced Gravity Waves
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DOI：
10.1175/jtech-d-17-0021.1
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发表时间：
2017-06
影响因子：
2.2
通讯作者：
B. Witschas;S. Rahm;A. Dörnbrack;J. Wagner;M. Rapp
中科院分区：
文献类型：
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作者：
B. Witschas;S. Rahm;A. Dörnbrack;J. Wagner;M. Rapp
AbstractAirborne相干多普勒测风激光雷达测量，在重力波生命周期（GW-LCYCLE）I现场活动期间获得的，从2013年12月2日至14日在瑞典的基律纳，被用来调查内部重力波（GW）引起的流动在斯堪的纳维亚山脉。垂直风速是由激光雷达测量得出的，平均偏差小于0.05 m s−1，标准偏差为0.2 m s−1，通过ECMWF风数据校正水平风投影到视线方向。水平风速和风向的激光雷达测量检索通过应用速度-方位角显示扫描和频谱积累技术，导致约9公里的水平分辨率沿着飞行轨迹和垂直分辨率为100米，分别。垂直和水平风测量对于表征GW属性是有价值的，这通过2013年12月13日在天气条件有利于GW的情况下进行的飞行来证明。
AbstractAirborne coherent Doppler wind lidar measurements, acquired during the Gravity Wave Life-Cycle (GW-LCYCLE) I field campaign performed from 2 to 14 December 2013 in Kiruna, Sweden, are used to investigate internal gravity waves (GWs) induced by flow across the Scandinavian Mountains. Vertical wind speed is derived from lidar measurements with a mean bias of less than 0.05 m s−1 and a standard deviation of 0.2 m s−1 by correcting horizontal wind projections onto the line-of-sight direction by means of ECMWF wind data. The horizontal wind speed and direction are retrieved from lidar measurements by applying a velocity–azimuth display scan and a spectral accumulation technique, leading to a horizontal resolution of about 9 km along the flight track and a vertical resolution of 100 m, respectively. Both vertical and horizontal wind measurements are valuable for characterizing GW properties as demonstrated by means of a flight performed on 13 December 2013 acquired during weather conditions favorable fo...