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首页> 外文期刊>Atmosphere >Profiling Radar Observations and Numerical Simulations of a Downslope Wind Storm and Rotor on the Lee of the Medicine Bow Mountains in Wyoming
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Profiling Radar Observations and Numerical Simulations of a Downslope Wind Storm and Rotor on the Lee of the Medicine Bow Mountains in Wyoming

机译：怀俄明州药弓山李下坡暴风雨和转子的仿形雷达观测和数值模拟

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This study describes a downslope wind storm event observed over the Medicine Bow range (Wyoming, USA) on 11 January 2013. The University of Wyoming King Air (UWKA) made four along-wind passes over a five-hour period over the mountain of interest. These passes were recognized as among the most turbulent ones encountered in many years by crew members. The MacCready turbulence meter aboard the UWKA measured moderate to severe turbulence conditions on each pass in the lee of the mountain range, with eddy dissipation rate values over 0.5 m 2/3 s ?1 . Three rawinsondes were released from an upstream location at different times. This event is simulated using the non-hydrostatic Weather Research and Forecast (WRF) model at an inner- domain resolution of 1 km. The model produces a downslope wind storm, notwithstanding some discrepancies between model and rawinsonde data in terms of upstream atmospheric conditions. Airborne Wyoming Cloud Radar (WCR) vertical-plane Doppler velocity data from two beams, one pointing to the nadir and one pointing slant forward, are synthesized to obtain a two-dimensional velocity field in the vertical plane below flight level. This synthesis reveals the fine-scale details of an orographic wave breaking event, including strong, persistent downslope acceleration, a strong leeside updraft (up to 10 m·s ?1 ) flanked by counter-rotating vortices, and deep turbulence, extending well above flight level. The analysis of WCR-derived cross-mountain flow in 19 winter storms over the same mountain reveals that cross-mountain flow acceleration and downslope wind formation are difficult to predict from upstream wind and stability profiles.
机译：这项研究描述了2013年1月11日在美国医学之弓范围内观测到的下坡暴风雨事件。怀俄明国王航空大学（UWKA）在五个小时的时间内在目标山上进行了四次顺风通过。这些通行证是机组人员多年来遇到的最动荡的通行证。 UWKA上的MacCready湍流计在山脉背风的每个通道上测量了中度到重度湍流条件，涡流消散率值超过0.5 m 2/3 s？1。在不同的时间从上游位置放出了三个拉因探空仪。使用非静水天气研究和预报（WRF）模型以1 km的内域分辨率模拟此事件。尽管在上游大气条件方面模型与原始信箱数据之间存在一些差异，但该模型仍会产生下坡风暴。合成了来自两束光束的机载怀俄明云雷达（WCR）垂直平面多普勒速度数据，其中一束指向天底，另一束指向前方，在飞行高度以下的垂直平面上获得二维速度场。该合成揭示了地形波破碎事件的精细尺度细节，包括强而持久的下坡加速度，强烈的背风上升气流（高达10 m·s？1），反向旋转的涡流以及深处的湍流，延伸至飞行水平。对同一座山上19场冬季暴风雨中WCR的横断面山流的分析表明，很难从上游的风和稳定性剖面来预测横断面山流的加速度和下坡风的形成。

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