Simulations of Observed Lee Waves and Rotor Turbulence
Simulations of Observed Lee Waves and Rotor Turbulence
复制标题
观测到的李波和转子湍流的模拟
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
H. Ólafsson
中科院分区：
文献类型：
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作者：
H. Ágústsson;H. Ólafsson
摘要2008年11月18日，一架商用飞机在沿冰岛东南海岸沿着的西风气流中飞行时遇到了严重的湍流，并从2500米处下降到地面以安全着陆。数值模拟在水平分辨率为9，3和1公里进行了比较，现有的观测。模拟再现的情况下，观察到严重的下坡风暴在地面以及相关的放大背风波和转子高空，而气候数据表明，所有观察到的西风风暴在该地区是相同的类型，并发生在一个类似的结构大气。强剪切湍流被模拟在背风波和转子的界面处，以及转子内部。背风波和湍流模式是不稳定的，随着上游垂直风切变的增加，背风波变得不那么陡峭，但湍流暂时增加，而转子环流打破。从预测的角度来看，这一事件C...
AbstractOn 18 November 2008 a commercial aircraft encountered severe turbulence while flying in westerly flow along the southeastern coast of Iceland and descending from 2500 m down to the ground for a safe landing. Numerical simulations at horizontal resolutions of 9, 3, and 1 km are compared to the available observations. The simulations reproduce the situation, with an observed severe downslope windstorm at the ground as well as associated amplified lee waves and a rotor aloft, while climate data indicate that all observed westerly windstorms in the region are of the same type and occur in a similarly structured atmosphere. Strong shear turbulence is simulated at the interface of the lee wave and the rotor, as well as inside the rotor. The lee waves and the turbulence patterns are not stationary and as the upstream vertical wind shear increases, the lee wave becomes less steep, but the turbulence increases temporarily while the rotor circulation breaks down. From a forecasting perspective, this event c...