强旋转气流中近地面风速的估算
Estimation of Near Surface Wind Speeds in Strongly Rotating Flows
摘要：
模拟研究一致表明，龙卷风漩涡中最猛烈的风发生在地面以上几十米的最低处。由于视线的考虑，这些速度是雷达平台无法观察到的。在这项工作中，开发了一种方法，利用参数切向速度模型来自多普勒雷达测量，together与切向动量和质量连续性约束，估计的径向和垂直速度在一个稳定的轴对称框架。主要结果是，高空观测的信息可以外推到涡旋的表层。利用伪数据进行了数值试验，结果表明了信息量信息量对反演的影响。
英文摘要：
Modeling studies consistently demonstrate that the most violent winds in tornadic vortices occur in the lowest tens of meters above the surface. These velocities are unobservable by radar platforms due to line of sight consider- ations. In this work, a methodology is developed which utilizes parametric tangential velocity models derived from Doppler radar measurements, to- gether with a tangential momentum and mass continuity constraint, to esti- mate the radial and vertical velocities in a steady axisymmetric frame. The main result is that information from observations aloft can be extrapolated into the surface layer of the vortex. The impact of the amount of information available to the retrieval is demonstrated through some numerical tests with pseudo-data.
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