摘要
文中研究了笛卡尔坐标系下双多普勒天气雷达三维风场反演技术 ,提出了包括雷达原始资料的预处理 ,空间插值以及可靠性检验的新方法 ,提高了反演结果的可信度和精确度。使用模拟的双多普勒雷达体扫资料进行了反演试验 ,结果表明 :本文的方法能够比较真实地反映风场的三维结构 ,可以用于真实风场的反演。
A new technique of deriving three dimensional wind fields is investigated from the Dual-Doppler weather radar radial wind which is based on the Cartesian space using variational method. It provides a simultaneous resolution of three wind components and satisfies both the minimal dual-equation system and the continuity equation . The most advantage of this method is that can remove the potential drawback of an iterative solution of Cartesian dual-Doppler analysis techniques(It is a major demerit that retrieves the vertical velocity using mass continuity equation with iterative method). The data pre-process technology and interpolation are also studied. We developed a three dimensional Cressman weighting function to process the interpolation. In order to test the capability and advantage of this method, one numerical experiment based on simulate radar observations is designed. Firstly, we synthesize the dual-Doppler radar radial velocity and reflectivity from the numerical model. Then, the three dimensional wind components are retrieved from the radial velocity and reflectivity using this new technique. The retrieved three-dimensional wind fields are found to be quite consisted with those previously simulate winds fields. Mean difference, Root-mean-square error and relative deviation are defined to test the precise of the new method. These statistic errors reveal the accuracy and the advantage of this method. The numerical experiment definitely testifies that this new technique can be used to retrieve the three-dimensional wind fields from the radial velocity and reflectivity detected by the real Dual-Doppler weather radar.
出处
《气象学报》
CSCD
北大核心
2002年第5期585-593,共9页
Acta Meteorologica Sinica
基金
国家重大基础研究"我国重大天气灾害形成机理与预测理论研究"项目 (G19980 40 90 9)。
关键词
笛卡儿坐标系
双多普勒天气雷达
三维风场
反定
插值
变分
Dual-Doppler weather radar, Three-dimensional wind fields, Retrieval, Interpolation, Variational method.
