| 摘要: |
| 通过对一次欧洲冷锋过程单多普勒雷达立体扫描资料的实例计算来考察用VAD(Velocity Azimuth Display)方法反演锋面在垂直剖面图上的风场和用VAP(Velocity Azimuth Processing)方法反演水平风场的可能性。反演结果不仅展示了锋面两侧的风向切变,而且也展示出气团内部风场中存在的中尺度结构。由于VAP方法对距离圈上多普勒速度随方位的变化非常敏感(多普勒速度的脉动、观测误差以及多普勒速度场中的不连续点都会影响反演的结果),因此有必要发展多普勒观测资料的预处理方法,以改进风场反演的效果。 |
| 关键词: 多普勒雷达 风场反演 冷锋 |
| DOI： |
| 分类号: |
| 基金项目:科学基金4935060(4935062)项目 |
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| A TEST OF WIND FIELD RETRIEVAL FROM SINGLE DOPPLER OBSERVATION FOR A COLD FRONT CASE |
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Tao Zuyu
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National Laboratory for Severe Storm Research Department of Geophysics, Peking University, Beijing, 100871
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| Abstract: |
| In this paper the single Doppler radar cubic measurments of a cold front in Europe are used to examine the possibility to retrieve the wind vectors on the vertical cross section by the VAD (Velocity Azimuth Display) method and the winds on the horizontal plane by the VAP (Velocity Azimuth Processing) method. The results show that the wind vector fields can be retrieved from the single Doppler velocity fields. The retrieved wind fields display not only the wind shear associated with the front, but also the mesoscale structures in the air mass.The analysis of the retrieved wind fields shows that the fluctuations, the observational errors and the discontinuous points of the Doppler measurments will considerably influence the results of retrieval due to the fact that the VAP method is sensitive to the variation of velocity with azimuth. In order to improve the wind field retrieval, the pre-processing technique for the Doppler radar measurments must be developed. |
| Key words: Doppler radar Wind field retrieval Cold front |
