单多普勒雷达风场反演的扩展VAP方法(Ⅰ):方法与对比试验

Extended-VAP Method for Retrieving Wind Field from Single-Doppler Radar.(Ⅰ): Methods and Contrast Exprement

利用构造的均匀和涡旋风场模拟了单多普勒雷达径向风资料,分析了VAP方法对不同类型风场的反演能力,发现VAP方法对均匀风场反演能力很强,而对涡旋风场反演效果较差,这主要与该方法局地均匀风假定有关。据此,针对不满足VAP方法假定条件的局地非均匀风场,提出了扩展VAP方法,并用模拟资料进行了对比试验,结果表明,扩展VAP方法能显著提高局地非均匀风场的反演能力,反演风场在风速大小和方向上都更趋于合理。通过实例反演以及与双多普勒雷达反演结果对比,进一步证实了扩展VAP方法的反演能力。

Single-Doppler radar radial velocity fields simulated by ideal uniform and vortex wind field are employed to analyze the capability of VAP moethod. Result shows that VAP mthod has stronger capability for retrieving local uniform wind field than that for vortex wind field, and the main reason is related to the assumption of local uniform wind. Hereby, the extended-VAP method is proposed and verified using simulated data for local variational wind fields that do not satisfy the supposition of VAP method. The resuits show that the extended-VAP method could obviously improve the retrieval result for local variational wind fields, and the retrieved wind fields are more reasonable both on direction and velocity. It has further proven the retrieval capability of extended-VAP method via the retrieval example and the comparason with the result of dual-Doppler analyses.