登陆台风的多普勒雷达资料质量控制和水平风场反演
RETRIEVAL OF HORIZONTAL WIND AND QUALITY CONTROLLING OF SINGLE DOPPLER RADAR DATA ON LANDING TYPHOON
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摘要: 消除噪音和速度模糊、进行水平风场的反演并检验是正确使用和充分利用多普勒雷达探测资料的前提。对2005年8月山东烟台多普勒雷达探测到的0509号台风"麦莎"的存在速度模糊的径向速度资料首先进行噪音和速度模糊消除处理,检验结果表明对资料的退模糊处理是成功的;其次进行了水平风场的反演,并对反演的风场从雷达径向速度的特征、大尺度环境风场特征、与卫星云图云带的对比和以台风中心为圆心计算的径向风垂直剖面特征等方面进行检验。结果表明,利用单多普勒雷达探测资料得到的水平风场能够清晰地给出登陆热带气旋内部存在的中小尺度系统,及其水平和垂直结构,并表明与台风外围雨带强降水区域相对应的是明显的中尺度水平风场的切变与辐合区。反演风场也可以为进一步利用单多普勒雷达探测资料分析和研究登陆台风内部的中尺度结构提供高分辨率的可靠的分析资料。同时证明,使用的退速度模糊方法能够有效地应用于较完整资料的速度模糊的自动消除,以及VAP方法对于中小尺度风场分析的实用性。Abstract: The preconditions to make best use of the Doppler radar data includes the noise removing,velocity ambiguity distinguishing,horizontal wind field retrieving and exactness verifying.The noise removing and velocity ambiguity distinguishing was made in this work for the Doppler radar data collected during August 2005 on landing typhoon Matasa(0509) in Yantai city,Shangdong Province,and the verified result showed that the quality control for this dataset was correct.After the horizontal wind field was retrieved,the synoptic analysis were done,including the characteristics of the radar radial velocity,the characteristics of the large-scale wind field,compartment with the satellite images and the vertical cross of the velocity.The analysis results show that the meso/small-scales systems in the landing typhoon and its horizontal/vertical structure could be clearly retrieved using the dataset collected by single Doppler radar,and a shear or a convergence was corresponding with the sever storm band around the tropical cyclone.At the same time,the retrieved wind field from single Doppler radar was proved to be a reliable and high-resolution dataset to analysis the inner meso-scale structure of the landing typhoon.It was also proved that the method for removing the velocity alias could be an effective approach to the preliminary quality control of the Doppler radar data,and the VAP method could also be a reasonable solution for analysis of meso-scale wind field.
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Key words:
- Doppler radar /
- horizontal wind /
- retrieval /
- velocity alias /
- landing typhoon
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