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《Journal of Arid Meteorology》 2017-04
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Preliminary Study on Retrieval Experiments of Low-level Horizontal Wind Field for Two Heavy Rainfall Cases Based on Two Radar Networks

ZHANG Yong;ZHANG Yaping;MU Rong;YANG Chun;HE Yue;Chongqing Meteorological Observatory;  
Considering the operational applications,the constraint term associated with reflectivity factor in objective function of the two-step variational method based on two radar networks was omitted. For the sake of verifying the capacity and stability of the simplified two-step variational method to retrieve the wind field,the sensibility experiments by changing constraint conditions such as horizontal resolution,vertical layers,vertical resolution,retrieval area and retrieval center were designed,and which were applied to the retrieval of horizontal wind field on 3 km height for two heavy rainfall processes occurring from 18 to 19 June 2010 and 3 to 5 July 2010 in Chongqing. The results show that the simplified two-step variational method to retrieve the low-level horizontal wind field under different constraint conditions during two rainstorm processes was more reliable and stable. The retrieved horizontal wind field could reveal the characteristics of flow field structure for the meso-β scale system during the heavy rainfall processes,and the configurations of the strong echo zone with the meso-β scale in low level and the convergence zone of retrieved wind field were better.
【Fund】: 公益性行业(气象)科研专项(GYHY201206028)资助
【CateGory Index】: P412.25
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