Retrieving 3D Wind Field By Using Data Of Single Doppler Radar And Analyzing Mesoscale Rainstorm

In order to analyze the course of mesoscale rainstorm, the paper discusses that the rainstorm which happened on Shangchen and Huoshan on 23 June 2002 is mesoscale analyzed by using data of single Doppler weather radar. In the first part of paper, we introduce the appliance of Doppler weather radar in meteorological work in the near future, and simply enumerate all kinds of adjoint methods to retrieve data of radar. In the second part of paper, we choice some methods that are usually used domestically and overseas, compare excellence and flaw of the methods by using data of simulate wind field, analyze synthetically the precision of simulate result, the length of retrieval time and the structure of data distributing, lastly decide to regard ameliorated quasi-4D adjoint method as retrieval technology in the paper. In the third part of paper, we retrieve the data of single Doppler weather radar in Hefei, Anhui province, then calculate 3D wind field, streamline field, divergence, vorticity, helicity, moisture flux, divergence of moisture flux and potential vorticity from the result of retrieval. The result indicates that, in the course of the rainstorm in Huoshan, there are obvious low-level jet of great intensity, infection of mesoscale shear line, enhancement of plus vorticity which increases intensity of convergence, improves ascending velocity and brings on precipitation, and quick enhancement of helicity which provides the basis to forecast, in addition, convergence of moisture flux and analyzed potential vorticity which reflects baroclinic convective instability sufficiently indicate the characteristics of the rainstorm.