基于风向线性变化假定的单Doppler雷达风场IVAP反演技术  

An Improved IVAP Single-Doppler Radar Wind Retrieval Technique on the Linearly Varying Assumption of Wind Direction

作　　者：王欣颖[1,2] 梁旭东[3] 

机构地区：[1]解放军理工大学,南京211101 [2]上海市气象局,上海200030 [3]中国气象局上海台风研究所,上海200030

出　　处：《暴雨灾害》2009年第1期71-74,91,共5页Torrential Rain and Disasters

摘　　要：IVAP和扩展VAP技术是在常用的VAD和VAP技术基础上发展起来的单Doppler雷达风场反演技术。在IVAP和扩展VAP技术基础上,进一步改进IVAP技术,将IVAP技术反演假定从局地均匀扩展到局地风速均匀、风向随方位角线性变化,进而提高IVAP技术的反演能力。使用涡旋流场试验表明,改进后的IVAP技术对于风速稳定,而风向变化的风场的反演能力有明显提高。由于改进后的IVAP技术保持了IVAP技术反演时可不对原始资料进行平滑预处理,对于小尺度扰动具有滤波作用,其应用更为广泛。Recently, two single-Doppler radar wind retrieval techniques of IVAP and an Extended-VAP method are developed respectively based on the VAD and VAP methods and the VAP method. Based on the two methods, the improvement of IVAP method is carried out in this paper. In the improved IVAP, wind speed is assumed being uniform locally and wind direction linearly varying with the scan azimuth, which is partly different from the IVAP method＇s assumption ＂locally uniform wind＂. Using this new assumption, the improved IVAP method have a better performance to retrieve the wind fields which have uniform wind speed and varying wind direction than the IVAP, as shown in retrieving the wind of a vortex case. Moreover, the improved IVAP is applied widely for keeping the IVAP advantages such as the smoothness preproeess being canceled in the retrieval of the base data, and the shortwave filter function for the small scale turbulence.

关 键 词：DOPPLER雷达 风场反演 IVAP技术 

分 类 号：P412.25[天文地球—大气科学及气象学]