Page 211 - 《高原气象》2025年第3期

3 期 韩颂雨等：基于最优插值方法分析的雷达反演三维风场与再分析风场融合试验 769

Analysis of the Combined Three-dimensional Wind Field Retrieved

by Radar and Reanalysis Wind Field based on Optimum
Interpolation Technique

1， 3
2
1
1
HAN Songyu ， WANG Liji ， KANG Lili ， LIU Yongsheng ，
1
TENG Zhou ， ZHOU Lingli ， CHEN Yefeng 1， 2
4
（1. Zhejiang Meteorological Information Network Center， Hangzhou 310000， Zhejiang， China；
2. Zhejiang Institute of Meteorological Sciences， Hangzhou 310000， Zhejiang， China；
3. Zhejiang Meteorological Safety Technology Center， Hangzhou 310000， Zhejiang， China；
4. Zhejiang Pronvince Meteorological Observatory， Hangzhou 310000， Zhejiang， China）
Abstract： In order to construct a grid spatiotemporal continuous three-dimensional wind products integrating
wind retrieved by radar， combining ERA5 reanalysis wind field which used as the first-guess field and three-di‐
mensional wind field retrieved by dual-radar networking which used as the observed field based on optimal inter‐
polation technique. The error statistics of the ERA5 reanalysis and radar retrieved wind fields are defined based
on the data of six precipitation processes in the Zhejiang region and the error structures were employed to com‐
pute the weights， the combined hourly three-dimensional wind field with 0. 25°×0. 25° resolution were obtained
as the final results which checked and evaluated with the second radio-sounding wind data. The results show
that： Compared with the ERA5 wind field， the accuracy of the combined wind field is improved， root mean
square error is reduced by 6% （U component）， 16% （V component）； the correlation coefficient is increased by
0. 02 （V component）. The combined wind field has effectively corrected the rather smaller wind field shown by
the reanalysis data near the eye of typhoon Lekima， filled the blind area of radar retrieval wind field， and formed
a complete and accurate wind field product， corrected the large deviation of the typhoon location with ERA5
wind field. Combined with the small-scale wind information retrieved by radar， the combined wind field reflects
the original inconspicuous convergence characteristics of ERA5 wind field， and improves the application value
of data.
Key words： three-dimensional wind； optimum interpolation； Dual-Doppler radar retrieval； reanalysis wind
field； ERA5