A New Method for Deriving High-Vertical-Resolution Wind Vector Data from the L-Band Radar Sounding System in China  

作　　者：Fang YUAN Zijiang ZHOU Jie LIAO 

机构地区：[1]National Meteorological Information Center,China Meteorological Administration,Beijing 100081,China

出　　处：《Advances in Atmospheric Sciences》2024年第11期2192-2202,共11页大气科学进展（英文版）

基　　金：funded by an NSFC Major Project (Grant No. 42090033);the China Meteorological Administration Youth Innovation Team “High-Value Climate Change Data Product Development and Application Services”(Grant No. CMA2023QN08);the National Meteorological Information Centre Surplus Funds Program (Grant NMICJY202310)。

摘　　要：High-vertical-resolution radiosonde wind data are highly valuable for describing the dynamics of the meso-and microscale atmosphere. However, the current algorithm used in China's L-band radar sounding system for calculating highvertical-resolution wind vectors excessively smooths the data, resulting in significant underestimation of the calculated kinetic energy of gravity waves compared to similar products from other countries, which greatly limits the effective utilization of the data. To address this issue, this study proposes a novel method to calculate high-vertical-resolution wind vectors that utilizes the elevation angle, azimuth angle, and slant range from L-band radar. In order to obtain wind data with a stable quality, a two-step automatic quality control procedure, including the RMSE-F(root-mean-square error F) test and elemental consistency test are first applied to the slant range data, to eliminate continuous erroneous data caused by unstable signals or radar malfunctions. Then, a wind calculation scheme based on a sliding second-order polynomial fitting is utilized to derive the high-vertical-resolution radiosonde wind vectors. The evaluation results demonstrate that the wind data obtained through the proposed method show a high level of consistency with the high-resolution wind data observed using the Vaisala Global Positioning System and the data observed by the new Beidou Navigation Sounding System. The calculation of the kinetic energy of gravity waves in the recalculated wind data also reaches a level comparable to the Vaisala observations.

关 键 词：L-band radar sounding system upper air high-vertical-resolution radiosonde wind vectors quality control polynomial fitting 

分 类 号：P412.25[天文地球—大气科学及气象学]