摘要
利用2019年4-9月高时空分辨率的长沙机场阵列天气雷达资料开展三维变分(three-dimensional variational data assimilation,3DVAR)风场反演研究。为验证该算法的反演效果,选取外场试验中10次降水过程,在阵列天气雷达的三维精细探测区内,采用阵列天气雷达合成风场和1部L波段边界层风廓线雷达产品作为参考值对阵列反演风场进行验证评估。结果表明:在稳定性降水条件下,阵列反演风场与阵列合成风场、风廓线雷达产品的结果较为一致;在对流性降水条件下,由于不均匀性会造成风廓线测风精度下降,风廓线雷达产品与阵列反演风场和阵列合成风场差异较大。阵列反演风场与阵列合成风场在稳定性、对流性降水条件下水平风速相对偏差分别低于19%,29%,水平风向差分别低于14.92°,26.35°,稳定性降水条件下阵列反演风场更优,误差在可接受范围内。两种算法得到的风场结构符合各类天气系统的基本特征,水平风场空间分布和风速、风向非常接近。
Synthesizing or retrieving the radial velocity of weather radar can obtain a three-dimensional wind field,which is an important research direction in radar meteorology.A fine three-dimensional wind field helps to study the structure and motion characteristics of small-scale and meso-scale weather systems.Array weather radar(AWR)consists of three-phased array transmit-receive subarrays(referred as transceiver subarrays),which is used for synchronous detection.AWR data are of high temporal and spatial resolution,thus ensuring the correctness of wind field synthesis and retrieval.According to domestic and aboard research,three-dimensional variational data assimilation(3 DVAR)wind field retrieval algorithm is quite mature.Using AWR data of 10 rainfall cases at Changsha airport from April to September in 2019,the wind field is retrieved and evaluated.In the three-dimensional fine detection area of the AWR,detection data of a L-band boundary layer wind profile radar and the AWR synthetic wind field are used as reference value to evaluate the retrieved wind field.Results show that the retrieved wind field,the synthetic wind field,and wind profile radar product are more consistent and reasonable in stable precipitation process.In addition,the result error is larger in convective precipitation.The unevenness of the environmental wind field in convective precipitation can reduce the accuracy of wind measurement,and therefore it is not enough to explain the rationality of the AWR retrieved wind field.The wind profile radar is quite different from the AWR retrieved and the synthetic wind field.For different precipitation types,the wind field structure retrieved by AWR and the wind field obtained by AWR synthetic wind field are consistent with the basic characteristics of various weather systems.The spatial distribution and size direction of the horizontal wind field of two algorithms are very close.Error results show that the relative deviation of horizontal wind speed in the stable and convective precipitation is less than 19%and 29%,and the difference of horizontal wind direction is lower than14.92°and 26.35°,respectively.The error is within the acceptable range.Compared with the AWR synthetic wind field,the retrieved wind field result during stable precipitation process is better than that during convective precipitation process.
作者
李渝
马舒庆
杨玲
甄小琼
乔丹
Li Yu;Ma Shuqing;Yang Ling;Zhen Xiaoqiong;Qiao Dan(College of Electronic Eng ineering,Chengdu University of In format ion Technology,Chengdu 610225;CMA Key Laboratory of Atmos pheric Sounding,Chengdu 610225;Meteorological Observation Center of CMA,Beijing 100081;Institute of Atmospheric Physics,China Academy of Sciences,Beijing 100029;Ra yshon Technology Co.Ltd.,Beijing 100089)
出处
《应用气象学报》
CSCD
北大核心
2020年第6期681-693,共13页
Journal of Applied Meteorological Science
基金
国家自然科学基金国家重大科研仪器研制(部委推荐)项目(31727901)。
关键词
阵列天气雷达
3DVAR
反演风场
合成风场
验证评估
array weather radar(AWR)
3DVAR
retrieved wind field
synthetic wind field
verification and evaluation
