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| 变分方法反演双多普勒雷达低层二维风场 | |
| 引用本文： | 黄思训,曹小群,闵锦忠.变分方法反演双多普勒雷达低层二维风场[J].南京气象学院学报,2008,31(4):453-459. |
| 作者姓名： | 黄思训 曹小群 闵锦忠 |
| 作者单位： | 1. 中国人民解放军理工大学,气象学院,江苏,南京,211101 2. 中国人民解放军理工大学,气象学院,江苏,南京,211101;国防科技大学,湖南,长沙,410073 3. 南京信息工程大学,江苏省气象灾害重点实验室,江苏,南京,210044 |
| 基金项目： | 国家自然科学基金，江苏省气象灾害重点实验室基金 |
| 摘 要： | 提出用变分方法和正则化方法相结合反演双多普勒雷达资料的低层二维风场的方法，即在目标泛函中加入正则化项（先验信息项）且合理选择正则化参数。数值试验结果表明：正则化项的引入能有效滤除反演风场中因奇点和观测资料引起的误差，提高反演精度，得到最优的全局反演风场。 |
| 关 键 词： | 双多普勒雷达反演 变分方法 正则化方法 二维风场 |
Retrieval of Dual-Doppler Radar's 2-D Lower Level Wind Field Using a Variational Method |
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| HUANG Si-xun,CAO Xiao-qun,MIN Jin-zhong.Retrieval of Dual-Doppler Radar''s 2-D Lower Level Wind Field Using a Variational Method[J].Journal of Nanjing Institute of Meteorology,2008,31(4):453-459. | |
| Authors: | HUANG Si-xun CAO Xiao-qun MIN Jin-zhong |
| Institution: | HUANG Si-xun , CAO Xiao-qun, MIN Jin-zhong (1. Institute of Meteorology ,PLA University of Science and Technology ,Nanjing 211101, China 2. National University of Defense Technology, Changsha 410073, China; 3. Jiangsu Key Laboratory of Meteorological Disaster,NUIST,Nanjing 210044 ,China) |
| Abstract: | The method of direct solving equations is often applied in the retrieval of lower layer 2-D winds from the dual-Doppler radar data ,but there are many limitations：singular points shall pollute their circumambient retrieval results and the observations＇ errors would affect the accuracy of retrieval, etc. A variational method in combination with a regularization method is introduced in this paper, wherein a regularization term is added to the target functional and regularization parameters are reasonably selected. Numerical experiments show that the introduction of the regularization term can efficiently filter the errors of retrieval wind field, resulted from singular points and observations, improve the retrieval accuracy, and yield the optimal global retrieval wind field. |
| Keywords: | retrieval of dual-Doppler radar variational method regularization method 2-D wind field |
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