| 用非线性近似方法反演单多普勒雷达风场(英) |
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| 作者姓名： | ZHAO Kun LIU Guoqing GE Wenzhong DANG Renqing Takao TAKEDA |
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| 作者单位： | Department of Atmospheric Sciences，Nanjing University，Department of Atmospheric Sciences，Nanjing University，Department of Atmospheric Sciences，Nanjing University，Department of Mathematics，Nanjing University of Technology，Institutes for Hydrospheric Atmospheric Sciences Nanjing 210093，Nanjing 210093，Nanjing 210093，Nanjing 210009，Nagoya University，464-8601 Japan |
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| 基金项目： | The authors would like to express their thanks to the GAME/HUBEX Project Office for assistance. |
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| 摘 要： | 回顾了近年来由单多普勒雷达观测反演风场的各种方法。这些方法大部分基于线性假设,因此风场的非线性变化经常影响反演结果,使得反演的风场误差增大。我们提出一种以非线性近似理论为基础的反演方法,该方法主要考虑了风场分片光滑的特点并充分利用了雷达的径向风场数据。我们把该方法应用到1998年淮河能量与水循环实验的两个个例中。通过同双多普勒雷达观测的结果比较,发现该方法能反演较高分辨率和准确性的水平风场,反演的垂直风场也比较合理。
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| 关 键 词： | 非线性近似 分片光滑 基函数 |
| 收稿时间： | 5 August 2002 |
Retrieval of Single-Doppler Radar Wind Field by Nonlinear Approximation |
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| ZHAO Kun,LIU Guoqing,GE Wenzhong,DANG Renqing,Takao TAKEDA.Retrieval of Single-Doppler Radar Wind Field by Nonlinear Approximation[J].Advances in Atmospheric Sciences,2003,20(2):195-204. |
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| Authors: | ZHAO Kun LIU Guoqing GE Wenzhong DANG Renqing and Takao TAKEDA |
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| Institution: | Department of Atmospheric Sciences, Nanjing University, Nanjing 210093,Department of Mathematics, Nanjing University of Technology, Nanjing 210009,Department of Atmospheric Sciences, Nanjing University, Nanjing 210093,Department of Atmospheric Sciences, Nanjing University, Nanjing 210093,Institutes for Hydrospheric Atmospheric Sciences, Nagoya University, 464-8601 Japan |
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| Abstract: | The methods employed in recent years to retrieve vector wind information from single-Doppler radar observation are reviewed briefly. These methods are based on a linearity hypothesis for the wind field, so the retrieved wind field is sometimes negatively affected by the non-linearity of wind. This paper proposes a new method based on a non-linear approximation technique. This method, which relies on the piecewise smooth property of the wind field and makes full use of the radar velocity data, is applied to two cases of the Huaihe River Basin Energy and Water Cycle Experiment (HUBEX) in 1998. Checked against the wind field observed by dual-Doppler radar, the retrieved wind field by the method presented in this paper yields a relatively accurate horizontal vector wind field with high resolution, as well as a reasonable estimate of the magnitude of vertical velocity. |
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| Keywords: | nonlinear approximation piecewise smooth wind field basis function |
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