| 用实测风场资料提取基本气流 |
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| 引用本文： | 黄思训,张铭,安洁.用实测风场资料提取基本气流[J].应用气象学报,2004,15(5):572-578. |
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| 作者姓名： | 黄思训 张铭 安洁 |
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| 作者单位： | 解放军理工大学气象学院, 南京 211101 |
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| 基金项目： | 国家重点基础研究发展规划项目G1 9980 40 90 7，国家自然科学基金 40 0 75 0 1 4、40 1 75 0 1 4共同资助 |
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| 摘 要： | 该文从f平面线性无粘的二维Boussinesq方程组出发, 通过求取函数的极小值, 提出了从实测风场资料中提取基本气流的方案。用该方案提取的基本气流既满足控制方程, 同时又与实测风场之差其模的平方在垂直方向取平均后达到最小; 将实测风场与该基本气流相减, 可提取出扰动风场, 从而能研究基流的失稳问题和扰动场随时间的演变。该文还给出了该方案实际操作的数值计算方法, 并对实际个例进行了计算和分析, 实践表明用该方案提取基本气流是切实可行的。
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| 关 键 词： | 实测风场资料 基本气流 极小值 |
| 收稿时间： | 2003-03-27 |
| 修稿时间： | 2003年3月27日 |
Extracting Basic Flow from Observational Wind |
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| Huang Sixun,Zhang Ming,An Jie.Extracting Basic Flow from Observational Wind[J].Quarterly Journal of Applied Meteorology,2004,15(5):572-578. |
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| Authors: | Huang Sixun Zhang Ming An Jie |
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| Affiliation: | Meteorology College of Science & Technology University of P.L.A., Nanjing 211101 |
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| Abstract: | A f plane approximation, linear and nonviscous two dimensional Boussinesq equations is used to extract basic flow from observational wind field by determining functional minimum. On one hand, the basic flow extracted by this method is satisfied with the governing equation. On the other hand, squared the mode of dispersion between the basic flow and the observational wind, then take the average of them along the perpendicular direction, the result obtained is minimum. Subtracting the basic flow from observational wind field, the disturbance wind field can be extracted, and the instability problem of basic field and the temporal evolvement of disturbance field are studied. Here the scheme of numerical calculation and the cases of real operational works are presented too, which indicate the feasibility of the method. |
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| Keywords: | Observational wind field data Basic flow Functional minimum |
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