| 变分同化中使用背景场时尺度匹配的数值研究 |
| |
| 引用本文： | 邱崇践.变分同化中使用背景场时尺度匹配的数值研究[J].大气科学,2001,25(1):103-110. |
| |
| 作者姓名： | 邱崇践 |
| |
| 作者单位： | 兰州大学大气科学系,兰州 730000 |
| |
| 基金项目： | 国家重点基础研究发展规划项目G1998040902资助 |
| |
| 摘 要： | 分资料同化方法运用于中尺度系统的分析时，粗网格模式的输出经常被用作背景场，此时分析场和背景场之间存在尺度不一致的问题。为了让二者的尺度相匹配，文中提出可以在目标函数中增加一个过滤算子适当滤除分析场中的短波成分。应用浅水方程模式和模拟资料所作的数值试验表明，该方法可以明显地改善分析的效果。
|
| 关 键 词： | 变分资料同化 浅水方程模式 过滤算子 |
Matching Scales of the Retrieved Variables with Background Scale in Variational Assimilation: A Numerical Study |
| |
| Qiu Chongjian.Matching Scales of the Retrieved Variables with Background Scale in Variational Assimilation: A Numerical Study[J].Chinese Journal of Atmospheric Sciences,2001,25(1):103-110. |
| |
| Authors: | Qiu Chongjian |
| |
| Abstract: | The output of a model with coarser network is often used as the background in variational data assimilation for the mesoscale analysis. Under this situation, scales of the both analysis field and background are inconsistent. In order to have the scales matched to each other, it is proposed in this study that a filter operator should be added in the costfunction to appropriately filter out some of the small-scale components in the analysis fields. Testing with the shallow-water model and simulated data have shown that our method can greatly improve this analysis. |
| |
| Keywords: | variational assimilation shallow-water model filter opera |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《大气科学》浏览原始摘要信息 |
|
点击此处可从《大气科学》下载全文 |
