| 回溯时间积分格式的有效性研究 |
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| 引用本文： | 游性恬,朱禾,曹鸿兴.回溯时间积分格式的有效性研究[J].大气科学,2002,26(2):249-254. |
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| 作者姓名： | 游性恬 朱禾 曹鸿兴 |
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| 作者单位： | 1.中国气象局培训中心,北京,100081 |
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| 基金项目： | 国家自然科学基金资助项目49875025和49975017 |
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| 摘 要： | 采月正压准地转模式作为动力核,用Rossby-Haurwitz波函数作为理想场,同时使用回溯时间积分格式和普通中央差格式进行数值试验.结果表明,在短时积分的情况下,回溯格式能减小数值解误差1～2个量级,而且它对时间步长的增大不敏感.因此使用回溯格式可以减少积分计算量,延长积分时效.
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| 关 键 词： | 数值模式 时间积分格式 自记忆 天气预报 |
On Efficiency of Retrospective Time Integration Scheme |
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| You Xingtian,Zhu He and Cao Hongxing.On Efficiency of Retrospective Time Integration Scheme[J].Chinese Journal of Atmospheric Sciences,2002,26(2):249-254. |
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| Authors: | You Xingtian Zhu He and Cao Hongxing |
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| Abstract: | Adopting the barotropical quasi-geostrophic model as a dynamic kernel and taking Rossby-Haurwitz wave as an idealized field, numerical weather forecast experiments were carried out by means of both retrospective time integration scheme and leapfrog one. Results show the former can reduce the forecast error at 10-1-10-2 in comparison with the latter in case of 1h to 24h lead. Moreo- ver, the retrospective scheme is little sensitive to the time-step extending. Therefore, the computational amount for numerical integrations can be saved and valid prediction time can be enlarged when using the retrospective scheme. |
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| Keywords: | numerical model time integration scheme self-memory weather forecasting |
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