| ECMWF预报模式在不同地形方案下的系统误差检验 |
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| 引用本文： | 刘还珠,S.Tibaldi,吴国雄.ECMWF预报模式在不同地形方案下的系统误差检验[J].气象,1987,13(3):3-9. |
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| 作者姓名： | 刘还珠 S.Tibaldi 吴国雄 |
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| 作者单位： | 北京气象中心
(刘还珠)，ECMWF
(S. Tibaldi)，大气物理研究所(吴国雄) |
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| 摘 要： | Wallace等的研究表明,由于引进了包络地形方案,欧洲中期天气预报中心(ECMWF)的中期天气预报有所改善。本文是上述工作的继续。所用的资料为原作者的数值试验结果。检验的对象包括纬向平均风场、温度场和经圈环流,及不同波数域中的涡旋和经圈环流对角动量的平均经向输送。结果表明,在冬季,包络地形方案对低纬地区的温度场和风场的预报略有改进,对总涡旋动量通量的模拟也较好。然而对天气尺度系统的预报和对热带对流及积云摩擦的参数化却有待更进一步改善。
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Verification of systematic errors of ECMWF prediction mcdel with different orographic schemes |
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| Abstract: | The envelope orography scheme developed by Wallace et. al.has been shown to improve medium-range weather forecasts of ECMWF. Their numerical experiment data are used for this research. Verifications include zonal mean westerly wind, temperature and meridional circulation, mean meridional flux of angular momentum due to meridional circulations and planetary and synoptic scale eddies. Results show that the introduction of this scheme improves predictions of zonal temperature and wind fields in tropical troposphere, and simulates better the total eddy angular momentum flux. However predictions of synoptic scale systems and parameterizations of tropical (Convection and culmulus friction have to be improved further. |
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