Systematic model forecast error in Rossby wave structure

Systematic model forecast error in Rossby wave structure
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罗斯贝波结构的系统模型预报误差

DOI:
10.1002/2014gl059282
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发表时间:
2014
影响因子:
5.2
通讯作者:
Gray S
Gray S
中科院分区:
地球科学1区
文献类型:
--
作者:
Gray S

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非绝热过程可以改变Rossby波的结构,因此,模型过程产生的误差传播下游。然而,来自初始条件不确定性的预测的混乱传播使得难以从均方根预测误差追溯到模型误差。在这里,诊断不受相位误差的使用,使调查的系统性误差Rossby波在冬季预报从三个业务中心。脊附近的对流层顶锐度随预报提前时间而减小。它强烈依赖于模型的分辨率,即使模型是在一个共同的网格上检查。Rossby波振幅减少与铅5天,符合代表性不足的非绝热修改和运输的空气从对流层下部到对流层上部的脊,并与对流层顶的湿度梯度太弱。然而,当分辨率降低时,幅度也降低。进一步的工作是必要的,以隔离的非绝热过程的代表性的错误的贡献。
Diabatic processes can alter Rossby wave structure; consequently, errors arising from model processes propagate downstream. However, the chaotic spread of forecasts from initial condition uncertainty renders it difficult to trace back from root‐mean‐square forecast errors to model errors. Here diagnostics unaffected by phase errors are used, enabling investigation of systematic errors in Rossby waves in winter season forecasts from three operational centers. Tropopause sharpness adjacent to ridges decreases with forecast lead time. It depends strongly on model resolution, even though models are examined on a common grid. Rossby wave amplitude reduces with lead 5 days, consistent with underrepresentation of diabatic modification and transport of air from the lower troposphere into upper tropospheric ridges, and with too weak humidity gradients across the tropopause. However, amplitude also decreases when resolution is decreased. Further work is necessary to isolate the contribution from errors in the representation of diabatic processes.
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