The representation of soil moisture freezing and its impact on the stable boundary layer
The representation of soil moisture freezing and its impact on the stable boundary layer
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DOI：
10.1002/qj.49712555904
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发表时间：
1999-10
影响因子：
8.9
通讯作者：
P. Viterbo;A. Beljaars;J. Mahfouf;J. Teixeira
中科院分区：
文献类型：
--
作者：
P. Viterbo;A. Beljaars;J. Mahfouf;J. Teixeira
1993年至1996年版本的欧洲中期天气预报中心模型在冬季对大陆地区有明显的近地面冷偏差。借助塔观测详细说明了该问题。结果表明，正反馈存在于陆面边界层耦合，有可能放大模式的偏差。如果表面冷却太多，边界层变得太稳定，减少向下的热通量，使表面更冷。这种正反馈被认为在模型中比在真实的大气中更强，导致日温度周期过大，并在冬季季节性时间尺度上过度冷却土壤。
The 1993 to 1996 version of the European Centre for Medium‐Range Weather Forecasts model had a pronounced near‐surface cold bias in winter over continental areas. the problem is illustrated in detail with help of tower observations. It is shown that a positive feedback exists in the land surface boundary‐layer coupling that has the potential to amplify model biases. If the surface is cooled too much the boundary layer becomes too stable, reducing the downward heat flux and making the surface even colder. This positive feedback is believed to be stronger in the model than in the real atmosphere, resulting in diurnal temperature cycles that are too large and in excessive soil cooling on a seasonal time‐scale in winter.