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首页> 外文期刊>Advances in Geosciences >Downscaling heavy rainfall in the subtropics – a simple approach for dynamical nesting
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Downscaling heavy rainfall in the subtropics – a simple approach for dynamical nesting

机译：减少亚热带地区的大雨-动态嵌套的简单方法

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The simulation of local scale precipitation with nested models often suffersfrom large errors in the boundary rows. Advection of precipitation into themodel domain of the small scale model can lead to an overestimation ofprecipitation in the boundary grid cells of the nested model and a drying ofthe interior grid area. Consequently, the finer scale structure of rainfallevents of the small scale model can not evolve. These errors result fromthree main sources: "dynamical", "scale", and "parameterization" problems.As a first step to reduce the "parameterization" boundary errors, we proposea nesting procedure where rainwater from the driving larger scale model isconverted to cloud water in the smaller scale model. The nesting method isapplied to a case study of heavy rainfall in semi-arid southern Morocco. Theresults show the elimination of erroneous excessive rainfall in the boundaryrows and slightly enhanced rainfall in the interior of the nested modeldomain. Additionally, fine scale structures in the precipitation patternsdevelop. The excessive surface runoff is clearly diminished in comparison tothe standard nesting procedure. The proposed approach enables scaleconsistent precipitation patterns resulting from model physics andgrid-resolution of the smaller scale model for the complete model domain.
机译：用嵌套模型模拟局部尺度的降水常常在边界行中遭受很大的误差。降水进入小规模模型的模型域会导致对嵌套模型边界网格单元中降水的高估以及内部网格区域的干燥。因此，小尺度模型的降雨事件的精细尺度结构无法演化。这些错误是由“动力”，“规模”和“参数化”三个主要问题引起的。作为减少“参数化”边界误差的第一步，我们提出了一种嵌套程序，其中将驱动较大规模模型的雨水转化为云水在较小规模的模型中。嵌套法适用于摩洛哥南部半干旱地区强降雨的案例研究。结果表明，消除了边界行中错误的过量降雨，并减少了嵌套模型域内部的降雨。此外，在降水模式中形成了精细的尺度结构。与标准套料程序相比，明显减少了过多的表面径流。所提出的方法使得尺度一致的降水模式成为可能，这是由于模型物理和较小尺度模型在整个模型域的网格分辨率所导致的。

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