In a previous paper we described a new technique for automatically generating parameterisations using a program called iGen. iGen generates parameterisations by analysing the source code of a~high resolution model that resolves the physics to be parameterised. In order to demonstrate that this technique scales up to deal with models of realistic complexity we have used iGen to generate a parameterisation of entrainment in marine stratocumulus. We describe how iGen was used to analyse the source code of an eddy resolving model (ERM) and generate a parameterisation of entrainment velocity in marine stratocumulus in terms of the large-scale state of the boundary layer. The parameterisation was tested against results from the DYCOMS-II intercomparison of ERM models and iGen's parameterisation of mean entrainment velocity was found to be 5.27 � 10�3 ± 0.62 � 10�3 m s�1 compared to 5.2 � 10�3 ± 0.8 � 10�3 m s�1 for the DYCOMS-II ensemble of large eddy simulation (LES) models.
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机译：在先前的论文中，我们描述了一种使用名为iGen的程序自动生成参数化的新技术。 iGen通过分析高分辨率模型的源代码来生成参数化，该高分辨率模型解析了要参数化的物理学。为了证明该技术可以扩展以处理实际复杂性模型，我们使用了iGen来生成海洋平积云中夹带的参数化。我们描述了如何使用iGen分析涡旋解析模型（ERM）的源代码，并根据边界层的大尺度状态生成海洋平积层中夹带速度的参数化。针对ERM模型的DYCOMS-II相互比较的结果对参数化进行了测试，发现iGen的平均夹带速度参数化为5.27×10×3±0.62×10×3 m s±1，而5.2为大涡模拟（LES）模型的DYCOMS-II合奏的±10×3±0.8×10×3 m s±1。
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