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首页> 外文期刊>Journal of the Atmospheric Sciences >A parameterization for the triggering of landscape-generated moist convection. part II: Zero-order and first-order closure
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A parameterization for the triggering of landscape-generated moist convection. part II: Zero-order and first-order closure

机译：用于触发景观生成的湿对流的参数化。第二部分：零阶和一阶闭包

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To improve the triggering of clouds over landscape heterogeneity, it is suggested that the forcing by mesoscale circulations generated by landscape patches be included. For this purpose, it is suggested that a relatively simple zero-order closure be used to obtain a triggering parcel's mesoscale perturbation vertical velocity, potential temperature, and specific humidity. In combination with a turbulent fluctuation averaged over a parcel area, one can obtain a parcel's (total) velocity, temperature, and moisture. The authors used similarity theory to parameterize the mesoscale perturbations, using a dataset generated by a three-dimensional, high-resolution cumulus ensemble model with west-to-east land surface patches. Alternatively, the authors used one-dimensional budget equations that contain mesoscale and turbulent fluctuations (and source terms) to obtain the vertical profile of potential temperature and specific humidity within a triggering parcel. Here, it is suggested that first-order closure be used; these equations with first-order closure should provide more realistic profiles of temperature and moisture within a triggering parcel than with the zero-order scheme above. This is especially the case when moist (cloud) processes occur. An analysis of the model-produced dataset indicated that parameterizations for two terms needed to be developed to close the budget equations: the vertical flux of the mesoscale temperature and moisture. Similarity theory is used to parameterize these fluxes. [References: 24]
机译：为了改善云对景观异质性的触发作用，建议包括由景观斑块产生的中尺度环流的强迫作用。为此，建议使用相对简单的零阶闭合来获得触发包裹的中尺度摄动垂直速度，势能和比湿。结合在整个包裹区域平均的湍流涨落，可以获得包裹的（总）速度，温度和湿度。作者使用相似性理论对中尺度扰动进行参数化，使用由具有东西向陆地表面斑块的三维高分辨率高分辨率积云集合模型生成的数据集。另外，作者使用包含中尺度和湍流波动（和源项）的一维预算方程来获得触发包裹内潜在温度和特定湿度的垂直分布。在这里，建议使用一阶闭包。与上面的零阶方案相比，这些具有一阶闭合的方程应该在触发包裹内提供更逼真的温度和湿度曲线。当发生潮湿（云）过程时，尤其如此。对模型产生的数据集的分析表明，需要开发两个术语的参数化以关闭预算方程：中尺度温度和湿度的垂直通量。相似性理论用于参数化这些通量。 [参考：24]

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