In this study, the Hybrid MAss flux Convection Scheme (HYMACS) is implemented in the ICOsahedral Non‐hydrostatic (ICON) weather prediction model. In contrast to conventional convection parametrization schemes, the convective up‐ and downdraughts are solely treated as subgrid‐scale processes in HYMACS, whereas the environmental subsidence is passed to the grid‐scale dynamics of the hosting model. It is shown that the operational anisotropic divergence damping in ICON distorts the grid‐scale dynamical response on the net mass transport parametrized by HYMACS. Thus, a revised numerical filter configuration is developed which focuses on both the compatibility to local mass sources (sinks) and the effective suppression of numerical modes inherent from the model's triangular grid. Evaluation of Jablonowski–Williamson dynamical core experiments reveal that the combination of an isotropic second‐order divergence damping with a modified version of the fourth‐order divergence damping outperforms against numerical filters based on diffusion. The obtained results are similar to the operational set‐up indicating just a minor effect on the properties of the dynamical core. Moreover, a series of dry mass lifting experiments with the revised numerical filter confirms its compatability with HYMACS. The distortion of the grid‐scale circulation is removed while gravity waves are still retained despite the potentially degenerative effect of the fourth‐order divergence damping. Analyses of kinetic energy spectra confirm the effective suppression of checkerboard noise for a wide range of different situations. The present study may be understood as a base for future applications of HYMACS with a full cloud model in real‐case studies.

中文翻译：

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在ICON中实施混合MAss通量对流方案（HYMACS）–首次进行理想化测试并适应当地质量源动力核心

在这项研究中，在ICOsahedral非静水（ICON）天气预报模型中实施了混合MAss通量对流方案（HYMACS）。与常规对流参数化方案相比，HYMACS中仅将对流上升和下降作为子网格规模过程，而环境沉降则传递给宿主模型的网格规模动力学。结果表明，ICON中的各向异性各向异性发散阻尼使HYMACS参数化的净质量输运过程中的网格尺度动力响应失真。因此，开发了一种修改后的数值滤波器配置，该配置着重于与本地质量源（汇）的兼容性以及对模型三角网格固有的数值模式的有效抑制。对Jablonowski-Williamson动力岩心实验的评估表明，各向同性二阶发散阻尼与四阶发散阻尼的改进版本相结合的性能优于基于扩散的数值滤波器。所获得的结果与操作设置相似，表明对动力核心的性能影响很小。此外，使用修订后的数字过滤器进行的一系列干质量提升实验证实了其与HYMACS的兼容性。尽管四阶发散阻尼有潜在的退化作用，但重力场波仍然保留的同时，网格尺度环流的畸变得以消除。动能谱分析证实了在各种不同情况下棋盘噪声的有效抑制。