The Korean Integrated Model (KIM), a recently developed nonhydrostatic global atmospheric model over a cubed‐sphere grid, was deployed in April 2020 as an operational weather forecasting model. As its application extends to research and predictions longer than the weather time scale, we evaluated the ability of the KIM on seasonal ensemble simulation for the boreal winter and summer cases with respect to seasonal mean biases. The results are compared with those obtained from a conventional hydrostatic spectral model, which has been widely used for seasonal simulations and in climate research. To isolate the origin of the error sources, the same physics packages is used in both the KIM and the reference models. The simulated mean states are very close to the reanalysis for the selected cases. Most large‐scale fields from the KIM are comparable to those from the reference model, which implies that the general features of large‐scale variables and precipitation are highly governed by physical parameterizations, and that the physics‐dynamics coupling is stable in a long‐term simulation. Large‐scale tropical circulations, such as the Hadley and Walker circulations, need to be improved for applications related to future changes and climate projections. Moreover, the results reveal that the simulated global precipitation band is misplaced and the heat fluxes over oceans are relatively misrepresented near the eastern boundaries of tropical and subtropical regions. This analysis suggests the necessity of realistic atmosphere‐ocean interactions that reflect ocean overturning circulation via ocean coupling as well as the refinement of deep and shallow convection schemes.

中文翻译：

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非静水全球大气模型在立方球面网格上的季节性表现

大韩民国综合模型（KIM）是最近开发的立方球面网格上的非静水全球大气模型，于2020年4月部署为可操作天气预报模型。由于它的应用范围超出了天气时间范围，因此我们针对季节性均值偏差评估了KIM在冬季和夏季寒冬情况下的季节总体模拟中的能力。将结果与从常规静液压光谱模型获得的结果进行比较，该模型已广泛用于季节模拟和气候研究。为了隔离错误源，在KIM和参考模型中都使用了相同的物理包。对于选定的情况，模拟的平均状态非常接近于重新分析。KIM的大多数大尺度场都可与参考模型进行比较，这意味着大尺度变量和降水的一般特征在很大程度上受到物理参数化的控制，并且物理动力学耦合在长期内是稳定的。术语模拟。对于与未来变化和气候预测有关的应用，需要改进大规模的热带环流，例如Hadley和Walker环流。此外，结果表明，在热带和亚热带地区的东部边界附近，模拟的全球降水带错位了，而海洋的热通量却相对不正确。