The Botswana High is a prominent mid-tropospheric system that modulates rainfall over subtropical southern Africa, but the capability of a global climate model (GCM) to reproduce it remains unknown. This study examines the capability of a GCM with quasi-uniform resolution (Model Prediction Across Scales, hereafter MPAS) in simulating the characteristics of the Botswana High. The MPAS is applied to simulate the global climate at 240 km quasi-uniform resolution over the globe for the period 1980–2010. The model results are validated against gridded observation dataset (Climate Research Unit, CRU), satellite dataset (Global Precipitation Climatology Project, GPCP), and reanalysis datasets (Climate Forecast System Reanalysis, CFSR; the National Oceanic and Atmospheric Administration, NOAA; and the European Centre for Medium-Range Weather Forecasts version 5, ERA5). In general, MPAS replicates all the essential features in the climatology of temperature, rainfall, 500 hPa geopotential height and vertical motion over southern Africa, reproduces the spatial and temporal variation of the Botswana High, and captures the influence of the Botswana High on droughts and deep convections over the sub-continent. In addition, the model reproduces well the anomalies in vertical motion over subtropical southern Africa during +ve and −ve phases of the Botswana High. However, the model struggles to reproduce the precipitation pattern associated with the positive and negative modes of the Botswana High. The results of this study have an application in understanding the characteristics of the Botswana High and in improving MPAS for seasonal forecasting over southern Africa.

博茨瓦纳高压是一个突出的中对流层系统，它调节非洲南部亚热带的降雨量，但全球气候模型 (GCM) 再现它的能力仍然未知。本研究检验了具有准均匀分辨率（跨尺度模型预测，以下简称 MPAS）的 GCM 在模拟博茨瓦纳高地特征方面的能力。MPAS 用于模拟 1980-2010 年期间全球 240 公里准均匀分辨率的全球气候。模型结果根据网格观测数据集（Climate Research Unit，CRU）、卫星数据集（Global Precipitation Climatology Project，GPCP）和再分析数据集（Climate Forecast System Reanalysis，CFSR；美国国家海洋和大气管理局，NOAA；和欧洲中期天气预报中心第 5 版，ERA5）。总的来说，MPAS 复制了南部非洲的温度、降雨量、500 hPa 位势高度和垂直运动等气候学的所有基本特征，再现了博茨瓦纳高压的时空变化，并捕捉了博茨瓦纳高压对干旱和干旱的影响。次大陆上空的深层对流。此外，该模型很好地再现了博茨瓦纳高压 +ve 和 -ve 阶段在非洲南部亚热带上空的垂直运动异常。然而，该模型难以再现与博茨瓦纳高压的正负模式相关的降水模式。