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High resolution simulation of the South Asian monsoon using a variable resolution global climate model

机译：使用可变分辨率全球气候模型对南亚季风的高分辨率模拟

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This study examines the feasibility of using a variable resolution global general circulation model (GCM), with telescopic zooming and enhanced resolution (~35 km) over South Asia, to better understand regional aspects of the South Asian monsoon rainfall distribution and the interactions between monsoon circulation and precipitation. For this purpose, two sets of ten member realizations are produced with and without zooming using the LMDZ (Laboratoire Meteorologie Dynamique and Z stands for zoom) GCM. The simulations without zoom correspond to a uniform 1° × 1° grid with the same total number of grid points as in the zoom version. So the grid of the zoomed simulations is finer inside the region of interest but coarser outside. The use of these finer and coarser resolution ensemble members allows us to examine the impact of resolution on the overall quality of the simulated regional monsoon fields. It is found that the monsoon simulation with high-resolution zooming greatly improves the representation of the southwesterly monsoon flow and the heavy precipitation along the narrow orography of the Western Ghats, the northeastern mountain slopes and northern Bay of Bengal (BOB). A realistic Monsoon Trough (MT) is also noticed in the zoomed simulation,together with remarkable improvements in representing the associated precipitation and circulation features, as well as the large-scale organization of meso-scale convective systems over the MT region. Additionally, a more reasonable simulation of the monsoon synoptic disturbances (lows and disturbances) along the MT is noted in the high-resolution zoomed simulation. On the other hand, the no-zoom version has limitations in capturing the depressions and their movement, so that the MT zone is relatively dry in this case. Overall, the results from this work demonstrate the usefulness of the high-resolution variable resolution LMDZ model in realistically capturing the interactions among the monsoon large-scale dynamics, the synoptic systems and the meso-scale convective systems, which are essential elements of the South Asian monsoon system.
机译：这项研究探讨了使用可变分辨率全球总体环流模式（GCM），在南亚范围内进行望远镜缩放和增强分辨率（〜35 km）的可行性，以更好地了解南亚季风降雨分布的区域方面以及季风之间的相互作用循环和降水。为此，使用LMDZ（Laboratoire Meteorologie Dynamique和Z代表缩放）GCM生成了带有或不带有缩放的两组十个成员实现。没有缩放的模拟对应于一个统一的1°×1°网格，其网格点总数与缩放版本相同。因此，缩放模拟的网格在感兴趣区域内部更精细，而外部则更粗糙。这些更精细和更粗糙的分辨率合奏成员的使用使我们可以检查分辨率对模拟区域季风气田整体质量的影响。研究发现，高分辨率季风模拟极大地改善了西南季风流和沿西高止山脉，东北山区和北部孟加拉湾（BOB）狭窄地形的强降水的表示。在缩放模拟中还注意到了一个现实的季风槽（MT），在表示相关的降水和环流特征以及MT区域中尺度对流系统的大规模组织方面也取得了显着改善。此外，在高分辨率缩放模拟中还注意到了沿MT的季风天气干扰（低和干扰）的更合理模拟。另一方面，无变焦版本在捕获凹陷及其移动方面有局限性，因此在这种情况下MT区域相对干燥。总体而言，这项工作的结果表明，高分辨率可变分辨率LMDZ模型在实际捕捉季风大尺度动力学，天气系统和中尺度对流系统之间的相互作用方面是有用的，而南半球对流系统是南方的基本要素亚洲季风系统。

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