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首页> 外文期刊>Pure and Applied Geophysics >Role of the Himalayan Orography in Simulation of the Indian Summer Monsoon using RegCM3
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Role of the Himalayan Orography in Simulation of the Indian Summer Monsoon using RegCM3

机译：使用RegCM3模拟喜马拉雅山地形在印度夏季风模拟中的作用

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摘要

In this study, sensitivity of the Indian summer monsoon simulation to the Himalayan orography representation in a regional climate model (RegCM) is examined. The prescribed height of the Himalayan orography is less in the RegCM model than the actual height of the Himalayas. Therefore, in order to understand the impact of the Himalayan orography representation on the Indian summer monsoon, the height of the Himalayan orography is increased (decreased) by 10 % from its control height in the RegCM model. Three distinct monsoon years such as deficit (1987), excess (1988) and normal rainfall years are considered for this study. The performance of the RegCM model is tested with the use of a driving force from the reanalysis data and a global model output. IMD gridded rainfall and the reanalysis-2 data are used as verification analysis to validate the model results. The RegCM model has the potential to represent mean rainfall distribution over India as well as the upper air circulation patterns and some of the semi-permanent features during the Indian summer monsoon season. The skill of RegCM is reasonable in representing the variation in circulation and precipitation pattern and intensity during two contrasting rainfall years. The simulated seasonal mean rainfall over many parts of India especially, the foothills of the Himalaya, west coast of India and over the north east India along with the whole of India are more when the orography height is increased. The low level southwesterly wind including the Somali jet stream as well as upper air circulation associated with the tropical easterly jet stream become stronger with the enhancement of the Himalayan orography. Statistical analysis suggests that the distribution and intensity of rainfall is represented better with the increased orography of RegCM by 10 % from its control height. Thus, representation of the Himalayan orography in the model is close to actual and may enhance the skill in seasonal scale simulation of the Indian summer monsoon.
机译：在这项研究中，检查了印度夏季风模拟对区域气候模型（RegCM）中的喜马拉雅地形学表示的敏感性。在RegCM模型中，喜马拉雅山地形的规定高度小于喜马拉雅山的实际高度。因此，为了了解喜玛拉雅地形的表现形式对印度夏季风的影响，喜玛拉雅地形的高度比RegCM模型中的控制高度增加了10％。这项研究考虑了三个不同的季风年，例如赤字（1987），超额（1988）和正常降雨年。使用来自重新分析数据的驱动力和全局模型输出来测试RegCM模型的性能。 IMD栅格化降雨和reanalysis-2数据用作验证分析，以验证模型结果。 RegCM模型可能代表印度夏季季风季节的平均降雨分布，高空环流模式以及一些半永久性特征。 RegCM的技术在表示两个相对降雨年的环流和降水模式以及强度变化方面是合理的。当地形高度增加时，印度许多地区，特别是喜马拉雅山，印度西海岸和印度东北部以及整个印度的模拟季节性平均降雨量更多。随着喜马拉雅地形的增强，包括索马里急流在内的低水平西南风以及与热带东风急流相关的高空环流变得更强。统计分析表明，随着RegCM地形比其控制高度增加10％，降雨的分布和强度表现得更好。因此，模型中喜马拉雅山地形的表示接近实际，并且可以增强印度夏季风的季节尺度模拟的技能。

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