Monsoonal precipitation over Peninsular Malaysia in the CMIP6 HighResMIP experiments: the role of model resolution
Monsoonal precipitation over Peninsular Malaysia in the CMIP6 HighResMIP experiments: the role of model resolution
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DOI：
10.1007/s00382-021-06033-y
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发表时间：
2021-08
期刊：
影响因子：
4.6
通讯作者：
Ju Liang;M. Tan;M. Hawcroft;J. Catto;K. Hodges;J. Haywood
中科院分区：
文献类型：
--
作者：
Ju Liang;M. Tan;M. Hawcroft;J. Catto;K. Hodges;J. Haywood
本文研究了20个模式的模拟能力，这些模式对CMIP6 HighResMIP在不同季风季节的降水和马来西亚半岛极端降水事件的模拟能力做出了贡献。模式试验利用共同的强迫，但以不同的水平和垂直分辨率运行。通过比较三个观测降水资料集和四个气候再分析在不同分辨率下的多模式组合，评估了分辨率对模式模拟降水和相关环境场能力的影响。水平和垂直分辨率较高的模式模拟在模拟马来西亚半岛和沿海地区降水和极端降水的年循环中表现出较好的效果。在不同季节降水和季风强度的统计关系中也发现了与水平和垂直分辨率增加有关的改进。然而，与低垂直分辨率模式相比，垂直分辨率的增加可能导致年平均降水减少，这与不同季风季节对水汽辐散的高估和对流层下层垂直上升的低估有关。这限制了在高垂直分辨率实验中对降水模拟的任何改进，特别是在西南季风季节。
This study investigates the ability of 20 model simulations which contributed to the CMIP6 HighResMIP to simulate precipitation in different monsoon seasons and extreme precipitation events over Peninsular Malaysia. The model experiments utilize common forcing but are run with different horizontal and vertical resolutions. The impact of resolution on the models’ abilities to simulate precipitation and associated environmental fields is assessed by comparing multi-model ensembles at different resolutions with three observed precipitation datasets and four climate reanalyses. Model simulations with relatively high horizontal and vertical resolution exhibit better performance in simulating the annual cycle of precipitation and extreme precipitation over Peninsular Malaysia and the coastal regions. Improvements associated with the increase in horizontal and vertical resolutions are also found in the statistical relationship between precipitation and monsoon intensity in different seasons. However, the increase in vertical resolution can lead to a reduction of annual mean precipitation compared to that from the models with low vertical resolutions, associated with an overestimation of moisture divergence and underestimation of lower-tropospheric vertical ascent in the different monsoon seasons. This limits any improvement in the simulation of precipitation in the high vertical resolution experiments, particularly for the Southwest monsoon season.