Due to complex topography in Southwest China （SWC）， state-of-the-art climate models cannot capture sufficiently the distribution and intensity of summer precipitation， especially extreme rainfall （ER） over SWC.Thus， this study is to evaluate how well the current climate models could reproduce the climate mean summer precipitation and to what extend the horizontal resolutions might impact the ER simulations over SWC， based on daily rain-gauge station-observed， satellite-observed and ERA5-reanalysed rainfall datasets and 12 models available from CMIP6 High-Resolution Model Inter-comparison Project （HighResMIP）.Each HighResMIP model contains one high-resolution and one low-resolution simulation with the same suite of physical processes and external forcing.Results show that almost all models can reproduce the climate-mean state of summer rainfall over SWC， with an area correlation coefficient （ACC） greater than 0.75 between the rain-gauge observed rainfall and simulated rainfall by each model.Over， the performance of CMIP6 HighResMIP models is better than that of CMIP5 models， but over half of the CMIP6 HighResMIP models still underestimate the summer rain amount over the Sichuan Basin.As the model resolution increased， the intensity and spatial pattern of the simulated summer rainfall over the Hengduan mountains are much closer to the observational dataset， especially to the ERA5 reanalysis.However， the underestimating biases over Sichuan Basin are not improved obviously with a higher horizontal resolution.In terms of ER， large spreads exist in the ER intensity and occurrence frequency over SWC among CMIP6 HighResMIP models.The four models， including CNRM-CM6、 FGOALS-f3、 GFDL-CM4 and HadGEM-GC31， exhibit better performances in capturing ER days and percentage.Even so， the first three of the above four models underestimate the ER days over SWC， but HadGEM-GC31 overestimates ER intensity over Guangxi Province.In contrast， the ER frequency is much lower than that of observation in the models ECMWF-IFS， EC-Earth3P， IPSL-CM6A， MPI-ESM1-2 and MRI-AGCM3-2.The higher resolution simulations can improve the simulation in the rainfall intensity to a certain degree， manifesting mainly in enhancing the rainfall intensity over the mountainous region rather than the flat-terrain area such as the Sichuan Basin.
HUANG Zili
,
WU Xiaofei
,
MAO Jiangyu
. An Evaluation for Impacts of the Horizontal Resolution of CMIP6 Models on Simulating Extreme Summer Rainfall over Southwest China[J]. Plateau Meteorology, 2021
, 40(6)
: 1470
-1483
.
DOI: 10.7522/j.issn.1000-0534.2021.zk010
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