Sensitivity Analysis of Different Boundary Layer Parameterization Schemes in High-Resolution Climate Simulation over East of Southwestern China
To further assess and enhance the capabilities of regional models for high-resolution climate simulation in the east of Southwestern China(ESWC),the present study investigated two nested simulations(with D01 as the outer domain and D02 as the inner domain)of summer rainfall and temperature over the ESWC from 1998 to 2019.These simulations were conducted using the Weather Research and Forecasting(WRF)model coupled with various boundary layer parameterization schemes.The findings indicated that different parameterization schemes can lead to biases in the simulated mean annual rainfall.Specifically,the D01 domain exhibited a noticeable wet bias,while the D02 domain showed a dry bias in the Sichuan Basin and the lower altitudes of Chongqing.A wet bias was predominantly found in the complex terrain areas of Chengkou,Shizhu and Wulong in Chongqing,as well as in Guizhou.Overall,the YSU scheme in D01 and the MYJ scheme in D02 demonstrated the smallest bias in rainfall simulations.Regarding temperature simulations,a noticeable warm bias was present in D01 for the Sichuan Basin,with a cold bias in other areas.In D02,a warm bias was observed for most regions.The MYJ scheme exhibited the least bias,while the YSU scheme showed the greatest bias in both domains.The WRF model skillfully reproduced the interannual variability of rainfall and temperature in the midwest of Chongqing and most of Hubei.The YSU scheme outperformed others in rainfall simulation,while the MYJ scheme excelled in temperature simulation.These results suggest that the choice of an optimal scheme may vary depending on the meteorological parameter of interest,especially after model resolution is enhanced to the convective scale.Therefore,it is crucial to select the most suitable local scheme based on operational requirements.
East of Southwest ChinaWRF modelboundary layer parameterization scheme
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