Abstract
Abstract. The Weather Research and Forecasting (WRF) model is used in this study to simulate six storm events in two semi-humid catchments of northern China. The six storm events are classified into four types based on the rainfall evenness in the spatial and temporal dimensions. Two microphysics, two planetary boundary layers (PBL) and three cumulus parameterizations are combined to develop an ensemble containing 16 members for rainfall generation. The WRF model performs the best for type 1 events with relatively even distributions of rainfall in both space and time. The average relative error (ARE) for the cumulative rainfall amount is 15.82 %. For the spatial rainfall simulation, the lowest root mean square error (RMSE) is found with event II (0.4007), which has the most even spatial distribution, and for the temporal simulation the lowest RMSE is found with event I (1.0218), which has the most even temporal distribution. The most difficult to reproduce are found to be the very convective storms with uneven spatiotemporal distributions (type 4 event), and the average relative error for the cumulative rainfall amounts is up to 66.37 %. The RMSE results of event III, with the most uneven spatial and temporal distribution, are 0.9688 for the spatial simulation and 2.5327 for the temporal simulation, which are much higher than the other storms. The general performance of the current WRF physical parameterizations is discussed. The Betts–Miller–Janjic (BMJ) scheme is found to be unsuitable for rainfall simulation in the study sites. For type 1, 2 and 4 storms, member 4 performs the best. For type 3 storms, members 5 and 7 are the better choice. More guidance is provided for choosing among the physical parameterizations for accurate rainfall simulations of different storm types in the study area.
Highlights
Precipitation is a crucial element in the hydrological cycle at regional or global scales
The simulation results of the cumulative rainfall amounts from the 16 members of the physical ensemble are shown in Table 5 and ranked according to relative error (RE)
The FNL data from NCAR provide the initial and boundary conditions for the Weather Research and Forecasting (WRF) model, which is used for rainfall simulation of six representative storm events with a duration of 24 h in the Fuping and Zijingguan catchments, located in the south and the north reaches of the Daqinghe basin in semi-humid areas of North China
Summary
Precipitation is a crucial element in the hydrological cycle at regional or global scales. As the latest-generation mesoscale NWP system, the Weather Research and Forecasting (WRF) model can apply to the regions across scales from tens of meters to thousands of kilometers. The rainfall quantity and the spatial and temporal patterns of rainfall can be captured by the WRF model with high resolution. Though it has been confirmed by many studies that the WRF model performs better than the fifth-generation Penn State/NCAR (National Center for Atmospheric Research) Mesoscale Model (MM5), rainfall is still one of the most difficult variables to simulate and predict (Collischonn et al, 2005; Bruno et al, 2014; Lee et al, 2015). Because of the complicated processes of storm formation and development, the WRF model provides
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