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[1]HU Haonan,LIU Yinge.Simulation of Summer Precipitation and Temperature in the Upper Reaches of the Weihe River Based on the WRF Model[J].Research of Soil and Water Conservation,2023,30(04):256-264,274.[doi:10.13869/j.cnki.rswc.2023.04.024.]

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Simulation of Summer Precipitation and Temperature in the Upper Reaches of the Weihe River Based on the WRF Model

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 04 Page number: 256-264,274 Column: Public date: 2023-06-10

Title:: Simulation of Summer Precipitation and Temperature in the Upper Reaches of the Weihe River Based on the WRF Model

Author(s):: HU Haonan¹, LIU Yinge²; (1.School of History and Civilization, Shaanxi Normal University, Xi'an 710119, China; 2.College of Geography and Environment, Baoji University of Arts and Sciences/Key Laboratory of Disaster Monitoring and Mechanism Simulation of Shaanxi Province, Baoji, Shaanxi 721013, China)

Keywords:: WRF model; precipitation and temperature; cumulus convection parameterization; upper reaches of the Weihe River

CLC:: P413

DOI:: 10.13869/j.cnki.rswc.2023.04.024.

Abstract:: [Objective] The aims of this study to explore the applicability of different schemes of the WRF model in the upper reaches of the Weihe River, discuss the physical mechanism of its precipitation pattern formation, and then provide a basis for the prediction of water resources and environmental management in the basin. [Methods] The latest WRF V4.1.2 model, Kain-Fritsch(K-F)and Grell-3 two cumulus convective parameterization schemes and microphysics schemes were used to conduct experiments with different resolutions on simulation and evaluation of the summer precipitation and temperature in the upper reaches of the Weihe River Basin. [Results] When the resolution is 5 km, the temperature simulated by the two schemes in June, July, and August in summer is slightly lower than the actual value, and the errors of the K-F scheme and the Grell-3 scheme are 5.8%～10% and 7%～12%, respectively. The simulation performance of the two schemes for precipitation is relatively high, and the precipitation varies irregularly with altitude and latitude, and the error tolerance rates are 13%～39% and 10%～25%. When the resolution is 2 km, the southwest, southeast and westerly winds simulated by the K-F scheme are strong, showing large fluctuations in vertical velocity, strong cumulus convective instability, and more convective precipitation. The southerly warm and humid airflow simulated by the Grell-3 scheme is stronger, the vertical velocity is larger, and it increases faster with height, which is conducive to the generation of large-scale heavy precipitation. The temperature and precipitation simulations in June, July, and August in summer at a resolution of 5 km have strong sensitivity and adaptability to the two cumulus convective parameterization schemes. The K-F scheme is better than the Grell-3 scheme in air temperature simulation, and the Grell-3 scheme is better in precipitation simulation than the K-F scheme, especially in heavy precipitation areas. When the resolution is increased to 2 km, the two schemes can simulate the spatial distribution pattern of precipitation and temperature in more detail, and the areas with high temperature and heavy precipitation can be displayed more precisely. [Conclusion] Both schemes are sensitive to the simulation of water vapor transport and vertical velocity, and the error is within an acceptable range. The K-F and Grell-3 cumulus convective parameterization schemes in the WRF model are suitable for the precipitation and temperature simulation in the upper reaches of the Weihe River.

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Last Update: 2023-06-10