Abstract:
In order to verify the simulation capability of different PBL schemes in the mesoscale numerical model WRF on the atmospheric boundary layer characteristics in the Maqu region of the Tibetan Plateau, five different PBL schemes (YSU, MYJ, QNSE, ACM2, and BouLac) were selected to carry out high-resolution numerical simulations. Based on the meteorological observation data obtained from the Ruoergai Plateau Wetland Ecosystem Research Station of the Chinese Academy of Sciences, the simulation differences between different boundary layer parameterization schemes were evaluated by comparing and analyzing the characteristics of the changes in the site temperature, relative humidity, wind speed, near-surface layer (2 m) air temperature, ground temperature and surface energy under strong wind shear conditions. The results show that the ACM2 scheme demonstrated the best simulation performance for the vertical structure of boundary layer potential temperature. For relative humidity profiles, the simulation results of the non-local ACM2 scheme were better than those of the local schemes. The deviation of near-surface wind speed simulated by the ACM2 scheme was the smallest. For near-surface (2 m) temperature and surface temperature, the QNSE scheme yielded better results at night, while the ACM2 scheme performed best during the daytime. For heat flux simulations, the BouLac scheme showed the most accurate performance.