不同大气边界层参数化方案对玛曲地区一次强风切变过程的适用性分析

Applicability Analysis of Different Atmospheric Boundary Layer Parameterization Schemes for a Strong Wind Shear Process in Maqu Region

  • 摘要: 青藏高原玛曲地区是青藏高原高寒草甸下垫面的典型代表,为验证中尺度数值模式WRF中不同边界层参数化方案对青藏高原玛曲地区大气边界层特征的模拟能力,选取5种不同的边界层参数化方案(YSU、MYJ、QNSE、ACM2、BouLac),开展了高分辨率的数值模拟实验,基于中国科学院若尔盖高原湿地生态系统研究站获取的多种气象要素观测资料,通过对比分析强风切变条件下位温、相对湿度、风速、近地层(2 m)气温、地温和地表能量的变化特征,评估不同边界层参数化方案之间的模拟差异。结果表明:对于边界层位温垂直结构,ACM2方案模拟效果最佳;对于相对湿度廓线,非局地方案ACM2的模拟结果优于局地方案;ACM2方案模拟的近地层风速偏差最小;对于近地层(2 m)温度和地表温度,夜间QNSE方案的模拟结果优于其他方案,而在白天ACM2方案的表现效果最佳;对于热通量,BouLac方案的模拟表现最为出色。

     

    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.

     

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