摘要
Abstract
Objective] The aim was to analyze effects of different boundary layer parameterization schemes on precipitation simulation results in the heavy rainfall process.[Method] Using WRF mode 3.4 version,sensitivity test was conducted on “7.18” Shandong heavy rainfall process, effects of different boundary layer parameterization schemes on precipitation distribution,extreme occurrence time,BS and ETS scoring results were analyzed.[Result] The results showed that the rain band’s general trend can be well simulated no matter the PBL parameterization schemes are used or not,but simulation of the intensity and location of the rainfall center differ to some extent .The showing up time of the rain peak ob-tained by different PBL schemes is generally 2-3 hours later than the actual result,and their rain peaks greatly differ with each other,among which the result of YSU scheme’s simulation is the best.Synthesizing the result of ETS (Equitable Threat Score) and BS (Brier Score) show that no use of PBL schemes is the best for the simulation in the case of small amount of precipitation (i.e.,less than 25 mm),while Boulac scheme is more appropriate in the case of medium rainfall-class (i.e.,25-50 mm).As for rainstorm or extreme precipitation (i.e.,more than 50 mm), YSU scheme gets the best result.[Conclusion] Different boundary layer parameterization schemes in WRF mode have significant influence on simulation results of rainstorm ,using appropriate boundary layer parameterization scheme can improve the accuracy of precipitation forecast signif-icantly.关键词
暴雨/WRF模式/敏感性试验/边界层参数化方案/降水Key words
Rainstorm/WRF model/Sensitive experiments/Boundary layer parameterization schemes/Precipitation分类
农业科技
