宁夏两次低涡暴雨过程边界层方案的敏感性试验  

Sensitivity Tests of Boundary Layer Parameterization Schemes for Two Rainstorm Processes Caused by Low Vortexes in Ningxia

作　　者：苏洋 杨侃 马珺玢[1,2,4] 陈豫英 SU Yang;YANG Kan;MA Junbin;CHEN Yuying(Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions,China Meteordogical Administration,Yinchuan 750002,China;Ningxia Key Laboratory of Meteorological Disaster Prevention and Mitigation,Yinchuan 750002,China;Ningxia Meteorological Observatory,Yinchuan 750002,China;Ningxia Meteorological Information Center,Yinchuan 750002,China)

机构地区：[1]中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室,宁夏银川750002 [2]宁夏气象防灾减灾重点实验室,宁夏银川750002 [3]宁夏气象台,宁夏银川750002 [4]宁夏气象信息中心,宁夏银川750002

出　　处：《沙漠与绿洲气象》2023年第1期122-130,共9页Desert and Oasis Meteorology

基　　金：国家自然科学基金项目(41965001、41975176);宁夏回族自治区科技创新领军人才培养工程(2021GKLRLX05);宁夏回族自治区重点研发计划黄河流域生态保护和高质量发展科技支撑项目(2021BEG03021);中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室指令性项目(CAMP2019-01)。

摘　　要：利用中尺度数值模式WRF选取3种边界层参数化方案(YSU、MYJ和ACM2)对2018年8月20日和2019年8月2日宁夏两次低涡暴雨过程进行敏感性试验,对比分析不同边界层参数化方案对暴雨过程模拟的影响。结果表明:YSU和MYJ方案对暴雨的预报性能均较优,ACM2方案对强降水的空报率较大;YSU方案对逐时中等强度降水的模拟效果更优。YSU方案对低涡系统的移动路径和中心强度模拟效果最好。相比ACM2方案,YSU和MYJ方案对环境场物理量和边界层内水汽混合比的模拟更接近实况,并且YSU方案能准确地反映边界层内位温分布特征。YSU与ACM2方案的湍流混合强度更强,后者维持较强湍流的时间更长。总体上,YSU方案对宁夏低涡暴雨过程的模拟效果最优。A set of sensitivity experiments are conducted to compare the appliciability of three different planetary boundary layer(PBL)parameterization schemes(YSU,MYJ,and ACM2)in WRF in prediction of two heavy rainfall processes caused by vortexes in Ningxia on August 20th,2018 and August 2nd,2019.It shows that,First,the YSU and MYJ schemes perform better in torrential rain prediction,while the ACM2 scheme has a higher false rate of intense precipitation forecast.Second,YSU scheme performs best among the three schemes in prediction of rainfall with moderate intensity,and in prediction of the trajectory and the central intensity of the vortex.Third,Compared with the ACM2 scheme,YSU and MYJ schemes perform better in simulation of physical variables in environmental field and the mixing ratio of water vapor in boundary layer,and the YSU scheme could reveal the accurate distribution of potential temperature.Finally,the mixing intensities of turbulences simulated by WRF with YSU and ACM2 schemes adopted are more stronger than that with MYJ,and the simulation of intense turbulences mixing duration with ACM2 scheme selected last longer that that with the other two schemes.In general,the YSU scheme has the best simulation performance in simulating the rainstorm processes caused by low vortexes in Ningxia.

关 键 词：边界层参数化 暴雨 WRF模式 数值模拟 敏感性试验 

分 类 号：P435[天文地球—大气科学及气象学]