WRF模式陆面过程和边界层方案对鄱阳湖湖效应降水模拟的影响  

Effects of different land-surface processes and planetary boundary layer schemes in WRF on the simulation of lake-effect precipitation over Poyang Lake

作　　者：邹海波 张述文[1] 张卫东 汪兰 Zou Hai-bo;Zhang Shu-wen;Zhang Wei-dong;Wang Lan(Key Laboratory of Semi-arid Climate Changes with the Ministry of Education,College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,China;Key Laboratory of Poyang Lake Wetland and Watershed Research with the Ministry of Education,Jiangxi Normal University,Nanchang 330022,China;Meteorological Sciences Institute of Jiangxi Province,Nanchang 330096,China)

机构地区：[1]兰州大学大气科学学院,半干旱气候变化教育部重点实验室,兰州730000 [2]江西师范大学地理与环境学院,鄱阳湖湿地与流域研究教育部重点实验室,南昌330022 [3]江西省气象科学研究所,南昌330096

出　　处：《兰州大学学报（自然科学版）》2021年第1期72-81,共10页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(41865003,41765001,41575098)。

摘　　要：利用中尺度数值模式(水平分辨率1.67 km),按照4种常用边界层方案和5种常用陆面过程方案的线性组合构建了20组试验,对2015年8月13日02:00-09:00的鄱阳湖湖效应降水过程进行了模拟和分析.结果表明,鄱阳湖湖效应降水对边界层方案和陆面过程方案的选择较为敏感. 20组试验中T8(MYNN2边界层与Noah陆面)、T10(MYJ边界层与RUC陆面)、T11(QNSE边界层与RUC陆面)、T13(YSU边界层与Noah-MP陆面)和T16(MYNN2边界层与Noah-MP陆面)组合较好地模拟了此次鄱阳湖湖效应降水过程,模拟回波与实况回波的TS评分接近或超过0.4;T3(QNSE边界层与TD陆面)、T15(QNSE边界层与Noah-MP陆面)和T19(QNSE边界层与PX陆面)几乎没有模拟出湖效应降水的信号, TS评分小于0.03,其他试验模拟的湖效应降水过程明显偏弱或偏南. MYJ和MYNN2边界层方案, RUC和Noah-MP陆面过程方案能较好地模拟鄱阳湖湖效应降水的信号.对不同试验模拟结果的分析发现,模拟性能较好的试验(T10、T11和T13等)主要是因为成功地模拟出了有利于湖效应降水发展的感热、潜热通量和10 m风;模拟性能较差的试验(T19等)则未能模拟出有利的感热通量和10 m风(感热通量加热和10 m风辐合有利于激发边界层内的上升运动).The lake-effect precipitation over Poyang Lake that occurred in 02:00-09:00, 13 August 2018 was simulated by weather research and forecasting model with 5 different land-surface processes and 4 different planetary boundary layer schemes(total 20 tests). The results showed that the simulation of lake-effect precipitation over Poyang Lake was sensitive to the selections of land-surface processes and boundary layer schemes, and the T8(MYNN2 boundary and Noah surface schemes), T10(MYJ boundary and RUC surface schemes), T11(QNSE boundary and RUC surface schemes), T13(YSU boundary and Noah-MP surface schemes) and T16(MYNN2 boundary and Noah-MP surface schemes) tests reproduced this event well(TS score close or exceeding 0.4), while the T3(QNSE boundary and TD surface schemes), T15(QNSE boundary and Noah-MP surface schemes) and T19(QNSE boundary and PX surface schemes) tests hardly captured its signals(TS score less than 0.03). The rest tests had also presented this lake-effect precipitation, but the simulated reflectivity was obviously weak or southward compared to the observation. In general, MYJ and MYNN2 in the 4 boundary layer schemes, and RUC and NoahMP in the 5 land-surface schemes performed better. The main reason for the good performance tests(T10, T11, T13 etc.) was that they could produce a favorable sensitive heat flux, latent heat flux and 10 m wind over Poyang Lake to generate a lake-land breeze circulation and lake-effect precipitation. The poor performance tests(T19 etc.) could not yield favorable sensitive heat flux and 10 m wind over Poyang Lake.

关 键 词：鄱阳湖 湖效应降水 参数化方案 感热通量 湖陆风 

分 类 号：P435[天文地球—大气科学及气象学]