基于WRF模式热带气旋对西南低涡暴雨作用数值试验研究  

NUMERICAL EXPERIMENTATION STUDY OF THE TROPICAL CYCLONE STORM EFFECT ON THE SOUTHWEST VORTEX RAINSTORM BASED ON WRF MODEL

作　　者：李强 刘德 陈贵川 王中[2] 廖峻 

机构地区：[1]重庆市气象台,重庆401147 [2]重庆市人工影响天气办公室,重庆401147

出　　处：《长江流域资源与环境》2013年第3期359-368,共10页Resources and Environment in the Yangtze Basin

基　　金：2013年气象关键技术集成与应用项目(CMAGJ2013M42);重庆市气象局开放式研究基金项目(kfjj-201101);重庆市气象局2010年科技计划项目(zl-201003);重庆市气象局2012年业务科技攻关项目(ywgg-201201;ywgg-201205)

摘　　要：基于WRF模式,利用发生在远距离"天鹅"台风作用下的西南低涡暴雨个例,通过修改台风动力风场,分析了不同数值试验中西南低涡降水系统对台风系统的响应。结果表明:在"天鹅"台风作用下,增强了水汽和不稳定能量的输送,导致了长时间强降水的发生;不同的台风动力风场作用下,西南低涡的移动路径具有明显的不同,降水也具有明显的区域性局地差异;在增强(减弱)台风倒槽动力风场环流作用下,低涡系统中心偏西(东)偏北(南),相应地,低空急流输送带偏东(西),进而导致中低层水汽和不稳定能量输送偏东(西),以及中低层辐合带空间位置偏东(西),进而对区域性降水空间位置产生影响,导致了降水区域局地性差异,表明远距离台风对西南低涡环流系统具有重要影响。Based on WRF model, the response of southwest vortex precipitation systems to the typhoon were studied at different numerical experimentation with modifying the typhoon dynamic winds by means of the southwest vortex heavy rain case affected by the long-distance typhoon. The results showed that the transportation of water vapor and the instability energy enhanced the role of the Swan typhoon,which resulted in the occurrence of heavy rainfall prolonged. The southwest vortex moving path had obvious differences and the precipitation had significant regional local differences with the effect of different typhoon dynamic winds. When the southwest vortex system center extended westward （eastward） and northward （southward） ,the low-level jet stream belt was westward （eastward）,which led to moisture and instability energy transportation and spatial location of convergence zone being west （east） in the middle and low level correspondingly. The regional rainfall distribution was influenced and the local difference of precipitation area was obvious. The long-distance typhoon had a significant impact on the southwest vortex circulation system.

关 键 词：台风 西南低涡 低空急流 V分量 

分 类 号：P461[天文地球—大气科学及气象学]