摘要
利用WRF模式对2020年6月5日乌鲁木齐机场终端区强对流天气过程进行模拟,将模拟结果与实况进行对比,并对其成因进行诊断分析,结果表明:(1)WRF模式对此次强对流天气有较强的模拟能力。模式能够较好地描述该过程的环流形势特点及雷达回波发展特征,对乌鲁木齐机场终端区内强降雨落区和降水集中时段模拟较好,对乌鲁木齐机场大风风速模拟较准确。(2)对模拟结果分析发现,对流有效位能和假相当位温随时间的演变能够较好地描述此次强对流天气的能量累积和释放过程,对流发生前期暖湿平流的输送对热力不稳定能量的累积非常有利。(3)此次强对流天气是在低层切变辐合、偏西和西北两支气流汇合等条件下触发的,地面中尺度辐合线对强对流的组织化发展有一定的作用。前期偏西路径的水汽输送为区域降水提供了充足的水汽,而水汽最终在机场终端区内的偏南、偏东区域辐合为短时强降水提供了条件。
This study analyzes severe convective weather at Urumqi Airport Terminal area on 5 June,2020 and simulates it by WRF.The results showed that:(1)The WRF model simulated the case well and captured the synoptic situation,the development of radar echoes,the landing area of heavy precipitation,and the wind speed of the airport gale accurately.(2)The evolution of convective effective potential energy(CAPE)and pseudo equivalent potential(θse)temperature with time could describe the energy accumulation and release process of this strong convective weather.The transportation of warm and wet advection in the early stage of convection was beneficial to the accumulation of unstable thermal energy.(3)The low-level shear convergence triggered this severe convective weather.The mesoscale convergence line on the ground had an important influence on the organization and development of the severe convection.The water vapor transported from the westward in the early stage of the convection provided sufficient water vapor for regional percipitation,and the water vapor finally converging in the south and east regions of the Urumqi Airport terminal area provided conditions for the intense short-term rainfall.
作者
陈阳权
杜安妮
丁旭
秦贺
张利平
CHEN Yangquan;DU Anni;DING Xu;QIN He;ZHANG Liping(Meteorological Center of Xinjiang Air Traffic Management Bureau,Urumqi 830016,China;Xinjiang Meteorological Observatory,Urumqi 830002,China)
出处
《沙漠与绿洲气象》
2022年第2期48-55,共8页
Desert and Oasis Meteorology
基金
第二次青藏高原综合科学考察研究项目(2019QZKK0102)。
关键词
WRF模式
强对流
暴雨
触发条件
WRF model
severe convection
heavy precipitation
triggering mechanism
