摘要
利用NCEP再分析资料,应用WRF模式对2014年6月20—22日江西省北部低涡暴雨过程进行模拟,分析暴雨过程的环流形势、低涡的热力、动力作用和水汽输送特征。结果表明:低层中尺度低涡是此次暴雨过程形成的主要系统,暴雨区位于低涡中心附近和南侧的西南急流出口区,低涡中心上空假相当位温高能舌对应较强降水中心。低涡南侧急流出口区强偏南气流加强,为低涡发展提供了必要的能量和水汽条件,水汽的强辐合中心位于低涡中心的右前方。暴雨过程中整层水汽通量梯度大值区位于低涡东南侧。湿位涡"上正下负"的垂直分布结构有利于强降水的发生,强的负湿位涡度柱与暴雨中心有较好的对应关系。
The rainstorm which was mainly caused by mesoscale low vortex occurred in Jiangxi during 20-22 June 2014 is simulated by WRF （Weather Research and Forecasting） model. According to the model output, the diagnostic analysis is done for the heavy rainfall event to study the general circulation, the dynamic structure, and temperature-moisture features of the vortex. The results show that： the mesoseale low vortex is the direct system triggered the heavy rain which happens among the low vortex and the west- south of the jet exit zone. The high energy tongue of the pseudo-equivalent temperature over the vortex center is corresponding to the rainstorm center. The necessary energy and moisture conditions for the development of the low vortex are provided by the southern flow which is enhanced by the jet exit area south of the low vortex. Strong moisture convergence center is located in the right front of the low vortex center. And large gradient value for the whole layer moisture flux is in the southeast side of the low vortex. The s tructure of MPV ＂negative below and positive above＂ is conducive to the strong precipitation. And there is a good corresponding relationship between the strong negative vorticity column and the rainstorm center.
出处
《气象与减灾研究》
2015年第4期30-36,共7页
Meteorology and Disaster Reduction Research
基金
中国气象局预报员专项(编号:CMAYBY2013-036)
关键词
暴雨
低涡
热力作用
动力作用
水汽输送
rainstorm
low vortex
dynamic effects
the^nodynamic effects
water vapor transport.
作者简介
周雨（1988-），女，助理工程师，硕士，主要从事中小尺度数值模拟研究．E—mail：zhy_nuist@126．com
