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气象:2004,30(1):28-32
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2003年6月24~25日江南特大暴雨数值模拟和诊断分析
(1.国家气象中心,北京 100081;2.南京气象学院大气科学系)
Numerical Simulation and Diagnostic Analysis of a Heavy Rainfall in Jiangnan Area during 24-25 June 2003
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中文摘要: 采用NCAR、NCEP和FSL NOAA等共同研制的新一代细网格WRF中尺度数值模式,对2003年6月24~25日江南地区出现的一次特大暴雨过程进行了数值模拟,并利用模式输出的高分辨率动力协调资料进行了初步诊断分析。结果表明:WRF模式比较成功地再现了高低空环流形势的演变及暴雨带的分布特征;低层切变线上分布不均匀的辐合区,中低层正涡度区、高层负涡度区的配置有利于造成较强烈的中尺度上升运动;同时有很强的湿度锋区,大气处于不稳定状态。分析发现,沿850hPa切变线的局地风暴相对螺旋度与暴雨有很好的对应关系。
Abstract:A heavy rainfall during 24-25 June 2003 in the Jiangnan area is simulated by the fine meshed WRF mesoscale numerical model developed by NACR, NCEP, FSL/NOAA et al.. Analysis of the output data indicate that WRF model successfully reveals the circulation's evolution and the distribution of rainfall belt. The convergence field non homogeneously located on the low level shear line and the vorticity (positive at middle low level and negative at upper level) contribute to the strong ascending motion. The air is rather unstable near the moisture frontal zone. Results also show the positive centers of local helicity along the shear line match the heavy rainfall centers quite well.
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引用文本:
张芳华,马旭林,杨克明,2004.2003年6月24~25日江南特大暴雨数值模拟和诊断分析[J].气象,30(1):28-32.
,2004.Numerical Simulation and Diagnostic Analysis of a Heavy Rainfall in Jiangnan Area during 24-25 June 2003[J].Meteor Mon,30(1):28-32.