摘要
利用NCEP再分析资料和WRF模式,对2013年6月26—29日江西大范围暴雨过程进行了数值模拟分析。结果表明,西太平洋副热带高压脊线稳定维持在21°N附近,副高北侧强盛西南气流将水汽向江南北部地区输送是暴雨产生和稳定维持的主要原因。超低空偏南急流的建立、发展和维持是这次连续暴雨过程产生的一个重要因素,同时低空低涡南侧出现一串近似东西向排列的30—60 km更小尺度的强对流系统,它们与大暴雨区相吻合;整层水汽通量密集区的南北界位置和暴雨区南北界位置基本吻合,整层水汽的大值中心的范围和大暴雨中心的范围具有明显的正相关关系;水汽通量散度最大辐合中心为暴雨的产生输送了大量的水汽,水汽辐合中心与暴雨的落区有很好的一致性;强降水落区与假相当位温最大值区相对应。
A heavy rainfall process occurred in Jiangxi during 26-29 June 2013. This process is simulated by using WRF model and NCEP data. The results show that stable Western Pacific subtropical high maintaining near 21°N and the strong southwest flow locating in the north of the subtropical high are the main factors for this heavy rainfall event occurring and preserving. The simulated rain bands, strong precipitation centers and intensities are accordance with the real ones. The establishment, development and maintenance of the extreme low-ahitude southerly jet are the important reasons to cause this continuous rainfall event. The center of the integrated water vapor flux has a significant positive correlation to the heavy rainfall center. The abundant water vapor transportation is produced from the moisture flux divergence center, and water vapor convergence center is in good agreement with heavy rainfall area. In addition, the θ∞ also has good correspondence with the maximum rainfall area.
出处
《气象与减灾研究》
2013年第2期42-50,共9页
Meteorology and Disaster Reduction Research
基金
国家科技部科技支撑项目(编号:2012BAK09B04)
江西省科技支撑计划项目(编号:20111BBG70031-4)
江西省气象局暴雨预报创新团队共同资助
关键词
暴雨
数值模拟
中尺度
物理量
Heavy rainfall
Numerical simulation
Mesoscale
Physical fieldt.
