| 台风阻塞形势下两次四川盆地持续性暴雨过程对比研究 |
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| 引用本文： | 吕斌,刘毅,孙俊,邓国卫,张敏,王腾蛟.台风阻塞形势下两次四川盆地持续性暴雨过程对比研究[J].高原山地气象研究,2021,41(1):49-58. |
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| 作者姓名： | 吕斌 刘毅 孙俊 邓国卫 张敏 王腾蛟 |
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| 作者单位： | 1.四川省德阳市气象局，德阳 618000 |
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| 基金项目： | 高原与盆地暴雨旱涝灾害四川省重点实验室重点专项(2018-重点-11) |
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| 摘 要： | 利用 CMORPH融合资料、地面降水资料和卫星云图资料，针对2015年6月22~24日（过程一）和2018年7月10~12日（过程二）四川省持续性暴雨过程，从动力、热力、水汽、云图等多方面进行对比分析。结果表明:两次过程的落区、强度均不相同；过程一主要降水产生于四川盆地东北部到中部，48h内共有338个区域自动站出现了暴雨以上的降水，最大雨量达到313.5mm；过程二强降水出现在四川盆地西北部，48h内共有942个区域自动站出现了暴雨以上的降水，最大雨量达到481.7mm。两次过程都有高空低槽、台风、切变线等多个不同尺度影响系统的相互作用；台风登陆点对四川盆地的暴雨落区有明显影响，台风从广西登陆，盆地降水偏北，而从东部沿海登陆，盆地降水偏西。两次过程低槽均为后倾槽，斜压特征明显；过程一降水激发了盆地涡的生成，盆地涡又使得降水持续，整个降水过程基本处于不稳定层结下，有MCC生成，多个时次的1h降水超过30mm；过程二随着副高东退，低槽东移，降水由前期的对流性转为稳定性降水。从位涡发展和移动来看，两次过程高位涡与强降水的发生时段吻合，位涡指示四川盆地暴雨落区具有重要的参考价值。
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| 关 键 词： | 四川盆地 持续性暴雨 对比分析 台风 阻塞 |
| 收稿时间： | 2021-02-18 |
Comparative Study on Two Persistent Rainstorms in Sichuan Basin under the Blocking Form of Landing Typhoon |
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| Institution: | 1.Deyang Meteorological Bureau, Deyang 618000, China2.Chongqing Meteorological Observatory，Chongqing 401147, China3.Heavy Rain and Drought - Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072, China4.Sichuan Branch of China Meteorological Administration Training Centre, Chengdu 610072, China5.Sichuan Climate Center, Chengdu 610072, China6.Suining Meteorological Bureau, Suining 627000, China |
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| Abstract: | Using CMORPH fusion data, surface precipitation data and satellite cloud image data, the persistent rainstorm processes in Sichuan Province from June 22 to 24, 2015(Process 1) and July 10 to 12, 2018 (Process 2)are studied. The two processes are compared and analyzed from the aspects of power, heat, water vapor and cloud images. The results show that: The falling area and strength of the two processes are different. In Process 1,the main precipitation was generated from northeast to central Sichuan Basin. Within 48 h, the precipitation above rainstorm was monitored in 338 regional automatic stations, and the maximum rainfall reached 313.5 mm. In Process 2, heavy rainfall occurred in the northwest of Sichuan Basin. In 48 hours, the heavy rainfall and above was monitored in 942 regional automatic stations, and the maximum rainfall reached 481.7mm. The two processes were formed by the interaction of multi-scale influence system such as high-altitude troughs, typhoons, shear lines. The landing path of the typhoon has an obvious influence on the rainstorm area of the Sichuan Basin.When typhoon landed from Guangxi, the precipitation tended to the north, while when typhoon landed from the eastern coast, the precipitation tended to the west. The two processes were backward dip trough with obvious baroclinic characteristics.In Process 1, precipitation stimulated the formation of basin vortex, which made the precipitation continue,the whole precipitation process was under unstable stratification, and MCC generated, and the precipitation was more than 30mm in one hour. In Process 2, as the subtropical high recedes eastwarded and the trough moved eastward, the precipitation changed from early convective precipitation to stable precipitation. From the development and movement of potential vorticity, the high potential vorticity of the two processes coincides with the occurrence period of heavy precipitation, and the use of potential vorticity has important reference value for the indication of torrential rain in Sichuan Basin. |
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