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高低空急流与台风环流耦合下的中尺度暴雨系统
MESOSCALE RAINSTORM SYSTEM UNDER THE COUPLING OF LOW-LEVEL AND UPPER-LEVEL JETS AND TYPHOON CIRCULATION
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摘要: 对9216号台风登陆后进入200 hPa西南风急流入口区右侧, 引起远距离台风中尺度暴雨系统突然发生发展的过程进行了分析.利用二维模式研究了高、低空急流与台风环流耦合和中尺度暴雨增幅的相互促进正反馈机制, 认为Wave-CISK过程和斜压基流的对称不稳定可能是低空急流发展和倒槽形成的更切合实际的动力机制.对流不稳定与斜压大气的结合有利于北传的重力惯性波不稳定发展.
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关键词:
- 急流;
- 台风;
- 对称不稳定;
- Wave-CISK过程
Abstract: After No.9216 typhoon landed, it moved to the right entrance of the southwesterly jet at the 200 hPa level. A mesoscale rainstorm was generated and developed in the area far from the typhoon center. By using a 2-layer model, the process is analyzed and the positive feedback mechanism of the mesoscale storm rainfall with the coupling of low-level and upper-level jets and the typhoon circulation is studied. The results indicate that the Wave-CISK process and the symmetric instability of the baroclinic basic flow are the reasonable dynamic causes of the development of the low-level jet and the generation of the inverted trough. The baroclinic atmosphere with convective instability is advantageous to the development of instability of northward inertial gravity waves.-
Key words:
- Jet;
- Typhoon;
- Symmetric instability;
- Wave-CISK
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图 1 8月31日20:00 200 hPa、850 hPa (a) 高度场与急流 (b) 风速
(图a中, 虚矢线:850 hPa急流; 实矢线:200 hPa急流; 实线:200 hPa高度场; 虚线:850 hPa高度场; 双虚线:850 hPa倒槽; 图b中, 实线:850 hPa场; 虚线:200 hPa场.单位:m/s)
图 3 8月31日20:00动力变压
(实矢线:31日20:00 200 hPa高空急流轴; 虚矢线:30日20:00 200 hPa高空急流; 实线:台风移动变压; 虚线:动力变压.单位:hPa)
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