| 对华北一次特大台风暴雨过程的位涡诊断分析 |
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| 引用本文： | 于玉斌,姚秀萍.对华北一次特大台风暴雨过程的位涡诊断分析[J].高原气象,2000,19(1):111-120. |
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| 作者姓名： | 于玉斌 姚秀萍 |
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| 作者单位： | 北京气象学院,北京,100081 |
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| 基金项目： | 中国气象局青年气象科学基金，， |
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| 摘 要： | 通过对９６０８号台风低压及其外围暴雨位和等熵面上物理量场的分析，揭示了台风低压北上诱发暴雨过程的位涡场的结构及冷空气对暴雨增幅的作用，给出此次暴雨增幅过程的图像。分析表明：对流层低层中高纬度冷空气（高位涡）扩散南下在台风低压环流区附近的“侵入”作用是此次特大暴雨过程的最重要的原因之一；等熵面位涡的分析进一步说明了中高纬地区冷空气的活动状况；对流层高层或平流层低层位涡的下传有利于位势不稳定能量的释放
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| 关 键 词： | 台风 低压 暴雨增幅 位涡 冷空气 暴雨过程 |
| 修稿时间： | 1998-10-12 |
THE DIAGNOSIS ANALYSIS OF POTENTIAL VORTICITY FOR A SEVERE TYPHOON RAINSTORM IN NORTH CHINA |
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| YU Yu-bin,YAO Xiu-ping.THE DIAGNOSIS ANALYSIS OF POTENTIAL VORTICITY FOR A SEVERE TYPHOON RAINSTORM IN NORTH CHINA[J].Plateau Meteorology,2000,19(1):111-120. |
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| Authors: | YU Yu-bin YAO Xiu-ping |
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| Abstract: | Based on the analysis of
potential vorticity (PV) and elements on isentropic surface about the typhoon 9608 and its
heavy rain outside, the study is to show the PV structure and the interaction with
midlatitude weather systems. It shows the feature of severe rainstorm dynamic and
thermodynamic process. A picture about the process of heavy rain amplification is given.
It is also shown that one of the most important reasons of the heavy rain amplification is
the cold air (high PV region) which spreads to south from midlatitude in the lower
troposphere and transports into the typhoon low pressure. The study of PV on isentropic
surface shows the active state of the midlatitude cold air. The tropopause folding, which
means that high PV spreads downward from the upper troposphere or stratosphere, helps the
releasing of potential instability energy and the development of rainstorm. It also
indicated that the rainstorm region lies in the northeast part of high PV center on the
lower isentropic surface, corresponding to the maximum negative region of the PV
baroclinic part, and supplies an important reference for forecasting the intensity and the
region of the typhoon heavy rain. |
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| Keywords: | Typhoon low pressure Heavy rain amplification Isentropic surface Potential vorticity Cold air |
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