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| 非地转湿Q矢量在北上台风“桃芝”造成山东大暴雨中的应用 |
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高留喜1,2, 丛春华2, 李本亮3
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1.山东省气象科学研究所, 山东, 济南, 250031;2.山东省气象台, 山东, 济南, 250031;3.济南市气象台, 山东, 济南, 250000
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| 摘要: |
| 利用非地转湿Q矢量方法诊断分析了北上台风"桃芝"减弱后的低压造成的山东半岛2001年8月1日的大暴雨过程。结果表明:非地转湿Q矢量散度负值区与暴雨落区有很好的对应关系,低层925hPa非地转湿Q矢量散度对未来6～12h的强降水有较好的指示意义,明显优于常用的诊断物理量散度、水汽通量散度。925hPa层次增温、增湿明显,可能是非地转湿Q矢量在这次台风暴雨中925hPa层次比850hPa具有指示意义的部分原因。可见非地转湿Q矢量是预报山东暴雨的一种有效工具,在山东暴雨、大暴雨天气过程预报分析中具有较高的应用价值,为山东的暴雨预报提供了一个新的思路。 |
| 关键词: 非地转湿Q矢量 台风“桃芝” 暴雨 散度 |
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| 基金项目:山东省气象局课题(2006sdqxj10)项目;国家自然科学基金(40705017)项目;登陆热带气旋三维结构及其演变规律研究(2006STA01-8)项目共同资助 |
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| APPLICATION OF AGEOSTROPHIC WET Q-VECTOR IN TORRENTIAL RAINFALL OF TYPHOON "TORAJI" IN SHANDONG PROVINCE |
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GAO Liu-xi1,2, CONG Chun-hua2, LI Ben-liang3
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1.Meteorology Institute of Shandong, Ji'nan 250031, China;2.Shandong Meteorological Observatory, Ji'nan 250031, China;3.Ji'nan Meteorological Observatory, Ji'nan 250000, China
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| Abstract: |
| The ageostrophic wet Q-vector method is applied to diagnose a torrential rainfall process in Shandong Peninsula on August 1,2001,which is caused by a temperate cyclone transformed from typhoon "Toraji"moving northward. The results show that there is a good relation between the area of torrential rainfall and the negative area of divergence of ageostrophic wet Q-vector. By advance of 6～12 hours,the divergence of ageostrophic wet Q-vector at 925 hPa makes a good index to heavy rain in Shandong Province. The ageostrophic wet Q-vector method is a good tool for forecasting the heavy rain in the province. It can give a strong signal about the torrential rainfall area in advance,and using it to forecast torrential rain area is much better than using the field of divergence and the divergence of water vapor flux. It serves as a new good way to forecast torrential rainfall in the province. The increase of temperature and humidity is more obvious at 925 hPa than at 850 hPa,which may be partly one of the reasons why the divergence of ageostrophic wet Q-vector at 925 hPa is a good index in this torrential rainfall process. |
| Key words: ageostrophic wet Q-vector Typhoon Toraji torrential rainfall divergence |