| “4.28”青藏高原气旋产生沙尘暴、 冰雹天气系统结构分析 |
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| 引用本文： | 冯军,尚学军,樊明.“4.28”青藏高原气旋产生沙尘暴、 冰雹天气系统结构分析[J].高原气象,2009,28(5):1051-1057. |
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| 作者姓名： | 冯军 尚学军 樊明 |
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| 作者单位： | 甘肃省陇南市气象局,甘肃,武都,746000 |
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| 摘 要： | 青藏高原气旋造成的多种天气现象可引起沙尘暴、 冰雹天气过程\.在2007年4月27日20:00~29日00:00历时32 h的高原气旋造成甘肃民勤出现沙尘暴, 陇南出现雷阵雨天气, 西和县出现冰雹天气\.该气旋持续时间长， 影响范围大\.本文分析了此次青藏高原气旋的形成过程, 即冷锋的形成完成气旋的波动； 在北切南槽贯通、 连接的过程中， 伴有正涡度平流的短波槽围绕主高空槽移动， 形成了气旋的辐合中心， 槽区两侧温度差异形成两支冷暖输送带， 锋面过境处为地面最大风速区， 是气旋的生成阶段。气旋生成后， 在气旋前部， 低层低湿、 辐合上升， 高层的动量沿锋面下传， 出现沙尘暴； 锋面锢囚时冷空气在槽区堆积形成凝结核， 在陇南造成强对流天气， 形成冰雹。
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| 关 键 词： | 高原气旋 沙尘暴、 冰雹天气 结构分析 |
Synthetical Analysis on Sandstorm and Hail Weather Caused by "4.28" Qinghai-Xizang Plateau Cyclone |
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| FENG Jun,SHANG Xue-jun,FAN Ming.Synthetical Analysis on Sandstorm and Hail Weather Caused by "4.28" Qinghai-Xizang Plateau Cyclone[J].Plateau Meteorology,2009,28(5):1051-1057. |
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| Authors: | FENG Jun SHANG Xue-jun FAN Ming |
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| Abstract: | The various weather phenomena due to Qinghai-Xizang Plateau cyclone can cause complex mechanism of sandstorm and hail weather process. Plateau cyclone caused the sandstrom in Minqin country and thunder shower hail in Xihe county in south Gansu from 20:00 on 27 to 00:00 on 29 April 2007, lasted 32 hours that continued long time and hitted large area. The Qinghai-Xizang Plateau cyclone forming process are analyised： Namely the cold front formation complets the cyclone the fluctuation; in the north shear wave and south trough linking and connection process, the short wave trough of accompanying the positive vorticity advection move round the main upper trogh, the cyclone convergence center is formed, and temperature contrast on both sides of trough area oppear cold and warm transportation belts, front surface passing point is the maximun wind speed area, which is the generation stage of the cyclone. After the cyclone generating, the lower is damp, eddying and moving up, the high-level momentum along frontal area downlading in cyclone forehead, which causes the sandstorm. The cold air in trough formed condensation nucleus when the front surface occluded, it caused the severe convection weather to form hail in South Gansu. |
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| Keywords: | Qinghai-Xizang Plateau cyclone Sandstorm Hail weather Structure analysis |
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