| 甘肃夏季特强沙尘暴分析 |
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| 引用本文： | 王锡稳,黄玉霞,刘治国,魏锋,张铁军.甘肃夏季特强沙尘暴分析[J].气象科技,2007,35(5):681-686. |
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| 作者姓名： | 王锡稳 黄玉霞 刘治国 魏锋 张铁军 |
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| 作者单位： | 1. 兰州中心气象台,兰州,730020
2. 定西市气象局,定西,743000 |
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| 基金项目： | 国家自然科学基金;兰州中心气象台创新基金 |
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| 摘 要： | 夏季沙尘暴的气候特征表明,夏季是甘肃省沙尘暴的次多发季节,主要集中在民勤、鼎新、金塔。通过对一次罕见的甘肃省夏季强沙尘暴天气分析发现:高空小槽、切变线、热低压是引发夏季沙尘暴的主要天气系统,而春季沙尘暴一般是大尺度天气系统造成的;夏季沙尘暴发生前期高空急流反映并不明显,急流风速的突然加大和沙尘暴几乎同时发生,这是夏季沙尘暴预报的难点之一;沙尘暴发生前8~12 h的螺旋度场对沙尘暴预报有较好的指示意义,正值越大,沙尘暴越强,但当沙尘暴与强降水同时发生时,沙尘暴区螺旋度值明显小于强降水中心螺旋度值。
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| 关 键 词： | 夏季强沙尘暴 气候特征 螺旋度 |
| 收稿时间： | 2006/7/13 0:00:00 |
| 修稿时间： | 2006-07-132006-11-19 |
Analysis of Summer Severe Sand Dust Storms in Gansu Province |
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| Wang Xiwen,Huang Yuxi,Liu Zhiguo,Wei Feng and Zhang Tiejun.Analysis of Summer Severe Sand Dust Storms in Gansu Province[J].Meteorological Science and Technology,2007,35(5):681-686. |
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| Authors: | Wang Xiwen Huang Yuxi Liu Zhiguo Wei Feng and Zhang Tiejun |
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| Institution: | 1 Lanzhou Central Meteorological Office, Lanzhou 730020; 2 Dingxi Meteorological Bureau, Gansu Province, Dingxi 743000 |
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| Abstract: | Sand-dust storms in Gansu Province occurred most frequently in summer. The summer sand-dust storms concentrated around Minqin,Dingxin and Jinta.The weather patterns for severe sand-dust storms in summer in Gansu Province are analyzed.The results show that upper troughs and shear lines and hot lows are main synoptic systems that result in summer sand-dust storms.Spring sand-dust storms are mostly induced by large-scale synoptic systems.Before the occurrence of summer sand-dust storms,the upper-level jet currents are not apparent.The sudden wind speed increase of the jet stream happens almost at the same time with a sand-dust storm,and that is one of difficulties in summer sand-dust storm prediction.The helicity field 8 to 12 hours before sand-dust storm occurring is a good indicator in forecasting sand-dust storms.The larger the helicity is,the severer the sand-dust storm is.But when a sand-dust storm and severe precipitation occur concurrently,the value of helicity in the sand-dust storm region is obviously less than that in the severe precipitation region. |
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| Keywords: | summer severe sand-dust storm climate characteristic helicity |
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