河西走廊中西部一次特强沙尘暴的对称不稳定诊断分析

J4 ›› 2007, Vol. 25 ›› Issue (4): 18-24.

河西走廊中西部一次特强沙尘暴的对称不稳定诊断分析

王伏村^{1, 2} ,付有智² ,刘秀兰³,殷雪莲² ,邵　亮⁴

1. 兰州大学大气科学学院,甘肃　兰州　730000; 2. 甘肃省张掖市气象局,甘肃　张掖　734000;3. 甘肃省临泽县气象局,甘肃　临泽　734200; 4. 兰州市气象局,甘肃　兰州　730020

收稿日期:2007-09-05 修回日期:2007-11-25 出版日期:2007-12-31 发布日期:2007-12-31
作者简介:王伏村(1969 - )男,甘肃临泽县人,工程师,主要从事天气预报及天气雷达应用研究
基金资助:
国家自然基金项目“新一代天气雷达测量沙尘暴的能力和方法研究”(40475011) ;兰州中心气象台创新基金“夏季沙尘暴预报方法研究”共同资助

In stability Analysis of a Heavy Dust Storm in Mid - west Part of Hex i Corr idor

WANG Fucun ^1，2, FU Youzhi² , L IU Xiulan ³, YIN Xuelian² , SHAO L iang⁴

1. College of A tm ospheric Sciences, Lanzhou University, Lanzhou 730000, China; 2. ZhangyeM eteorological Bureau of Gansu Province, Zhangye 734000, China; 3. L inzeM eteorological S tation of Gansu Province, L inze 734200, China;4. Lanzhou M eteorological B ureau of Gansu Province, Lanzhou 730020, China

Received:2007-09-05 Revised:2007-11-25 Online:2007-12-31 Published:2007-12-31

摘要/Abstract

摘要：

2007年4月13日在河西走廊中西部发生了特强沙尘暴,极大风速25 m / s,最小能见度50 m。用风云2号卫星红外云图对下沉急流云头进行跟踪,并用NCEP (1°×1°) 6 h再分析数据对高速下沉急流到达冷锋云带前后的静力不稳定、条件不稳定、条件对称不稳定等进行了诊断分析。结果表明:这次强沙尘暴由高速下沉急流引起,急流头部触发了锋区附近强对流发生;凝结潜热释放先在对流层中层发生,然后向下发展,使对流层中下部转为条件不稳定层, 700 hPa附近的条件不稳定能量释放使边界层对流环流迅速增强,引发了这次特强沙尘暴。

关键词: 特强沙尘暴, 下沉急流, 条件对称不稳定, 条件不稳定

　

Abstract:

Based on FY - 2 infrared images and the reanalysis data for six hours ofNCEP (1°×1°) , the heavy dust storm p rocess occurred on 13 Ap ril 2007 in the middle west part of Hexi corridor is analyzed, particularly the cloud head of the descending jet was tracked and the gravitational instability, conditional symmetric instability and conditional instability are diagnosed in detail. Results show that a high speed descending jet resulted in this heavy dust storm and the jet triggered strong convection in frontal region, and conditional instability occurred in themiddle part of troposphere first, then developed downwards. The release of conditional instability energy at the level of 700 hPa caused rap id development of convective circulation in boundary and brought on this heavy dust storm.

Key words: heavy dust storm, descending jet, conditional symmetric instability, conditional instability

中图分类号:

P425. 5 ⁺ 5

王伏村, 付有智, 刘秀兰, 殷雪莲, 邵　亮. 河西走廊中西部一次特强沙尘暴的对称不稳定诊断分析[J]. J4, 2007, 25(4): 18-24.

WANG Fu-Cun, FU Wei-Zhi, LIU Xiu-Lan, YAN Xue-Lian, SHAO 　Liang. In stability Analysis of a Heavy Dust Storm in Mid - west Part of Hex i Corr idor[J]. J4, 2007, 25(4): 18-24.

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