| 一次引发强沙尘天气的快速发展蒙古气旋的诊断分析 |
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| 引用本文： | 张志刚,赵琳娜,矫梅燕,周宁芳,孔期.一次引发强沙尘天气的快速发展蒙古气旋的诊断分析[J].气象,2007,33(5):27-35. |
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| 作者姓名： | 张志刚 赵琳娜 矫梅燕 周宁芳 孔期 |
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| 作者单位： | 国家气象中心,北京,100081 |
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| 基金项目： | 科技部科研院所社会公益研究专项基金;中国气象局科技攻关项目 |
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| 摘 要： | 利用NCEP分析资料和常规气象观测资料对造成2006年3月9-10日华北大范围强沙尘天气,产生大风的蒙古气旋快速发展过程进行了分析。结果表明：气旋发展前期,高层反气旋性流场对波能量发展有正的贡献,有利于气旋的爆发性发展。在气旋发展过程中,温度平流和涡度平流均为气旋发展的主要因子,但涡度平流在气旋发展初期相对温度平流较弱。斜压作用出现在低层,并随着气旋后部的锋消作用以及前部的锋生而显著增强,这对于有效位能的释放、动能的产生以及气旋的发展有重要作用,同时,斜压强迫能够诱发出强烈的非地转风。此外,位涡分析表明,气旋的发展与冷空气活动的关系比较密切,并且存在明显的高低空系统之间的相互作用,而水汽和潜热释放产生的作用不明显。同时揭示出该气旋发生发展机制不但与挪威学派的温带气旋模型有较大差别,而且与Petterssen总结的A、B类气旋、引起我国夏半年降水的江淮气旋和西南涡等低压系统亦不相同。
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| 关 键 词： | 沙尘暴 蒙古气旋 大风天气 斜压作用 |
| 收稿时间： | 2007/1/15 0:00:00 |
| 修稿时间： | 2007-01-152007-03-25 |
Diagnostic Analysis of a Rapid Developing Cyclone in Mongolia Causing Severe Sandstorm |
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| Zhang Zhigang,Zhao Linn,Jiao Meiyan,Zhou Ningfang and Kong Qi.Diagnostic Analysis of a Rapid Developing Cyclone in Mongolia Causing Severe Sandstorm[J].Meteorological Monthly,2007,33(5):27-35. |
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| Authors: | Zhang Zhigang Zhao Linn Jiao Meiyan Zhou Ningfang and Kong Qi |
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| Institution: | National Meteorological Center, CMA, Beijing 100081 |
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| Abstract: | Based on the NCEP-NCAR data and the observational data on March 9-10, 2006, a diagnostic analysis is conducted for the development of Mongolia cyclone inducing the severe dust storm. The results show that high-level anticyclonic flows contribute to development of the wave energy, and make the explosive cyclone. Although vorticity advection and thermal advection are important to the cyclone development, vorticity advection is weaker than thermal advection at the first stage of cyclone development. The baroclinicity in the lower troposphere strengthens signifi- cantly with frontolysis at the rear part of the cyclone and the frontogenesis of foreside the cyclone, which is helpful for release of available potential energy, production of kinetic energy and the development of the cyclone. In addition, the potential vorticity analysis indicates that the cyclone development is related to the activities of cold air, and there exist distinct interactions between systems of the upper and lower troposphere, but the role of water vapour and release of potential heat is not obvious. The mechanism of development of cyclone is quite different from that of other cyclones associated with the summer precipitation in China. |
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| Keywords: | dust storm Mongolia cyclone gale baroclinic effect |
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