| 2004/2005年冬季强寒潮事件的等熵位涡分析 |
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| 引用本文： | 丁一汇,马晓青.2004/2005年冬季强寒潮事件的等熵位涡分析[J].气象学报,2007,65(5):695-707. |
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| 作者姓名： | 丁一汇 马晓青 |
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| 作者单位： | 1. 气候研究开放实验室,北京,100081;国家气候中心,北京,100081
2. 国家气候中心,北京,100081;北京市气象局,北京,100089 |
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| 基金项目： | 国家重点基础研究发展计划亚印太交汇区海气相互作用及其对我国短期气候影响课题四 |
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| 摘 要： | 利用2004年12月1日—2005年2月28日的NCAR/NCEP逐日再分析资料,对2004年12月22日—2005年1月1日的强寒潮事件进行等熵位涡分析。结果表明:这次强寒潮事件的强冷空气来自欧亚北部和北极地区的高纬平流层下部与对流层上部。在寒潮爆发前期,高位涡强冷空气传播到贝加尔湖南侧,并被来自低纬度的低位涡空气所切断,在欧亚地区形成北部低位涡(阻塞高压)南部高位涡(低涡)的偶极型环流。随着低位涡的减弱消亡,高位涡强冷空气沿高原北侧向东南方向移动,当高位涡中心移到中国东部地区,高位涡空气柱在垂直方向上强烈向下伸展,使得气柱的气旋性涡度加强,东亚大槽迅速加深,引起寒潮的爆发。进一步分析表明,高位涡中心向南、向下传播过程中,等熵面上高位涡中心附近气流在其西侧和北侧地区沿等熵面下沉,引起上述地区低层西伯利亚高压迅速发展,导致强寒潮爆发。
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| 关 键 词： | 寒潮 位涡 等熵面 东亚大槽 西伯利亚高压 |
| 收稿时间： | 7/9/2007 12:00:00 AM |
| 修稿时间： | 2007年7月9日 |
ANALYSIS OF ISENTROPIC POTENTIAL VORTICITY FOR A STRONG COLD WAVE IN 2004/2005 WINTER |
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| Ding Yihui and Ma Xiaoqing.ANALYSIS OF ISENTROPIC POTENTIAL VORTICITY FOR A STRONG COLD WAVE IN 2004/2005 WINTER[J].Acta Meteorologica Sinica,2007,65(5):695-707. |
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| Authors: | Ding Yihui and Ma Xiaoqing |
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| Institution: | Key Laboratory of Climate Change Research,Beijing,100081;National Climate Center of China,CMA,Beijing,100081;National Climate Center of China,CMA,Beijing,100081;Beijing Meteorological Bureau,Beijing,100089 |
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| Abstract: | Using the NCAR/NCEP daily reanalysis data from 1 Dec 2004 to 28 Feb 2005,the isentropic potential vorticity(IPV) analysis of a strong countrywide cold wave from 22 Dec 2004 to 1 Jan 2005 was performed.It is found that the strong cold air of the cold wave originated from the lower-stratosphere and upper-troposphere of the high latitude in the Eurasian continent and the Arctic area.Before the outbreak of the cold wave,the strong cold air of high PV propagated down to the south of Lake Baikal,and was cut off by the low PV air of low latitude origin,forming a dipole-type circulation pattern with the low PV center(blocking high) in the northern part of the Eurasian continent and the high PV one(low vortex) in the southern part.Along with the decaying of the low PV center,the high PV center(strong cold air) moved towards the southeast along the north flank of the Tibetan Plateau.When arrived East China,the air column of high PV rapidly stretched downwards,leading to increase in its cyclonic vorticity,which made the East Asian Trough deepened rapidly,and finally induced the outbreak of the countrywide cold wave.Further analysis indicates that in the southward and downward propagation process of the high PV air,the air flow west and north of the high PV center on isentropic surface subsided along the isentropic surface,resulting in rapidly development of Siberian high finally leading to the southward outbreak of the strong cold wave. |
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| Keywords: | Cold wave Potential vorticity Isentropic surface Sibrian high East Asian trough |
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