| 2005年10月西藏高原特大暴雪成因分析 |
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| 引用本文： | 康志明,罗金秀,郭文华,杨克明.2005年10月西藏高原特大暴雪成因分析[J].气象,2007,33(8):60-67. |
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| 作者姓名： | 康志明 罗金秀 郭文华 杨克明 |
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| 作者单位： | 1. 国家气象中心,北京,100081
2. 西藏自治区气象台 |
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| 摘 要： | 利用常规观测资料、NCEP1°×1°的每6小时分析等资料,对2005年10月西藏高原特大暴雪(115.3mm)过程进行了天气动力学分析。结果表明:在西藏高原特定地形的作用下,山脊坡引起中低层气流下沉,抬升上升气流与高层冷空气形成不稳定大气层结、高层强辐散的抽吸效应对特大暴雪发生起了重要作用;特大暴雪的水汽源于孟加拉湾和南海,主要以两条通道输入西藏高原上空;高原上空Z-螺旋度"下正上负"垂直结构和湿位涡异常区均与强暴雪有密切的关系。
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| 关 键 词： | 特大暴雪 诊断分析 垂直环流 螺旋度 |
| 收稿时间： | 2007/2/12 0:00:00 |
| 修稿时间： | 2007-02-12 |
Causality Analysis of Snowstorm in Xizang Plateau in Autumn of 2005 |
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| Kang Zhiming,Luo Jinxiu,Guo Wenhua and Yang Keming.Causality Analysis of Snowstorm in Xizang Plateau in Autumn of 2005[J].Meteorological Monthly,2007,33(8):60-67. |
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| Authors: | Kang Zhiming Luo Jinxiu Guo Wenhua and Yang Keming |
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| Institution: | 1. National Meteorological Center, Beijing 100081; 2. Xizang Autonomous Region Observatory |
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| Abstract: | Based on the observation data and NCEP (1°×1°)6 h reanalysis data, the synop
tic dynamic analysis of the snowstorm process in Xizang Plateau in October 2005
was made. The result shows that several factors have play important roles in the
snowstorm process as follows: the instable atmospheric stratification fo
rmed by the co action of upward moist airflow and downward cold airflow at the
up level, the pumping effect of the divergence at upper level and the specific t
errain of Xizang Plateau. Bay of Bengal and South China sea are the sources of th
e vapor of the snowstorm. The vapor is transported to the Xizang Plateau throug
h two passages. The vertical profile of helicity, with positive and negative hel
icities respectively in the low and upper level over snowstorm area, and the exc
eptional area of moist potential vorticity are both closely related to the snows
torm. |
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| Keywords: | snowstorm diagnostic analysis vertical circulation helicity |
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