| 北京沙尘频次的年际变化及其全球环流背景分析 |
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| 引用本文： | 范可,王会军.北京沙尘频次的年际变化及其全球环流背景分析[J].地球物理学报,2006,49(4):1006-1006. |
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| 作者姓名： | 范可 王会军 |
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| 作者单位： | 1.中国科学院大气物理研究所竺可桢-南森国际研究中心NZC,北京 100029 2 云南大学大气科学系，昆明 650091 3 中国科学院研究生院，北京 100039 |
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| 基金项目： | 中国科学院知识创新工程主要方向性项目（KZCX3-SW-221）和国家自然科学基金项目（40125014,40475037）资助. |
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| 摘 要： | 本文采用相关和合成的分析方法，研究北京沙尘频次的年际变化及其冬、春季的全球环流背景.结果表明北京沙尘频次有年际变化的特点，并与全球范围内的环流异常相联系，特别是南、北半球的中高纬的环流异常.南半球环流异常与沙尘的联系在冬、春两季有很好的持续性和显著性，北半球中高纬环流异常与沙尘的联系冬季较春季显著.春季对流层高层的东亚西风急流增强能使低空的蒙古气旋加强和锋生，从而引起地面大风，为沙尘天气频次的增加提供动力条件.
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| 关 键 词： | 北京沙尘频次的年际变化 全球环流 西风急流 蒙古气旋 |
| 文章编号： | 0001-5733（2006）04-1014-09 |
| 收稿时间： | 2004-10-09 |
| 修稿时间： | 2004-10-092006-04-14 |
Interannual variability of dust weather frequency in Beijing and its global atmospheric circulation |
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| FAN Ke,WANG Hui-Jun.Interannual variability of dust weather frequency in Beijing and its global atmospheric circulation[J].Chinese Journal of Geophysics,2006,49(4):1006-1006. |
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| Authors: | FAN Ke WANG Hui-Jun |
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| Institution: | 1.Nansen Zhu International Research Center, Insititute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China 2 Department of Atmospheric Science, Yunnan University, Kunming 650091, China 3 Graduate School of the Chinese Academy of Sciences, Beijing 100039, China |
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| Abstract: | The interannual variability of dust weather frequency(DWF) in Beijing and its global atmospheric circulation are examined based on the correlation and composite analysis methods in this paper.The results indicate that interannual variability of DWF is dominated by the anomalous global atmospheric circulation.Especially the mid-high latitude anomalous atmospheric circulation in both hemispheres is very important for DWF in North China.The anomalous atmospheric circulation in the Southern Hemisphere(SH) related to DWF in Beijing in boreal winter has a good persistency and obviousness from the boreal winter to spring.Meanwhile,the anomalous circulation at mid-high latitudes in the Northern Hemisphere(NH) related to DWF in Beijing is much remarkable in boreal winter than that of in spring.The strong westerly jet in the upper troposphere is linked to the Mongolia cyclone and frontogenesis at low level which can cause strong wind and further provides the dynamic factor for the increased DWF in Beijing. |
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| Keywords: | DWF in Beijing Global atmospheric Circulation westerly jet Mongolia cyclone |
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