| 冬季西伯利亚高压变化特征及其与中国气温的关系 |
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| 引用本文： | 侯亚红,杨修群,李刚.冬季西伯利亚高压变化特征及其与中国气温的关系[J].气象科技,2007,35(5):646-650. |
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| 作者姓名： | 侯亚红 杨修群 李刚 |
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| 作者单位： | 1. 辽宁省气象局,沈阳,110001
2. 南京大学大气科学系,南京,210008 |
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| 摘 要： | 客观地定义了表征西伯利亚高压位置和强度变化的4个指数,系统地分析了西伯利亚高压变化特征,并讨论了西伯利亚高压对我国冬季气温异常的影响。结果表明:西伯利亚高压具有明显的年际变化和年代际变化。在年代际尺度上,西伯利亚高压表现出随着时间变化先减弱、缩小,后增强、加大的趋势,位置变化趋势是先西撤、后东进,1999年后又西撤。其面积、强度和中心纬度异常与我国冬季气温关系密切,而经度异常变化对我国冬季气温异常变化影响不大。当冬季西伯利亚高压面积、强度异常大的时候,我国冬季气温异常主要表现为西南地区温度偏高,其它地区尤其是东北南部、新疆北部和华南部分地区温度偏低。
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| 关 键 词： | 西伯利亚高压 异常变化 指数 冬季气温 |
| 收稿时间： | 2006/9/20 0:00:00 |
| 修稿时间： | 2006-09-20 |
Variation Features of Siberian High and Relation with Winter Temperature in China |
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| Hou Yahong,Yang Xiuqun and Li Gang.Variation Features of Siberian High and Relation with Winter Temperature in China[J].Meteorological Science and Technology,2007,35(5):646-650. |
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| Authors: | Hou Yahong Yang Xiuqun and Li Gang |
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| Institution: | 1 .Liaoning Provincial Meteorological Bureau, Shenyang 110001; 2. Department of Atmospheric Sciences, Nanjing University, Nanjing 210008 |
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| Abstract: | Four indexes are defined to describe the position and intensity characteristics of Siberian High(SH) based on the NCEP/NCAR monthly mean data from 1948 to 2005.By analyzing the indexes,the features of the SH's normal and anomaly variations are examined.The findings conclude that SH indexes have obvious interannual and interdecadal variations;at the interdecadal scale,SH has the trend of decreasing/diminishing with time at first,then increasing/expading;as for position variation,SH moved at first toward west,then east,and west again after 1999;the area,intensity,and central latitudes anomalies of SH are closely related to winter temperature;and the SH longitude anomaly has little effect on winter temperature anomalies.The SH abnormal area is correlated with major winter temperature anomalies at the decadal time scale.When the SH area and intensity increase abnormally,there occurs abnormal winter temperature in China,increasing in Southweast China and decreasing in the other parts of China,especially in the southern Northeast,nothern Xingjiang,and a part of Sounth China. |
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| Keywords: | Siberian high anomaly variation index winter temperature |
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