| 中国西部积雪的2—3周振荡及其对大气环流异常的影响 |
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| 引用本文： | 刘晓东,韦志刚.中国西部积雪的2—3周振荡及其对大气环流异常的影响[J].高原气象,1993,12(4):418-424. |
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| 作者姓名： | 刘晓东 韦志刚 |
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| 作者单位： | 中国科学院兰州高原大气物理研究所，中国科学院兰州高原大气物理研究所，兰州干旱气象研究所，中国科学院兰州高原大气物理研究所 甘肃省 兰州市730000，甘肃省 兰州市730000，甘肃省 兰州市730000 |
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| 基金项目： | 中科院重大科研项目KY85-10-2，国家基础研究重大关键项目“气候动力学和气候预测理论的研究”资助 |
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| 摘 要： | 本文能过对美国宇航局Ｎｉｍｂｕｓ－７卫星观测的１９７９－１９８６年中国西部积雪资料的分析发现，２－３周的低频振荡现象普遍存在并与大气环流异常密切相关；大气环流对半年积雪２－３周的低频振荡有着明显的线性响应；冬半年积雪的这种低频振荡能激发出北半球５００ｈＰａ高度场准定常Ｒｏｓｓｂｙ波，并通过二维的Ｒｏｓｓｂｙ波能量频散而影响到北美。
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| 关 键 词： | 大气环流异常 积雪 影响 低频振荡 |
2-3 WEEKS OSCILLATION OF SNOW COVER IN WESTERN CHINA AND ITS INFLUENCE ON ATMOSPHERIC CIRCULATION ANOMALIES OVER NORTHERN HEMISPHERE |
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| Liu Xiaodong Wei Zhigang Chen Baode Jin Jiming.2-3 WEEKS OSCILLATION OF SNOW COVER IN WESTERN CHINA AND ITS INFLUENCE ON ATMOSPHERIC CIRCULATION ANOMALIES OVER NORTHERN HEMISPHERE[J].Plateau Meteorology,1993,12(4):418-424. |
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| Authors: | Liu Xiaodong Wei Zhigang Chen Baode Jin Jiming |
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| Abstract: | In this paper, analysis of snow cover data during 1979-1986 in western China which were derived by NASA from SMMR show: (1) 2-3 weeks oscillation exists widely in the 8 years. (2) The oscillation is closely associated with atmospheric circulation anomalies and the linear responses of general circulation to the 2-3 weeks oscillation are very clear in winter. (3) The 2-3 weeks oscillation of snow cover in western China can motivate quasi-permanent Rossby waves at 500 hPa geopotential height field over northern hemisphere and affect atmosphere over North America by energy dispersion of two-dimensional Rossby waves. |
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| Keywords: | Atmospheric circulation anomaly Snow cover in western China 2-3 weeks oscillation |
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