西伯利亞高壓與冬季歐亞大陸熱力變化的關(guān)系

doi:10.3969/2012jms.0056

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西伯利亞高壓與冬季歐亞大陸熱力變化的關(guān)系
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                        10.3969/2012jms.0056
                    
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基金項目:國家自然科學基金資助項目(40675045,41065004);NSFC-云南聯(lián)合基金資助項目(U0833602);公益性行業(yè)(氣象)科研專項(GYHY201206017)

Relationship between wintertime thermal variation over the Eurasia and Siberian high

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摘要:

主要應(yīng)用EOF方法和相關(guān)、合成、小波等分析方法,初步分析了冬季歐亞大陸北部區(qū)域地面熱力變化特征和西伯利亞高壓(SH)的相互聯(lián)系,結(jié)果表明:冬季歐亞大陸北部與南部不同區(qū)域間存在反向的熱力差異,其中北部區(qū)域變化最為強烈,其地面氣溫存在2~4 a為周期的年際振蕩和準10 a為周期的年代際變化特征。SH與歐亞大陸北部區(qū)域熱力變化有著緊密聯(lián)系,當SH位置偏南(北),則該區(qū)域地面溫度偏高(低),即SH平均緯度位置南北移動1.0°時,該區(qū)域的平均氣溫就變化0.65 ℃。進一步分析表明歐亞大陸北部區(qū)域熱力異常和SH中心緯度位置的南北擺動與中高緯度環(huán)流經(jīng)向度異常所激發(fā)的冷、暖平流的活動有密切聯(lián)系。

Abstract:

Through the application of EOF and the methods of correlation, synthesis and wavelet analysis, the thermal variation characteristics over the northern Eurasia region in winter and the correlation between its variability and the Siberian High(SH) were mainly investigated. Results show that the thermal variation over northern Eurasia was contrary to that over the southern Eurasia, and the thermal variations in the northern region were very intensive. Through analysis we found that the thermal variation had a 2-4 a cycle in the inter-annual variations, and the inter-decadal variation had a significant quasi 10 a cycle also. SH and Eurasia thermal changes in northern area were closely linked, when SH position was southward(northward), the surface temperature was high (low) over the researched region, namely SH average latitude location shifted 1.0 to south or north when the average temperature changed 0.65 ℃ in the region. Further analysis showed that the northern thermal anomalies and the swinging of SH central location to north and south latitude were closely linked to the cold/warm advection activities inspired by the anomalous circulation over middle and high latitude.

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金燕,晏紅明,楊素雨,朱勇.西伯利亞高壓與冬季歐亞大陸熱力變化的關(guān)系.氣象科學,2012,32(5):542-549 JIN Yan, YAN Hongming, YANG Suyu, ZHU Yong. Relationship between wintertime thermal variation over the Eurasia and Siberian high. Journal of the Meteorological Sciences,2012,32(5):542-549

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收稿日期:2011-06-01
最后修改日期:2011-08-23
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在線發(fā)布日期: 2012-10-24
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