摘要
主要应用EOF方法和相关、合成、小波等分析方法,初步分析了冬季欧亚大陆北部区域地面热力变化特征和西伯利亚高压(SH)的相互联系,结果表明:冬季欧亚大陆北部与南部不同区域间存在反向的热力差异,其中北部区域变化最为强烈,其地面气温存在2～4 a为周期的年际振荡和准10 a为周期的年代际变化特征。SH与欧亚大陆北部区域热力变化有着紧密联系,当SH位置偏南(北),则该区域地面温度偏高(低),即SH平均纬度位置南北移动1.0°时,该区域的平均气温就变化0.65℃。进一步分析表明欧亚大陆北部区域热力异常和SH中心纬度位置的南北摆动与中高纬度环流经向度异常所激发的冷、暖平流的活动有密切联系。
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.
出处
《气象科学》
CSCD
北大核心
2012年第5期542-549,共8页
Journal of the Meteorological Sciences
基金
国家自然科学基金资助项目(40675045
41065004)
NSFC-云南联合基金资助项目(U0833602)
公益性行业(气象)科研专项(GYHY201206017)
