Interannual to Decadal Variability of the Winter Aleutian Low Intensity During 1900-2004  

作　　者：陈阳 翟盘茂 

机构地区：[1]State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences CMA

出　　处：《Acta meteorologica Sinica》2011年第6期710-724,共15页

基　　金：Supported by the National Natural Science Fundation Key Project(90711003);China Meteorological Administration Special Public Welfare Research Fund(GYHY201106018)

摘　　要：A new winter Aleutian Low （AL） intensity index was defined in this paper. A centurial-long time series of this index was constructed using the sea level pressure （SLP） data of nearly 100 years. The features of interannual and decadal variability of the winter AL intensity since 1900 were analyzed by applying the wavelet analysis. The relationship between the winter AL intensity and atmospheric circulation was examined. The cross-wavelet analysis technique was used to further reveal the relationship between the AL intensity and sea surface temperature （SST） in the equatorial eastern Pacific （EEP） and tropical Indian Ocean （TIO） in winter. The results indicate that： 1） On the interannual timescale, the winter AL intensity displays 3 7-yr oscillations, while on the decadal timescale, 8-10-yr and 16 22-yr oscillations are more obvious. 2） Of the linkage to atmospheric circulation, both AO （Arctic Oscillation） and PNA （Pacific North America pattern） are closely associated with winter AL intensity on the interannual timescale, but only PNA contributes to the variation of winter AL intensity on the decadal timescale. 3） As to the ocean impact, winter EEP SST is a major factor affecting the winter AL intensity on the interannual timescale, especially on the 3 7-yr periods. However, on the decadal timescale, though both the TIO and EEP SSTs are associated with the AL intensity in winter, the TIO SST impact is more significant.A new winter Aleutian Low （AL） intensity index was defined in this paper. A centurial-long time series of this index was constructed using the sea level pressure （SLP） data of nearly 100 years. The features of interannual and decadal variability of the winter AL intensity since 1900 were analyzed by applying the wavelet analysis. The relationship between the winter AL intensity and atmospheric circulation was examined. The cross-wavelet analysis technique was used to further reveal the relationship between the AL intensity and sea surface temperature （SST） in the equatorial eastern Pacific （EEP） and tropical Indian Ocean （TIO） in winter. The results indicate that： 1） On the interannual timescale, the winter AL intensity displays 3 7-yr oscillations, while on the decadal timescale, 8-10-yr and 16 22-yr oscillations are more obvious. 2） Of the linkage to atmospheric circulation, both AO （Arctic Oscillation） and PNA （Pacific North America pattern） are closely associated with winter AL intensity on the interannual timescale, but only PNA contributes to the variation of winter AL intensity on the decadal timescale. 3） As to the ocean impact, winter EEP SST is a major factor affecting the winter AL intensity on the interannual timescale, especially on the 3 7-yr periods. However, on the decadal timescale, though both the TIO and EEP SSTs are associated with the AL intensity in winter, the TIO SST impact is more significant.

关 键 词：the Aleutian Low sea surface temperature cross-wavelet analysis VARIABILITY 

分 类 号：P467[天文地球—大气科学及气象学] U416.212[交通运输工程—道路与铁道工程]