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Abstract
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
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Citation
CHEN Yang, ZHAI Panmao. 2011: Interannual to Decadal Variability of the Winter Aleutian LowIntensity During 1900–2004. Journal of Meteorological Research, 25(6): 710-724. DOI: 10.1007/s13351-011-0602-x
CHEN Yang, ZHAI Panmao. 2011: Interannual to Decadal Variability of the Winter Aleutian LowIntensity During 1900–2004. Journal of Meteorological Research, 25(6): 710-724. DOI: 10.1007/s13351-011-0602-x
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CHEN Yang, ZHAI Panmao. 2011: Interannual to Decadal Variability of the Winter Aleutian LowIntensity During 1900–2004. Journal of Meteorological Research, 25(6): 710-724. DOI: 10.1007/s13351-011-0602-x
CHEN Yang, ZHAI Panmao. 2011: Interannual to Decadal Variability of the Winter Aleutian LowIntensity During 1900–2004. Journal of Meteorological Research, 25(6): 710-724. DOI: 10.1007/s13351-011-0602-x
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