The Relationship between Autumn- time Eur asian Snow Cover and Winter - time NH Cir culation
Received date: 2007-04-10
Revised date: 2007-05-20
Online published: 2007-07-25
Supported by
Project of Jiangsu Key Laboratory of Meteorological Disaster No.KLME050205; National Natural Science Foundation of China.No.40405018; No.40331010
The relationship between the autumn-time and winter-time Eurasian snow cover anomalies and the distributions of winter-time NH circulation has been investigated by using comparative analysis of the correlation and synthetic methods based on the data of the snow cover in Eurasia from NOAA and reanalyzed data from NCEP/NCAR for the period 1973 through 2004, and the results show an observational fact: there is a significant correlation between the Eurasian autumn snow cover and the high-latitude atmospheric circulation of late winter in Northern Hemisphere. Especially it shows an obvious negative correlation between the Eurasian autumn snow cover and the main model Arctic Oscillation (AO), or the North Atlantic Oscillation (NAO) of the winter-time NH circulation. The relationship between the autumn-time snow cover anomalies and the following winter-time circulation is closer than that between the winter-time snow cover anomalies and the winter-time circulation based on observational analysis. Finally, a link between the Eurasian autumn snow cover and the winter-time NH circulation is mentioned. The Eurasian autumn snow cover may be a major factor which forces the variability of the following winter-time NH circulation.
ZHANG Tianyu, CHEN Haishan, SUN Zhaobo . The Relationship between Autumn- time Eur asian Snow Cover and Winter - time NH Cir culation[J]. Acta Geographica Sinica, 2007 , 62(7) : 728 -741 . DOI: 10.11821/xb200707006
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