ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 39 Issue 9 > 2013,39(9):1096-1102. DOI:10.7519/j.issn.1000-0526.2013.09.002 Prev Next
Abnormal Characteristics of Eurasian Teleconnection in Winter at Pentad Time Scale and Its Impact on the Weather in China
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Abstract:
Using the NCEP/NCAR global daily reanalysis data, this paper defined the winter pentad Eurasian teleconnection persistent anomaly, analyzed the characteristics of persistent abnormal process of EU pattern and discussed the corresponding atmospheric circulation and its impact on the winter weather in China. Statistical results show that: 26 persistent abnormal processes occur in the 54 winters of 1957-2010. The positive persistent abnormal processes mainly occur in December, the 2nd to the 5th pentad of January, and the 4th pentad of February to the 1st pentad of March while the negative ones occur in the 4th and 5th pentads of December, the first three pentads of January and the 3rd pentad of February to the 1st pentad of March. Then the 200 hPa and 850 hPa geopotential height fields are selected to represent high and low atmospheric layers. Synthetic analysis shows that: during the processes of index anomalies, characteristics of strong EU pattern exists in both of the high and low atmospheric layers; and temperature in most parts of China is influenced by EU index anomalies, showing significant difference. Precipitation presents significant difference in the middle and lower reaches of the Yellow River and Yangtze River, and parts of southeastern China. During positive abnormal processes, influenced by the strengthened Siberian high, northerly winds prevail in the lower troposphere over China with lower temperature and less rainfalls. The opposite situation tends to occur in negative processes.
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