Telecorrelation of the 500 hPa Polar Circulation and El Nino / SO with the Temperature Fields in China

Shi Neng; Luo Boliang

doi:10.1007/BF02919611

Impact Factor: 5.8

Volume 8 Issue 3

Jul. 1991

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 1991 > 8(3): 289-298

Telecorrelation of the 500 hPa Polar Circulation and El Nino / SO with the Temperature Fields in China

1.
Nanjing Institute of Meteorology, Nanjing 210044,Meteorological Observatory of Hunan Province

doi: 10.1007/BF02919611

Abstract
References
Related papers
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Abstract:
By using the monthly data from 1951 through 1984, empirical orthogonal expansion is performed for the 500 hPa geopotential height north of 65oN and the canonical fields are clustered by fuzzy classification. It is noted that both the mean monthly polar vortex fields and the large-scale anomaly fields fall into three regimes, with those of the January mean field and the April anomaly field having characteristic features. In addition, the relationship between the time weigthing coefficients of the canonical fields and El Nino / SO is examined, showing significant anomalies in the large-scale polar anomaly fields during April and October of the year when El Nino occurs. These polar circulation anomalies have considerably influenced the temperature fields in China during April and October. Thus, we may con-clude that this is one of the most important reasons for a relatively cool April and a warm October in China during the El Nino year.
References

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[2]	Chen Wanlong, Chu Pao-Shin, 1990: On the Couplings between Chebyshev Coefficients as Derived from the Monthly Mean Geopotential Fields at 500 hPa over East Asia and the Southern Oscillation, ADVANCES IN ATMOSPHERIC SCIENCES, 7, 347-353. doi: 10.1007/BF03179766
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Manuscript History

Manuscript received: 10 July 1991

Manuscript revised: 10 July 1991

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Telecorrelation of the 500 hPa Polar Circulation and El Nino / SO with the Temperature Fields in China

1. Nanjing Institute of Meteorology, Nanjing 210044,Meteorological Observatory of Hunan Province

Manuscript received: 1991-07-10
Manuscript revised: 1991-07-10

Abstract: By using the monthly data from 1951 through 1984, empirical orthogonal expansion is performed for the 500 hPa geopotential height north of 65oN and the canonical fields are clustered by fuzzy classification. It is noted that both the mean monthly polar vortex fields and the large-scale anomaly fields fall into three regimes, with those of the January mean field and the April anomaly field having characteristic features. In addition, the relationship between the time weigthing coefficients of the canonical fields and El Nino / SO is examined, showing significant anomalies in the large-scale polar anomaly fields during April and October of the year when El Nino occurs. These polar circulation anomalies have considerably influenced the temperature fields in China during April and October. Thus, we may con-clude that this is one of the most important reasons for a relatively cool April and a warm October in China during the El Nino year.