Seasonality of the Interaction between Convection over the Western Pacific and General Circulation in the Northern Hemisphere

Hu Zengzhen; Tsuyoshi Nitta

doi:10.1007/s00376-997-0072-3

Impact Factor: 5.8

Volume 14 Issue 4

Oct. 1997

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 1997 > 14(4): 541-553

Seasonality of the Interaction between Convection over the Western Pacific and General Circulation in the Northern Hemisphere

1.
LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100080,CCSR, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153, Japan

doi: 10.1007/s00376-997-0072-3

Abstract
References
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Abstract:
The seasonality of the interaction between convection over the western Pacific and general circulation in the Northern Hemisphere (NH) is analyzed in the present paper with singular value decomposition (SVD) and empirical orthogonal function (EOF) analysis approaches, based on 500 hPa monthly mean geopotential height data and high-cloud amount data. The analyses demonstrate that coupled dominant patterns in the interaction between the convection over the western Pacific and the general circulation in NH are different in various seasons. In spring, the convection over the western Pacific is closely related with the western Atlantic (WA) and North Pacific (NP) like patterns of the general circulation in NH, and some associations between the WA and NP like pat?terns and the El Ni?o / Southern Oscillation (ENSO) cycle are also existed. The Pacific Japan (PJ) pattern is the dom?inant pattern in the interaction between the interannual variabilities of the convection over the western Pacific and the general circulation in NH summer. The WA like pattern and 3-4 year period oscillation are also relatively obvious for the summer case. In autumn, the convection over the western Pacific is closely linked with the Eurasian (EU) like pattern and the Atlantic oscillation in the general circulation in NH, it is suggested that in autumn the vitiation of convective activity over the western Pacific is largely affected by the general circulation anomaly (cold air from high latitudes) through EU like teleconnection pattern. Abrupt change happened by the end of 1980’s in the autumn interaction. The strong interaction between the western Pacific (WP) and EU like patterns in the general circulation in NH and the convection over the western Pacific and a linear trend of increasing of this interaction are also suggested in winter. It is also demonstrated that the interaction in summer and winter is stronger than in the transition seasons (spring and autumn).
- Seasonality,
- Interaction,
- Convection over the western Pacific,
- General circulation in the Northern Hemisphere
References

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Manuscript History

Manuscript received: 10 October 1997

Manuscript revised: 10 October 1997

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

Seasonality of the Interaction between Convection over the Western Pacific and General Circulation in the Northern Hemisphere

1. LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100080,CCSR, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153, Japan

Manuscript received: 1997-10-10
Manuscript revised: 1997-10-10

Abstract: The seasonality of the interaction between convection over the western Pacific and general circulation in the Northern Hemisphere (NH) is analyzed in the present paper with singular value decomposition (SVD) and empirical orthogonal function (EOF) analysis approaches, based on 500 hPa monthly mean geopotential height data and high-cloud amount data. The analyses demonstrate that coupled dominant patterns in the interaction between the convection over the western Pacific and the general circulation in NH are different in various seasons. In spring, the convection over the western Pacific is closely related with the western Atlantic (WA) and North Pacific (NP) like patterns of the general circulation in NH, and some associations between the WA and NP like pat?terns and the El Ni?o / Southern Oscillation (ENSO) cycle are also existed. The Pacific Japan (PJ) pattern is the dom?inant pattern in the interaction between the interannual variabilities of the convection over the western Pacific and the general circulation in NH summer. The WA like pattern and 3-4 year period oscillation are also relatively obvious for the summer case. In autumn, the convection over the western Pacific is closely linked with the Eurasian (EU) like pattern and the Atlantic oscillation in the general circulation in NH, it is suggested that in autumn the vitiation of convective activity over the western Pacific is largely affected by the general circulation anomaly (cold air from high latitudes) through EU like teleconnection pattern. Abrupt change happened by the end of 1980’s in the autumn interaction. The strong interaction between the western Pacific (WP) and EU like patterns in the general circulation in NH and the convection over the western Pacific and a linear trend of increasing of this interaction are also suggested in winter. It is also demonstrated that the interaction in summer and winter is stronger than in the transition seasons (spring and autumn).

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