An Observational Study of the 30-50 Day Atmospheric Oscillations Part I: Structure and Propagation

Li Chongyin; Wu Peili

doi:10.1007/BF03179762

Impact Factor: 5.8

Volume 7 Issue 3

Jul. 1990

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Article > ADVANCES IN ATMOSPHERIC SCIENCES > 1990 > 7(3): 294-304

An Observational Study of the 30-50 Day Atmospheric Oscillations Part I: Structure and Propagation

1.
LASG, Institute of Atmospheric Physics Academia Sinica, Beijing 100080,Space and Atmospheric Physics Group, Department of Physics, Imperial College, London SW7 2BZ

doi: 10.1007/BF03179762

Abstract
References
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Abstract:
Features of structure and propagation of the 30 to 50 day atmospheric oscillations are investigated using the ECMWF analysis of 1980-1983. Evidence is provided to confirm the characteristics of the oscillation in the equatori-al region. Those in the mid-high latitudes, however, are revealed to be very different from the tropics and pose a strong barotropic structure. Horizontal coherence shows teleconnection patterns which can be identified as EAP and PNA. The wind field of the specified time scale of the oscillation appears as long-lived vortices and vortex pairs. Mid-latitude perturbations propagate clearly westwards, especially during the winter season. In the high latitudes, they propagate westwards in the winter but eastwards in the summer. Meridional propagations are rather different from region to region.
References

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Manuscript History

Manuscript received: 10 July 1990

Manuscript revised: 10 July 1990

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

An Observational Study of the 30-50 Day Atmospheric Oscillations Part I: Structure and Propagation

1. LASG, Institute of Atmospheric Physics Academia Sinica, Beijing 100080,Space and Atmospheric Physics Group, Department of Physics, Imperial College, London SW7 2BZ

Manuscript received: 1990-07-10
Manuscript revised: 1990-07-10

Abstract: Features of structure and propagation of the 30 to 50 day atmospheric oscillations are investigated using the ECMWF analysis of 1980-1983. Evidence is provided to confirm the characteristics of the oscillation in the equatori-al region. Those in the mid-high latitudes, however, are revealed to be very different from the tropics and pose a strong barotropic structure. Horizontal coherence shows teleconnection patterns which can be identified as EAP and PNA. The wind field of the specified time scale of the oscillation appears as long-lived vortices and vortex pairs. Mid-latitude perturbations propagate clearly westwards, especially during the winter season. In the high latitudes, they propagate westwards in the winter but eastwards in the summer. Meridional propagations are rather different from region to region.