Unstable Tropical Air-Sea Interaction Waves and Their Physical Mechanisms

Zhang Renhe; Chao Jiping

doi:10.1007/BF02656954

Impact Factor: 5.8

Volume 10 Issue 1

Jan. 1993

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 1993 > 10(1): 61-70

Unstable Tropical Air-Sea Interaction Waves and Their Physical Mechanisms

1.
Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100080,National Research Center for Marine Environment Forecasts, State Oceanic Administration, Beijing 100081

doi: 10.1007/BF02656954

Abstract
References
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Abstract:
In this paper, the tropical air-sea interaction is discussed by using a simple air-sea coupled model, in which the inertia-gravity waves are filtered off and only the equatorial Rossby waves are reserved in both the atmosphere and the ocean. There exist two kinds of air-sea interaction waves in the coupled model, that is, the high-frequency fast waves and the low-frequency slow waves. The phase speed of the fast waves is westward and the frequencies are close to those of the equatorial Rossby waves in the atmosphere. The slow waves propagate westward in the part of short wavelengths and eastward in that of long wavelengths. There exist instabilities for both the westward and eastward propagating slow waves. If the fast waves are filtered off, there is little effect on the slow waves which have great in-fluence on the long range process in the tropical air-sea coupled system. According to the tropical air-sea interaction waves we obtain here, a possible explanation to the propagating process of ENSO events is given.
References

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Manuscript History

Manuscript received: 10 January 1993

Manuscript revised: 10 January 1993

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

Unstable Tropical Air-Sea Interaction Waves and Their Physical Mechanisms

1. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100080,National Research Center for Marine Environment Forecasts, State Oceanic Administration, Beijing 100081

Manuscript received: 1993-01-10
Manuscript revised: 1993-01-10

Abstract: In this paper, the tropical air-sea interaction is discussed by using a simple air-sea coupled model, in which the inertia-gravity waves are filtered off and only the equatorial Rossby waves are reserved in both the atmosphere and the ocean. There exist two kinds of air-sea interaction waves in the coupled model, that is, the high-frequency fast waves and the low-frequency slow waves. The phase speed of the fast waves is westward and the frequencies are close to those of the equatorial Rossby waves in the atmosphere. The slow waves propagate westward in the part of short wavelengths and eastward in that of long wavelengths. There exist instabilities for both the westward and eastward propagating slow waves. If the fast waves are filtered off, there is little effect on the slow waves which have great in-fluence on the long range process in the tropical air-sea coupled system. According to the tropical air-sea interaction waves we obtain here, a possible explanation to the propagating process of ENSO events is given.