Cloud Feedback on SST Variability in the Western Equatorial Pacific in GOALS / LASG Model

Liu Hui; Zhang Xuehong; Wu Guoxiong

doi:10.1007/s00376-998-0011-y

Impact Factor: 5.8

Volume 15 Issue 3

Jul. 1998

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 1998 > 15(3): 412-423

Cloud Feedback on SST Variability in the Western Equatorial Pacific in GOALS / LASG Model

1.
State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute or Atmospheric Physics (IAP), Chinese Academy of Sciences, P.O.Box 2718, Beijing 100080,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute or Atmospheric Physics (IAP), Chinese Academy of Sciences, P.O.Box 2718, Beijing 100080,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute or Atmospheric Physics (IAP), Chinese Academy of Sciences, P.O.Box 2718, Beijing 100080

doi: 10.1007/s00376-998-0011-y

Abstract
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Abstract:
The cloud feedback on the SST variability in the western equatorial Pacific in GOALS / LASG model is studied in this paper. Two versions of the model, one with the diagnostic cloud and another with the prescribed cloud, are used. Both versions are integrated for 45 years. It is found that in the prescribed cloud run, the SST variability in the western equatorial Pacific is mainly of interdecadal time scale and the interannual variability is very weak. In the diagnostic cloud run, however, the interdecadal SST variability is depressed much and the interannual SST variability becomes much significant. The mechanism for the feedback is then explored. The variability of sea surface temperature (SST) in the western equatorial Pacific is found to be controlled mainly by the zonal wind anomaly, through the process of upwelling / downwelling in both versions. Then it is found that in the diagnostic cloud case, the negative feedback of the solar short wave (SW) flux acts significantly to balance the effect of upwelling / downwelling in addition to the la?tent flux. In addition, the variability of the SW flux is shown to be closely related to the variability of the middle and high cloud covers. Therefore, the negative feedback of the SW surface flux may have significant contribution to the cloud feedback on the SST variability.
- Cloud feedback on SST variability
References

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Manuscript History

Manuscript received: 10 July 1998

Manuscript revised: 10 July 1998

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

Cloud Feedback on SST Variability in the Western Equatorial Pacific in GOALS / LASG Model

1. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute or Atmospheric Physics (IAP), Chinese Academy of Sciences, P.O.Box 2718, Beijing 100080,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute or Atmospheric Physics (IAP), Chinese Academy of Sciences, P.O.Box 2718, Beijing 100080,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute or Atmospheric Physics (IAP), Chinese Academy of Sciences, P.O.Box 2718, Beijing 100080

Manuscript received: 1998-07-10
Manuscript revised: 1998-07-10

Abstract: The cloud feedback on the SST variability in the western equatorial Pacific in GOALS / LASG model is studied in this paper. Two versions of the model, one with the diagnostic cloud and another with the prescribed cloud, are used. Both versions are integrated for 45 years. It is found that in the prescribed cloud run, the SST variability in the western equatorial Pacific is mainly of interdecadal time scale and the interannual variability is very weak. In the diagnostic cloud run, however, the interdecadal SST variability is depressed much and the interannual SST variability becomes much significant. The mechanism for the feedback is then explored. The variability of sea surface temperature (SST) in the western equatorial Pacific is found to be controlled mainly by the zonal wind anomaly, through the process of upwelling / downwelling in both versions. Then it is found that in the diagnostic cloud case, the negative feedback of the solar short wave (SW) flux acts significantly to balance the effect of upwelling / downwelling in addition to the la?tent flux. In addition, the variability of the SW flux is shown to be closely related to the variability of the middle and high cloud covers. Therefore, the negative feedback of the SW surface flux may have significant contribution to the cloud feedback on the SST variability.

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