Advances in Atmospheric Sciences

, Volume 24, Issue 5, pp 833–844

ENSO phase-locking in an ocean-atmosphere coupled model FGCM-1.0

  • Zheng Weipeng  (郑伟鹏)
  • Yu Yongqiang  (俞永强)
Article

DOI: 10.1007/s00376-007-0833-z

Cite this article as:
Zheng, W. & Yu, Y. Adv. Atmos. Sci. (2007) 24: 833. doi:10.1007/s00376-007-0833-z

Abstract

The mean climatology and the basic characteristics of the ENSO cycle simulated by a coupled model FGCM-1.0 are investigated in this study. Although with some common model biases as in other directly coupled models, FGCM-1.0 is capable of producing the interannual variability of the tropical Pacific, such as the ENSO phenomenon. The mechanism of the ENSO events in the coupled model can be explained by “delayed oscillator” and “recharge-discharge” hypotheses. Compared to the observations, the simulated ENSO events show larger amplitude with two distinctive types of phase-locking: one with its peak phase-locked to boreal winter and the other to boreal summer. These two types of events have a similar frequency of occurrence, but since the second type of event is seldom observed, it may be related to the biases of the coupled model. Analysis show that the heat content anomalies originate from the central south Pacific in the type of events peaking in boreal summer, which can be attributed to a different background climatology from the normal events. The mechanisms of their evolutions are also discussed.

Key words

ENSO phase-locking coupled model 

Copyright information

© Science Press 2007

Authors and Affiliations

  • Zheng Weipeng  (郑伟鹏)
    • 1
    • 2
  • Yu Yongqiang  (俞永强)
    • 1
  1. 1.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  2. 2.Graduate University of the Chinese Academy of SciencesBeijingChina

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