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Journal Articles Geophysical Research Letters Year : 2020

Delineating the Seasonally Modulated Nonlinear Feedback Onto ENSO From Tropical Instability Waves

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1
Aoyun Xue
  • Function : Author
Fei-Fei Jin
  • Function : Author
Wenjun Zhang
  • Function : Author
Sen Zhao
  • Function : Author
Xinyi Yuan
  • Function : Author

Abstract

Tropical instability waves (TIWs), the dominant form of eddy variability in the tropics, have a peak period at about 5 weeks and are strongly modulated by both the seasonal cycle and El Niño-Southern Oscillation (ENSO). In this study, we first demonstrated that TIW-induced nonlinear dynamical heating (NDH) is basically proportional to the TIW amplitude depicted by a complex index for TIW. We further delineated that this NDH, capturing the seasonally modulated nonlinear feedback of TIW activity onto ENSO, is well approximated by a theoretical formulation derived analytically from a simple linear stochastic model for the TIW index. The results of this study may be useful for the climate community to evaluate and understand the TIW-ENSO multiscale interaction.
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insu-03671099 , version 1 (18-05-2022)

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Aoyun Xue, Fei-Fei Jin, Wenjun Zhang, Julien Boucharel, Sen Zhao, et al.. Delineating the Seasonally Modulated Nonlinear Feedback Onto ENSO From Tropical Instability Waves. Geophysical Research Letters, 2020, 47, ⟨10.1029/2019GL085863⟩. ⟨insu-03671099⟩
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