Biological and Environmental Research - Earth and Environmental System Sciences
Earth and Environmental System Modeling

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

TitleDelineating the Seasonally Modulated Nonlinear Feedback Onto ENSO From Tropical Instability Waves
Publication TypeJournal Article
Year of Publication2020
AuthorsXue, Aoyun, Jin Fei‐Fei, Zhang Wenjun, Boucharel Julien, Zhao Sen, and Yuan Xinyi
JournalGeophysical Research Letters
Volume47
Number7
Abstract / Summary

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.

URLhttp://dx.doi.org/10.1029/2019gl085863
DOI10.1029/2019gl085863
Journal: Geophysical Research Letters
Year of Publication: 2020
Volume: 47
Number: 7
Publication Date: 04/2020

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.

DOI: 10.1029/2019gl085863
Citation:
Xue, A, F Jin, W Zhang, J Boucharel, S Zhao, and X Yuan.  2020.  "Delineating the Seasonally Modulated Nonlinear Feedback Onto ENSO From Tropical Instability Waves."  Geophysical Research Letters 47(7).  https://doi.org/10.1029/2019gl085863.