Model simulations were carried out when one of the authors, R. S. Ajayamohan was a visiting scientist at Center for Ocean–Atmospheric Prediction Studies (COAPS), Florida State University. R. S. Ajayamohan would like to thank Prof. James J. O’Brien, who gave an opportunity to work at COAPS. Thanks are due to Drs. D. W. Shin, Steve Cocke, and T. E. LaRow for helpful discussions for carrying out the model simulations. Thanks to Matthew Wheeler for providing codes to calculate wavenumber–frequency spectra. We acknowledge Jaison Kurian, CAOS, IISc for helping us perform some calculations using wavenumber–frequency spectra. We thank two anonymous reviewers for their valuable comments that helped improve the manuscript. We are thankful to Department of Ocean Development, India, for a grant.
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