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Modulation of Tropical Instability Wave Intensity by Equatorial Kelvin Waves.

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Title: Modulation of Tropical Instability Wave Intensity by Equatorial Kelvin Waves.
Authors: Holmes, R. M., Thomas, L. N.
Source: Journal of Physical Oceanography. Sep2016, Vol. 46 Issue 9, p2623-2643. 21p.
Subjects: Kinetic energy, Mathematical models of oceanography, Ocean waves, Energy budget (Geophysics), Ocean dynamics
Geographic Terms: Pacific Ocean
Abstract: Tropical instability waves (TIWs) and equatorial Kelvin waves are dominant sources of intraseasonal variability in the equatorial Pacific Ocean, and both play important roles in the heat and momentum budgets of the large-scale flow. While individually they have been well studied, little is known about how these two features interact, although satellite observations suggest that TIW propagation speed and amplitude are modulated by Kelvin waves. Here, the influence of Kelvin waves on TIW kinetic energy (TIWKE) is examined using an ensemble set of 1/4° ocean model simulations of the equatorial Pacific Ocean. The results suggest that TIWKE can be significantly modified by 60-day Kelvin waves. To leading order, TIWs derive kinetic energy from the meridional shear and available potential energy of the background zonal currents, while losing TIWKE to friction and the radiation of waves. The passage of Kelvin waves disrupts this balance. Downwelling (upwelling) Kelvin waves induce decay (growth) in TIWKE through modifications to the background currents and the TIWs' Reynolds stresses. These modulations in TIWKE affect eddy heat fluxes and the downward radiation of waves, with implications for the variability of SST and the energetics of abyssal flows in the eastern equatorial Pacific. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Physical Oceanography is the property of American Meteorological Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Modulation of Tropical Instability Wave Intensity by Equatorial Kelvin Waves.
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  Data: <searchLink fieldCode="DE" term="%22Kinetic+energy%22">Kinetic energy</searchLink><br /><searchLink fieldCode="DE" term="%22Mathematical+models+of+oceanography%22">Mathematical models of oceanography</searchLink><br /><searchLink fieldCode="DE" term="%22Ocean+waves%22">Ocean waves</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+budget+%28Geophysics%29%22">Energy budget (Geophysics)</searchLink><br /><searchLink fieldCode="DE" term="%22Ocean+dynamics%22">Ocean dynamics</searchLink>
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  Label: Abstract
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  Data: Tropical instability waves (TIWs) and equatorial Kelvin waves are dominant sources of intraseasonal variability in the equatorial Pacific Ocean, and both play important roles in the heat and momentum budgets of the large-scale flow. While individually they have been well studied, little is known about how these two features interact, although satellite observations suggest that TIW propagation speed and amplitude are modulated by Kelvin waves. Here, the influence of Kelvin waves on TIW kinetic energy (TIWKE) is examined using an ensemble set of 1/4° ocean model simulations of the equatorial Pacific Ocean. The results suggest that TIWKE can be significantly modified by 60-day Kelvin waves. To leading order, TIWs derive kinetic energy from the meridional shear and available potential energy of the background zonal currents, while losing TIWKE to friction and the radiation of waves. The passage of Kelvin waves disrupts this balance. Downwelling (upwelling) Kelvin waves induce decay (growth) in TIWKE through modifications to the background currents and the TIWs' Reynolds stresses. These modulations in TIWKE affect eddy heat fluxes and the downward radiation of waves, with implications for the variability of SST and the energetics of abyssal flows in the eastern equatorial Pacific. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Physical Oceanography is the property of American Meteorological Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1175/JPO-D-16-0064.1
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      – Code: eng
        Text: English
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      – SubjectFull: Kinetic energy
        Type: general
      – SubjectFull: Mathematical models of oceanography
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      – SubjectFull: Ocean waves
        Type: general
      – SubjectFull: Energy budget (Geophysics)
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      – SubjectFull: Ocean dynamics
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      – SubjectFull: Pacific Ocean
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      – TitleFull: Modulation of Tropical Instability Wave Intensity by Equatorial Kelvin Waves.
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              Text: Sep2016
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