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April 17, 2020Journal of Geophysical Research Oceans

Intraseasonal Kelvin Waves in the Equatorial Indian Ocean and Their Propagation into the Indonesian Seas

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To describe the structure and propagation of wind-forced intraseasonal Kelvin waves in the equatorial Indian Ocean and evaluate their penetration into the Indonesian seas.
Analyzed multiyear (2004–2016) moored velocity time series data from the equatorial central and eastern Indian Ocean as well as Lombok, Makassar, and Ombai straits.
Combined moored velocity measurements with satellite altimetry and oceanic and atmospheric datasets to evaluate wave dynamics across 20–90-day periods.
Equatorial Kelvin waves propagated eastward at speeds of 1.3 to 1.7 m s⁻¹ consistent with a second baroclinic mode, exhibiting an exponential latitudinal decay scale of approximately 250 km.
Waves showed upward phase propagation and downward energy propagation from surface wind forcing.
Upon reaching Sumatra, waves partially reflected into westward-propagating Rossby waves, while transmitted energy traveled southward along Sumatra and Java into Lombok, Ombai, and Makassar straits at lags of 2–3 weeks.

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Implication

Observational analysis reveals wind-forced intraseasonal Kelvin wave propagation into Indonesian straits, highlighting dynamic ocean connectivity across equatorial basins.

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Pujiana et al. (2020) studied this question.

synapsesocial.com/papers/69dd4caf27c48be1bb40ca9f https://doi.org/10.1029/2019jc015839

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Implication

Observational analysis reveals wind-forced intraseasonal Kelvin wave propagation into Indonesian straits, highlighting dynamic ocean connectivity across equatorial basins.

Intraseasonal Kelvin Waves in the Equatorial Indian Ocean and Their Propagation into the Indonesian Seas

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Implication

Cite This Study

Intraseasonal Kelvin Waves in the Equatorial Indian Ocean and Their Propagation into the Indonesian Seas

Key Points

Discussion

Implication

Cite This Study

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