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Vertical Propagation of Middepth Zonal Currents Associated With Surface Wind Forcing in the Equatorial Indian Ocean
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2018
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Source: Journal of Geophysical Research: Oceans, 123(10), 7290-7307
[PDF-6.37 MB]
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Journal Title:Journal of Geophysical Research: Oceans
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Description:The vertical propagation of middepth (200 –1,500 m) zonal velocity in the equatorial Indian Ocean (EIO) and its relationship with surface wind forcing are investigated. We focus on semiannual timescales, using in situ mooring observations and an oceanic reanalysis product that can reasonably well reproduce the structure and magnitude of the observed middepth zonal velocity in the EIO. The pronounced semiannual cycle in observed middepth zonal currents indicates a clear upward phase propagation withparticularly robust signatures at depths of 500 –1,000 m between 3°S to 3°N, 70 to 85°E. The main characteristics of the middepth currents are consistent with vertically propagating first-meridional-mode Rossby wave at semiannual period. Theory suggests that equatorial Kelvin waves, forced by zonal windvariations in the western half of the basin, transfer energy downward and eastward, re flecting into Rossby waves at the eastern boundary. These re flected Rossby waves transfer energy downward and westward,
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Source:Journal of Geophysical Research: Oceans, 123(10), 7290-7307
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ISSN:2169-9275;2169-9291;
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Rights Information:Other
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