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Enhanced Energy Dissipation in the Equatorial Pycnocline by Wind-Induced Internal Wave Activity
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2019
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Source: Journal of Geophysical Research: Oceans, 124, 6200– 6217
[PDF-11.19 MB]
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Journal Title:Journal of Geophysical Research: Oceans
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Description:Numerical experiments show that in a zonally symmetric model of a tropical ocean forced only by transient winds both inertia-gravity wave activity and the energy dissipation rate have a pronounced maximum in the pycnocline close to the equator regardless of the latitudinal distribution of the energy input into the ocean's mixed layer. We consider a number of factors that determine the spatial distribution of mixing and find that equatorial enhancement is due to a combination of three factors: a stronger superinertial component of the wind forcing close to the equator, wave action convergence at turning latitudes for equatorially trapped waves, and nonlinear wave-wave interactions between equatorially trapped waves. The most important factor is wave action convergence at turning latitudes.
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Source:Journal of Geophysical Research: Oceans, 124, 6200– 6217
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