Internal Waves in the East Australian Current

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Alford, Matthew; Sloyan, Bernadette; Simmons, Harper


2017-12-28


Journal Article


Geophysical Research Letters


44


24


12,280-12,288


Internal waves, which drive most ocean turbulence and add “noise” to lower‐frequency records, interact with low‐frequency current systems and topography in yet poorly known ways. Taking advantage of a heavily instrumented, 14 month mooring array, internal waves in the East Australian Current (EAC) are examined for the first time. Internal wave horizontal kinetic energy (HKE) is within a factor of 2 of the Garrett‐Munk (1976) spectrum. Continuum internal waves, near‐inertial waves, and internal tides together constitute a significant percentage of the total velocity variance. Mode‐1 internal tide energy fluxes are southward and much smaller than energy times group velocity, consistent with reflection at the continental slope of incident waves generated from near New Caledonia and the Solomon Islands. Internal tide HKE is highly phase variable, consistent with refraction by the variable EAC. Mode‐1 near‐inertial wave energy fluxes are of comparable magnitude and are equatorward and episodic, consistent with generation by storms farther poleward. These processes are considered together in the complex environment of the EAC.


American Geophysical Union


Internal; Waves; East Australian Current


Biological Sciences not elsewhere classified


https://doi.org/10.1002/2017GL075246


EP183088


Journal article - Refereed


English


Alford, Matthew; Sloyan, Bernadette; Simmons, Harper. Internal Waves in the East Australian Current. Geophysical Research Letters. 2017; 44(24):12,280-12,288. https://doi.org/10.1002/2017GL075246



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