Extremely long Kelvin-Helmholtz billow trains in the Romanche Fracture Zone - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2014

Extremely long Kelvin-Helmholtz billow trains in the Romanche Fracture Zone

Abstract

In the Atlantic Ocean, the densest water mass Antarctic Bottom Water " AABW " can only cross the Mid-Atlantic Ridge from its southwestern to northeastern basins in limited, because deep, conduits. At the southwestern entrance of one of these, the equatorial Romanche Fracture Zone, AABW crosses a sill at 4550 m depth in a 7 km narrow channel before plunging into the deep. At the sill-slope, the rapidly flowing AABW causes shear-induced turbulent mixing with the overlying water masses. We present an excerpt of 1 Hz sampled, half-yearlong moored observations from 99 high-resolution temperature sensors that demonstrate and quantify the turbulence details. On top of quasi-steady shear flow, an internal tide modulates the mixing. Together, they constitute a means for an extremely long train of >250 consecutive Kelvin-Helmholtz billows in a day that vary between 5 and 100 m in vertical scale.
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Dates and versions

hal-01166123 , version 1 (22-06-2015)

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Hans van Haren, Louis Gostiaux, Eugene Morozov, Roman Tarakanov. Extremely long Kelvin-Helmholtz billow trains in the Romanche Fracture Zone. Geophysical Research Letters, 2014, 41, pp.8445-8451. ⟨10.1002/2014GL062421⟩. ⟨hal-01166123⟩
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