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Brazil Basin Tracer Release Experiment (BBTRE)
A WHOI program in 1996 and 1997 who goal was to use two independent methods to quantify turbulent mixing in the eastern Brazil Basin. The methods employed were:
- injecting an SF6 tracer and tracking its dissipation over time; and
- making discrete, instantaneous estimates of the turbulence using the HRP instrument.
The tracer was surveyed in 1996 within two weeks of its release, with HRP measurements indicating weak turbulent dissipation at all depths (with a diapycnal diffusivity of about 0. 1 cm2 s-1) in the western half of the Brazil Basin where the bottom is smooth. Mixing rates were much greater over the rough topography, with measured diapycnal diffusivity values of about 0. 5 cm2 s-1 for the depth and region of the tracer cloud (and values greater than twice this near the bottom). A survey cruise in 1997 sampled the distribution of sulfur hexafluoride about 14 months after its release. The average diffusivity over the 14 months on the injection isopycnal was estimated to be at least 1. 5 cm2 s-1, with values of 10 cm2 s-1 estimated near the bottom of the canyons.
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- Industry/Domain: Earth science
- Category: Physical oceanography
- Company: Texas A&M University
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