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Leif N. Thomas, John R. Taylor, Eric A. D’Asaro, Craig M. Lee, Jody M. Klymak, and Andrey Shcherbina

and their effect on mixing in the Gulf Stream and northern Sargasso Sea. For the work described here, two global class research vessels, the R/Vs Knorr and Atlantis surveyed around a subsurface, neutrally buoyant, acoustically tracked Lagrangian float (e.g., D’Asaro 2003 ) that was deployed in the middle of the strong front (North Wall) on the northern side of the Gulf Stream (see Fig. 1 ). The float was tracked using a Trackpoint II short-baseline acoustic tracking system mounted on the R

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Gualtiero Badin, Amit Tandon, and Amala Mahadevan

turbulent regimes is controversial, both in the context of the atmosphere and the ocean. In the atmosphere, the exponential growth described by (16) has been observed by balloon experiments launched near the tropopause in the Southern Hemisphere ( Morel and Larcheveque 1974 ; Er-El and Peskin 1981 ). Lacorata et al. (2004) , however, making use of finite-scale Lyapunov exponents, reanalyzed the same dataset to find that the growth followed Richardson’s law (18) . In the ocean, exponential growth

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Anne-Marie E. G. Brunner-Suzuki, Miles A. Sundermeyer, and M.-Pascale Lelong

IP, the horizontal velocity is dominated by larger structures, while vertical slices of PV continue to reveal vorticity at smaller scales ( Fig. 2d ). Fig . 2. Evolution of PV, velocity, and ρ ′ for frequent vortex forcing ( τ = 0.0125 IP) and no wave forcing, showing the gradual buildup of energy at large scales. Columns are for times (left) early, (middle) middle, and (right) late in the simulation. Horizontal and vertical slices through the domain are given in the upper and lower three rows

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Andrey Y. Shcherbina, Miles A. Sundermeyer, Eric Kunze, Eric D’Asaro, Gualtiero Badin, Daniel Birch, Anne-Marie E. G. Brunner-Suzuki, Jörn Callies, Brandy T. Kuebel Cervantes, Mariona Claret, Brian Concannon, Jeffrey Early, Raffaele Ferrari, Louis Goodman, Ramsey R. Harcourt, Jody M. Klymak, Craig M. Lee, M.-Pascale Lelong, Murray D. Levine, Ren-Chieh Lien, Amala Mahadevan, James C. McWilliams, M. Jeroen Molemaker, Sonaljit Mukherjee, Jonathan D. Nash, Tamay Özgökmen, Stephen D. Pierce, Sanjiv Ramachandran, Roger M. Samelson, Thomas B. Sanford, R. Kipp Shearman, Eric D. Skyllingstad, K. Shafer Smith, Amit Tandon, John R. Taylor, Eugene A. Terray, Leif N. Thomas, and James R. Ledwell

( Sundermeyer et al. 2014 ) suggest this banding may have been driven by mixed layer instability associated with a lateral density gradient. Near-field (meter scale) shear and dye studies. The O (1) m scale structure of the dye immediately after injection was measured by a custom-built Lagrangian float (see appendix for details) deployed in the middle of each fluorescein injection, typically 1–10 m from the actual streak. The float took about 1 h to sink to the dye level and was tracked acoustically

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