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Justin Shapiro

Research Engineer-Principal

Email

jshapiro@apl.uw.edu

Phone

206-616-7384

Education

B.S. Ocean Physics, and Meteorology, Rutgers University, 2008

M.S. Systems and Controls, Georgia Institute of Technology, 2012

Publications

2000-present and while at APL-UW

Turbulence and vorticity in the wake of Palau

St. Laurent, L., T. Ijichi, S.T. Merrifield, J. Shapiro, and H.L. Simmons, "Turbulence and vorticity in the wake of Palau," Oceanography, 32, 102-109, doi:10.5670/oceanog.2019.416, 2019.

More Info

1 Dec 2019

The interaction of flow with steep island and ridge topography at the Palau island chain leads to rich vorticity fields that generate a cascade of motions. The energy transfer to small scales removes energy from the large-scale mean flow of the equatorial current systems and feeds energy to the fine and microstructure scales where instability mechanisms lead to turbulence and dissipation. Until now, direct assessments of the turbulence associated with island wakes have received only minimal attention. Here, we examine data collected from an ocean glider equipped with microstructure sensors that flew in the island wake of Palau. We use a combination of submesoscale modeling and direct observation to quantify the relationship between vorticity and turbulence levels. We find that direct wind-driven mixing only accounts for about 10% of the observed turbulence levels, suggesting that most of the energy for mixing is extracted from the shear associated with the vorticity field in the island’s wake. Below the surface layer, enhanced turbulence correlates with the phase and magnitude of the relative vorticity and strain levels of the mesoscale flow.

Acoustics Air-Sea Interaction & Remote Sensing Center for Environmental & Information Systems Center for Industrial & Medical Ultrasound Electronic & Photonic Systems Ocean Engineering Ocean Physics Polar Science Center
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