This is EM-APEX float data collected in 2016 supporting the research article "Near-inertial wave interactions and turbulence production in a Kuroshio anticyclonic eddy" to be submitted to Journal of Physical Oceanography.
Authors: Essink S, E Kunze, RC Lien, R Inoue, S Ito

For further questions:
Sebastian Essink
University of Washington/ Applied Physics Laboratory
Email: sessink@uw.edu
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Semi-Lagrangian profile timeseries were collected in the western Pacific east of Japan as two floats drifted with the mean current in the upper 500-m. Files are in netCDF format and generated with the Xarray python package.

Coordinates: 
Depth
Time
Latitude
Longitude

Variables [Depth x Time]:
temperature (T)             [celsius]
salinity (S)                [g/kg]
density (rho)               [kg/m3]
velocity (u, v)             [m/s]
shear (du/dz, dv/dz)        [1/s]
dissipation rate (eps)      [W/kg]
thermal diffusivity (kT)    [m2/s]

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Abstract
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Two EM-APEX profiling floats measured generation, propagation, interaction and dissipation of near-inertial waves generated by typhoons (i) Mindulle during 22 August 2016 and (ii) Lionrock during 30 August 2016, near the radius of maximum velocity in a mesoscale anticyclonic eddy in the Kuroshio-Oyashio Confluence east of Japan.  High-vertical-wavenumber near-inertial waves exhibit energy-flux inward toward eddy center, indicating wave refraction and/or reflection at the eddy perimeter.  The observed time rate of change of near-inertial horizontal kinetic energy is nearly two orders of magnitude greater than observed dissipation rates, pointing to this variability being due to horizontal propagation or advection of laterally finite wave packets in and out of the measurement window.  Between 80-150 m depth, low turbulence is observed, with turbulent kinetic energy dissipation rates ε ~ O(10-10 W kg-1)  on the eddy perimeter more than an order of magnitude weaker than outside the eddy, suggesting that near-inertial waves break at greater depths or different eddy radii.  Between 210-280 m depth, small-scale inertial patches of intense turbulence are associated with near-critical Ri, due to the superposition of comparable near-inertial and eddy shears.  Persistent elevated turbulent dissipation rates ε ~ O(10-8 W kg-1) are also found below 280-m depth.  Three-dimensional ray-tracing simulations in a model eddy show that wave dynamics at the eddy perimeter are primarily controlled by radial gradients in vorticity and Doppler-shifting with much weaker contributions from vertical gradients, stratification and sloping isopycnals.  Surface-forced waves are initially refracted downward and inward through the core center, consistent with observed inward energy-flux.  At the radius of maximum velocity, a turning-point shadow zone is found in the upper pycnocline, consistent with weaker dissipation measured at these depths.  At greater depths, radial turning-point caustics are found which should amplify wave shear. Together with superposition of mean eddy shear, this should lead to enhanced breaking and turbulence production, consistent with microstructure measurements.