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\begin{document}

\title{Stalling and Dissipation of a Near-Inertial Wave (NIW) in an
Anticyclonic Ocean Eddy: Direct Determination of Group Velocity and
Comparison with Theory}



\author[1]{Thomas B. Sanford}%
\author[1]{Barry B. Ma}%
\author[2]{Matthew H Alford}%
\affil[1]{University of Washington}%
\affil[2]{Scripps Institution of Oceanography}%


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  \date{June 09, 2024}


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\selectlanguage{english}
\begin{abstract}
A near-inertial wave stalling and breaking in a critical layer was
observed for a week by a pair of autonomous velocity and density
profilers on concentric paths in an ocean eddy. Profiler observations
also provide estimates of the eddy's vertical vorticity and shear,
quantities needed to test theories of downward near-inertial wave (NIW)
energy flux and loss from inertial wave--eddy interactions. The unique
observations of the wave's intrinsic frequency ?\selectlanguage{english}4;\textsubscript{?6;}\selectlanguage{english}
and vertical wavenumber ?\selectlanguage{english}A; provide a novel estimate of the vertical
group velocity \emph{C\textsubscript{gz}} from changes in
?\selectlanguage{english}4;\textsubscript{?6;}\selectlanguage{english} with respect to ?\selectlanguage{english}A;. Shear, strain, energy flux
convergence, and parameterized turbulence are all elevated near 140 m
depth, near the bottom of the strongest eddy velocities. Our
observations are consistent with a downgoing NIW's group velocity
decreasing owing to wave--eddy interactions, providing important clues
on global energetics of NIW mixing.%
\end{abstract}%



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