Relationship between the sonic layer depth and mixed layer depth identified from U.S. Navy sea glider data
Villarreal, Vance A.
Chu, Peter C.
Bestch, Ronald E.
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The mixed layer depth (MLD) represents the upper ocean mixing, and the sonic layer depth (SLD) reveals the capacity of the upper ocean to trap acoustic energy and create a surface duct. A set of sea glider date from the Naval Oceanographic Office is used to identify the MLD and SLD at five locations. The maximum angle method is found to be the best among 17 existing MLD determination schemes of the four major methods (difference, gradient, curvature, and maximum angle). The maximum angle method is also found better than the currently used maximum value method in determining SLD. The optimally determined MLD and SLD by the maximum angle method from theNavy's glider data shows that one can swiftly, accurately, and objectively determine the MLD and SLD for operations in seas around the world.
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