Birch Daniel

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  • Article
    Observations and numerical simulations of large-eddy circulation in the ocean surface mixed layer
    (John Wiley & Sons, 2014-11-06) Sundermeyer, Miles A. ; Skyllingstad, Eric D. ; Ledwell, James R. ; Concannon, Brian ; Terray, Eugene A. ; Birch, Daniel ; Pierce, Stephen D. ; Cervantes, Brandy T. Kuebel
    Two near-surface dye releases were mapped on scales of minutes to hours temporally, meters to order 1 km horizontally, and 1–20 m vertically using a scanning, depth-resolving airborne lidar. In both cases, dye evolved into a series of rolls with their major axes approximately aligned with the wind and/or near-surface current. In both cases, roll spacing was also of order 5–10 times the mixed layer depth, considerably larger than the 1–2 aspect ratio expected for Langmuir cells. Numerical large-eddy simulations under similar forcing showed similar features, even without Stokes drift forcing. In one case, inertial shear driven by light winds induced large aspect ratio large-eddy circulation. In the second, a preexisting lateral mixed layer density gradient provided the dominant forcing. In both cases, the growth of the large-eddy structures and the strength of the resulting dispersion were highly dependent on the type of forcing.