LagrangianG PS driftere xperimentsc, arriedo ut in the surfacel ayer of stratifiedL ake Kinneret( Israel),a represented. Differential kinematic properties and Lagrangian statistics were calculated and used to estimate thedominant mechanisms for horizontal dispersion. On time scales smaller than a few internal wave periods, internalwaves lead to strongd ivergencea nd convergencee vents, causingi nstantaneouas pparenht orizontalg rowthr atesthat were larger,b y up to an ordero f magnitudet,h ant he actualm eand ispersionc oefficient.I t is shownt hatt heinternal wave field modulated the vorticity field so as to satisfy conservation of potential vorticity. On time scaleslarger than a few internal wave periods, unbounded horizontal shear dispersion was of the same order as the actualmean observed dispersion coefficient (Ky = 17.1 m2 s-1), while vertical shear dispersion was negligible.
|Journal||Limnology and Oceanography|
|Publication status||Published - 2003|