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Meddies are anticyclonic (rotating clockwise) lenses of warm salty Mediterranean Water that travel through the North Atlantic between ∼500 and 1500 m depth. They are observed as large temperature, salinity and velocity anomalies (Richardson et al., 2000). Meddies are typically 40–100 km in diameter with their core being 500–1000 m thick. Meddies separate ...


8

The way I understand it is the height above the surface at which buoyant (heat) production of turbulence first equals the mechanical (shear) production of turbulence. A more useful definition is given by the American Meteorological Society: A parameter with dimension of length that gives a relation between parameters characterizing dynamic, thermal, and ...


6

The Obukhov length ($L$) measures the relative importance of mechanical shear-generated turbulence and density-driven (buoyancy) fluxes (1) $L$ can be used to determine the eddy structure of the flow and it provides a measure for the hydrodynamic stability of the boundary layer - it effectively imposes an upper limit on the vertical excursion of fluid ...


2

It is not clear that the Obukhov length has an exact physical interpretation. The length L is certainly a length that dimensional argument shows to follow from the set of basis parameters that Monin and Obukhov proposed was sufficient to describe turbulence in the bottom 10% or so of atmospheric boundary layers. We may ask several questions: is the MO basis ...


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