论文信息 - Lateral friction in the oceans as an effect of potential vorticity mixing

Lateral friction in the oceans as an effect of potential vorticity mixing

Abstract Applying a mixing-length calculation to potential vorticity rather than to momentum a new type of lateral friction appears in the oceanic mass transport equations. This friction is evaluated for the special case of horizontally homogeneous, quasi-geostrophic turbulence. The main effect is a westward force arising from the so-called β-term. This produces an additional southward interior transport and a strengthening of the western boundary current. A turbulent exchange coefficient KH = 108 em2s−1 is sufficient to give a Gulf Stream transport twice that obtained by the classical Sverdrup model.

P. Welander | Pierre Welander

[1] F. Bretherton,et al. On the mixing of angular momentum in a stirred rotating fluid , 1968, Journal of Fluid Mechanics.

[2] H. Stommel,et al. The westward intensification of wind‐driven ocean currents , 1948 .

[3] Walter Munk,et al. ON THE WIND-DRIVEN OCEAN CIRCULATION , 1950 .

[4] J. Green,et al. Transfer properties of the large‐scale eddies and the general circulation of the atmosphere , 1970 .

[5] Geoffrey Ingram Taylor,et al. The transport of vorticity and heat through fluids in turbulent motion , 1932 .

[6] H. Stommel,et al. The Gulf Stream : a physical and dynamical description , 1958 .

[7] R. B. Montgomery,et al. The Equatorial Undercurrent in the Light of the Vorticity Equation , 1955 .

[8] R. Dickinson. Theory of Planetary Wave-Zonal Flow Interaction. , 1969 .

[9] V. Starr. Physics of Negative Viscosity Phenomena , 1968 .

[10] N. Phillips. Large‐scale eddy motion in the western Atlantic , 1966 .

[11] F. Bretherton. Critical layer instability in baroclinic flows , 1966 .

[12] F. Webster. Measurements of eddy fluxes of momentum in the surface layer of the Gulf Stream , 1965 .