Open AccessRole of Parameterized Eddies in the Energy Budget of the Global Thermohaline Circulation: Cabbeling versus Restratification
Author(s) -
L. Shogo Urakawa,
Hiroyasu Hasumi
Publication year - 2010
Publication title -
journal of physical oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.706
H-Index - 143
eISSN - 1520-0485
pISSN - 0022-3670
DOI - 10.1175/2010jpo4361.1
Subject(s) - diabatic , kinetic energy , eddy , thermohaline circulation , mesoscale meteorology , energy budget , dissipation , mechanics , environmental science , physics , mixing (physics) , baroclinity , circulation (fluid dynamics) , atmospheric sciences , adiabatic process , climatology , meteorology , geology , thermodynamics , classical mechanics , turbulence , quantum mechanics
The gravitational potential energy (GPE) budget of the global thermohaline circulation is investigated with a non-eddy-resolving model under a realistic configuration. The model incorporates parameterizations for mesoscale eddies and an equation of state that takes pressure dependency of density into account. Both vertical mixing and energy conversion from kinetic energy equally supply the GPE to the ocean, and its total amount is about 680 GW. Earlier studies point out that most of the GPE supplied by vertical mixing and energy conversion from kinetic energy is consumed by the cabbeling effect associated with the diabatic diffusion process. However, this study reveals that over 60% of the supplied GPE is adiabatically converted to eddy kinetic energy by the layer thickness diffusion and undergoes viscous dissipation, which is not resolved in the low-resolution model used here. Although the cabbeling effect on the GPE budget reduces in the presence of parameterizations of mesoscale eddies, its contribution is not necessarily negligible.