Oceanic Mesoscale Eddy Depletion Catalyzed by Internal Waves
|Author(s)||Barkan Roy1, 2, Srinivasan Kaushik2, Yang Luwei2, McWilliams James C.2, Gula Jonathan4, 5, Vic Clement3|
|Affiliation(s)||1 : Tel Aviv Univ, Porter Sch Environm & Earth Sci, Tel Aviv, Israel.
2 : Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA.
3 : Univ Bretagne Occidentale, Lab Oceanog Phys & Spatiale, Plouzane, France.
4 : Inst Univ France IUF, Paris, France.
5 : Univ Bretagne Occidentale, Lab Oceanog Phys & Spatiale, Plouzane, France.
|Source||Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2021-09 , Vol. 48 , N. 18 , P. e2021GL094376 (11p.)|
|WOS© Times Cited||12|
|Keyword(s)||oceanic energy transfers, mesoscale eddies, submesoscale fronts, internal waves|
The processes leading to the depletion of oceanic mesoscale kinetic energy (KE) and the energization of near-inertial internal waves are investigated using a suite of realistically forced regional ocean simulations. By carefully modifying the forcing fields we show that solutions where internal waves are forced have similar to 25% less mesoscale KE compared with solutions where they are not. We apply a coarse-graining method to quantify the KE fluxes across time scales and demonstrate that the decrease in mesoscale KE is associated with an internal wave-induced reduction of the inverse energy cascade and an enhancement of the forward energy cascade from sub-to super-inertial frequencies. The integrated KE forward transfer rate in the upper ocean is equivalent to half and a quarter of the regionally averaged near-inertial wind work in winter and summer, respectively, with the strongest fluxes localized at surface submesoscale fronts and filaments.