FN Archimer Export Format
PT J
TI Mesoscale Eddy Kinetic Energy budgets and transfers between vertical modes in the Agulhas Current
BT 
AF TEDESCO, Pauline
   GULA, Jonathan
   PENVEN, Pierrick
   MENESGUEN, Claire
AS 1:3;2:2,3;3:4;4:1;
FF 1:;2:;3:;4:PDG-ODE-LOPS-OH;
C1 Univ. Brest, CNRS, IRD, Ifremer, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, 29280, Brest, France
   Institut Universitaire de France (IUF), France
   Univ. Brest, CNRS, IRD, Ifremer, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, 29280, Brest, France
   Univ. Brest, CNRS, IRD, Ifremer, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, 29280, Brest, France
C2 IFREMER, FRANCE
   INST UNIV FRANCE, FRANCE
   UBO, FRANCE
   IRD, FRANCE
SI BREST
SE PDG-ODE-LOPS-OH
UM LOPS
IN WOS Ifremer UMR
   WOS Cotutelle UMR
   copubli-france
   copubli-p187
   copubli-univ-france
IF 3.5
TC 4
UR https://archimer.ifremer.fr/doc/00746/85808/90956.pdf
LA English
DT Article
DE ;Boundary currents;Eddies;Energy budget;balance;Internal waves;Kinetic energy;Mesoscale processes;Regional models
AB Western boundary currents are hotspots of mesoscale variability and eddy-topography interactions, which channel energy toward smaller scales and eventually down to dissipation. Here, we assess the main mesoscale eddies energy sinks in the Agulhas Current region from a regional numerical simulation. We derive an eddy kinetic energy (¯¯¯¯¯¯¯¯¯EKE) budget in the framework of the vertical modes. It accounts for energy transfers between energy reservoirs and vertical modes, including transfers channeled by topography. The variability is dominated by mesoscale eddies (barotropic and 1st baroclinic modes) in the path of intense mean currents. Eddy-topography interactions result in a major mesoscale eddy energy sink, along three different energy routes, with comparable importance : transfers toward bottom-intensified time-mean currents, generation of higher baroclinic modes, and bottom friction. The generation of higher baroclinic modes takes different forms in the Northern Agulhas Current, where it corresponds to non-linear transfers to smaller vertical eddies on the slope, and in the Southern Agulhas Current, where it is dominated by a (linear) generation of internal-gravity waves over topography. Away from the shelf, mesoscale eddies gain energy by an inverse vertical turbulent cascade. However, the Agulhas Current region remains a net source of mesoscale eddy energy due to the strong generation of eddies, modulated by the topography, especially in the Southern Agulhas Current. It shows that the local generation of mesoscale eddies dominates the net ¯¯¯¯¯¯¯¯¯EKE budget, contrary to the paradigm of mesoscale eddies decay upon western boundaries. 
PY 2022
PD APR
SO Journal Of Physical Oceanography
SN 0022-3670
PU American Meteorological Society
VL 52
IS 4
UT 000797940200009
BP 677
EP 704
DI 10.1175/JPO-D-21-0110.1
ID 85808
ER

EF