FN Archimer Export Format
PT J
TI Tidal and near-inertial internal waves over the Reykjanes Ridge
BT 
AF Vic, Clement
   Ferron, Bruno
   Thierry, Virginie
   Mercier, Herle
   Lherminier, Pascale
AS 1:2;2:3;3:1;4:3;5:1;
FF 1:;2:;3:PDG-ODE-LOPS-OH;4:;5:PDG-ODE-LOPS-OH;
C1 Univ. Brest, CNRS, IRD, Ifremer, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, Plouzané, France
   Univ. Brest, CNRS, IRD, Ifremer, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, Plouzané, France
   Univ. Brest, CNRS, IRD, Ifremer, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, Plouzané, France
C2 IFREMER, FRANCE
   UBO, FRANCE
   CNRS, FRANCE
SI BREST
SE PDG-ODE-LOPS-OH
UM LOPS
IN WOS Ifremer UMR
   WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
IF 3.806
TC 15
UR https://archimer.ifremer.fr/doc/00661/77320/78768.pdf
LA English
DT Article
CR RREX 2015
   RREX 2017
BO Thalassa
   L'Atalante
DE ;Diapycnal mixing;Inertia-gravity waves;Wave properties;Tides;In situ oceanic observations
AB Internal waves in the semi-diurnal and near-inertial bands are investigated using an array of seven moorings located over the Reykjanes Ridge in a cross-ridge direction (57.6-59.1°N, 28.5-33.3°W). Continuous measurements of horizontal velocity and temperature for more than two years allow us to estimate the kinetic energy density and the energy fluxes of the waves. We found that there is a remarkable phase locking and linear relationship between the semi-diurnal energy density and the tidal energy conversion at the spring-neap cycle. The energy-to-conversion ratio gives replenishment time scales of 4-5 days on the ridge top vs 7-9 days on the flanks. Altogether, these results demonstrate that the bulk of the tidal energy on the ridge comes from near local sources, with a redistribution of energy from the top to the flanks, which is endorsed by the energy fluxes oriented in the cross-ridge direction. Implications for tidally-driven energy dissipation are discussed. The time-averaged near-inertial kinetic energy is smaller than the semi-diurnal kinetic energy by a factor 2-3, but is much more variable in time. It features a strong seasonal cycle with a winter intensification and sub-seasonal peaks associated with local wind bursts. The ratio of energy to wind work gives replenishment time scales of 13-15 days, which is consistent with the short time scales of observed variability of near-inertial energy. Finally, in the upper ocean (1 km), the highest levels of near-inertial energy are preferentially found in anticyclonic structures, with a twofold increase compared to cyclonic structures, illustrating the funneling effect of anticyclones. 
PY 2021
PD JAN
SO Journal Of Physical Oceanography
SN 0022-3670
PU American Meteorological Society
VL 51
IS 2
UT 000646377800009
BP 419
EP 437
DI 10.1175/JPO-D-20-0097.1
ID 77320
ER

EF