FN Archimer Export Format
PT J
TI Regional modeling of internal-tide dynamics around New Caledonia – Part 1: Coherent internal-tide characteristics and sea surface height signature
BT 
AF Bendinger, Arne
   Cravatte, Sophie
   Gourdeau, Lionel
   Brodeau, Laurent
   Albert, Aurélie
   Tchilibou, Michel
   Lyard, Florent
   Vic, Clement
AS 1:1;2:1,2;3:1;4:3;5:3;6:1;7:1;8:4;
FF 1:;2:;3:;4:;5:;6:;7:;8:PDG-ODE-LOPS-OH;
C1 Université de Toulouse, LEGOS (CNES/CNRS/IRD/UPS), Toulouse, France
   IRD, Centre IRD de Nouméa, New Caledonia
   Université Grenoble Alpes, CNRS, INRAE, IRD, Grenoble INP, Institut des Géosciences de l’Environnement, Grenoble, France
   Laboratoire d’Océanographie Physique et Spatiale, Univ. Brest, CNRS, Ifremer, IRD, Plouzané, France
C2 UNIV TOULOUSE, FRANCE
   IRD, FRANCE
   UNIV GRENOBLE ALPES, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-ODE-LOPS-OH
UM LOPS
IN WOS Ifremer UMR
   DOAJ
   copubli-france
   copubli-p187
   copubli-univ-france
IF 3.2
TC 1
UR https://archimer.ifremer.fr/doc/00851/96291/104545.pdf
   https://archimer.ifremer.fr/doc/00851/96291/104546.pdf
LA English
DT Article
CR SWOTALIS
BO Antea
AB The southwestern tropical Pacific exhibits a complex bathymetry and represents a hot spot of internal-tide generation. Based on a tailored high-resolution regional model, we investigate for the first time the internal-tide field around the New Caledonia islands through energy budgets that quantify the coherent internal-tide generation, propagation, and dissipation. A total of 15.27 GW is converted from the barotropic to the baroclinic M2 tide with the main conversion sites associated with the most prominent bathymetric structures such as continental slopes and narrow passages in the north (2.17 GW) and ridges and seamounts south of New Caledonia (3.92 GW). The bulk of baroclinic energy is generated in shallow waters around 500 m depth and on critical to supercritical slopes, highlighting the limitations of linear semi-analytical models in those areas. Despite the strongly dominant mode-1 generation, more than 50 % of the locally generated energy either dissipates in the near field close to the generation sites or loses coherence. The remaining baroclinic energy propagates within well-defined tidal beams with baroclinic energy fluxes of up to 30 kW m−1 toward the open ocean. The New Caledonia site represents a challenge for SWOT (Surface Water and Ocean Topography) observability of balanced motion in the presence of internal tides with sea surface height (SSH) signatures >6 cm at similar wavelengths. We show for our study region that a correction of SSH for the coherent internal tide potentially increases the observability of balanced motion from wavelengths >160 km to well below 100 km. 
PY 2023
PD AUG
SO Ocean Science
SN 1812-0784
PU Copernicus GmbH
VL 19
IS 4
UT 001171503400001
BP 1315
EP 1338
DI 10.5194/os-19-1315-2023
ID 96291
ER

EF