FN Archimer Export Format
PT J
TI Internal tide cycle and topographic scattering over the North Mid‐Atlantic Ridge
BT 
AF Lahaye, Noe
   Gula, Jonathan
   Roullet, Guillaume
AS 1:1,2;2:1;3:1;
FF 1:;2:;3:;
C1 Université de Bretagne Occidentale, CNRS IRD Ifremer Laboratoire d'Océanographie Physique et Spatiale (LOPS) IUEM Brest,France
   Campus Univ Beaulieu, IRMAR, INRIA, Rennes, France
C2 UBO, FRANCE
   INRIA, FRANCE
UM LOPS
IN WOS Cotutelle UMR
   copubli-france
IF 3.405
TC 9
UR https://archimer.ifremer.fr/doc/00658/77003/78259.pdf
LA English
DT Article
DE ;energy dissipation &mixing;internal tides;internal waves;topographic scattering
AB Internal tides are a predominant source of high‐frequency variability and diapycnal mixing in the ocean. Understanding their dynamics and lifecycle is necessary to better understand their role in the ocean circulation. In this paper, we describe and quantify internal tide generation, propagation and dissipation in a sector of the North Mid‐Atlantic Ridge, using high‐resolution numerical simulations with realistic bathymetry and stratification. We show that the generation and dissipation of internal tides, as well as the distribution of internal tides amongst vertical modes, exhibit high spatial variability. We find that topographic scattering leads to a significant transfer of energy towards high vertical modes and thereby enhances internal tide dissipation. On average, and especially on the ridge, this mechanism is dominant over the conversion from the barotropic tide for transferring energy to high (>7) vertical modes. The magnitude of the scattering of the first baroclinic internal mode is found to be in good agreement with theoretical predictions. Plain Language Summary Internal waves are dynamical perturbations propagating throughout the stratified ocean. The internal waves generated by the interaction of the astronomical tide with the seafloor, the so‐called ”internal tides”, are ubiquitous in the ocean. They are a predominant source of high‐frequency variability and mixing. Understanding their dynamics and lifecycle is necessary to better understand their role in the ocean circulation. Here, we describe and quantify the internal tides generation, propagation and dissipation in a sector of the North Mid‐Atlantic Ridge, using high‐resolution numerical simulations with realistic bathymetry and stratification. We find that the interaction of the internal tide with the topography, leading to topographic scattering, is an important mechanism for dissipating internal tides energy. 
PY 2020
PD DEC
SO Journal Of Geophysical Research-oceans
SN 2169-9275
PU American Geophysical Union (AGU)
VL 125
IS 12
UT 000603643300027
DI 10.1029/2020JC016376
ID 77003
ER

EF