FN Archimer Export Format
PT J
TI Toward global maps of internal tide energy sinks
BT 
AF DE LAVERGNE, C.
   FALAHAT, S.
   MADEC, G
   ROQUET, F.
   NYCANDER, J.
   VIC, Clement
AS 1:1,2;2:3;3:1;4:4;5:3;6:5;
FF 1:;2:;3:;4:;5:;6:;
C1 Sorbonne Univ, CNRS IRD MNHN, LOCEAN Lab, F-75005 Paris, France.
   Univ New South Wales, Sch Math & Stat, Sydney, NSW 2052, Australia.
   Stockholm Univ, Dept Meteorol MISU, S-11418 Stockholm, Sweden.
   Univ Gothenburg, Dept Marine Sci, S-40530 Gothenburg, Sweden.
   Univ Southampton, Natl Oceanog Ctr, Southampton, Hants, England.
C2 UNIV PARIS 06, FRANCE
   UNIV NEW SOUTH WALES, AUSTRALIA
   UNIV STOCKHOLM, SWEDEN
   UNIV GOTHENBURG, SWEDEN
   UNIV SOUTHAMPTON, UK
IF 3.215
TC 74
UR https://archimer.ifremer.fr/doc/00763/87476/92971.pdf
LA English
DT Article
DE ;Ocean mixing;Internal tides;Energy dissipation;Parameterization
AB Internal tides power much of the observed small-scale turbulence in the ocean interior. To represent mixing induced by this turbulence in ocean climate models, the cascade of internal tide energy to dissipation scales must be understood and mapped. Here, we present a framework for estimating the geography of internal tide energy sinks. The mapping relies on the following ingredients: (i) a global observational climatology of stratification; (ii) maps of the generation of M-2, S-2 and K-1 internal tides decomposed into vertical normal modes; (iii) simplified representations of the dissipation of low-mode internal tides due to wave-wave interactions, scattering by small-scale topography, interaction with critical slopes and shoaling; (iv) Lagrangian tracking of low-mode energy beams through observed stratification, including refraction and reflection. We thus obtain a global map of the column-integrated energy dissipation for each of the four considered dissipative processes, each of the three tidal constituents and each of the first five modes. Modes >= 6 are inferred to dissipate within the local water column at the employed half-degree horizontal resolution. Combining all processes, modes and constituents, we construct a map of the total internal tide energy dissipation, which compares well with observational inferences of internal wave energy dissipation. This result suggests that tides largely shape observed spatial contrasts of dissipation, and that the framework has potential in improving understanding and modelling of ocean mixing. However, sensitivity to poorly constrained parameters and simplifying assumptions entering the parameterized energy sinks calls for additional investigation. The attenuation of low-mode internal tides by wave-wave interactions needs particular attention. 
PY 2019
PD MAY
SO Ocean Modelling
SN 1463-5003
PU Elsevier Sci Ltd
VL 137
UT 000467715700005
BP 52
EP 75
DI 10.1016/j.ocemod.2019.03.010
ID 87476
ER

EF