FN Archimer Export Format
PT J
TI Validation of Thorpe-scale-derived vertical diffusivities against microstructure measurements in the Kerguelen region
BT 
AF PARK, Y. -H.
   LEE, J. -H.
   DURAND, I.
   HONG, C. -S.
AS 1:1;2:2;3:1;4:2;
FF 1:;2:;3:;4:;
C1 MNHN Sorbonne Univ, UPMC, Univ Paris 06, CNRS IRD LOCEAN Lab,Museum Natl Hist Nat, F-75005 Paris, France.
   Korea Inst Ocean Sci & Technol, Ansan, South Korea.
C2 MNHN, FRANCE
   KIOST, SOUTH KOREA
IN DOAJ
IF 3.978
TC 23
UR https://archimer.ifremer.fr/doc/00291/40210/39323.pdf
   https://archimer.ifremer.fr/doc/00291/40210/81219.pdf
LA English
DT Article
CR MD 145 / KEOPS
   MD 188 / KEOPS 2
BO Marion Dufresne
AB The Thorpe scale is an energy-containing vertical overturning scale of large eddies associated with shear-generated turbulence. This study investigates indirect estimates of vertical diffusivities from the Thorpe scale method in the polar front region east of the Kerguelen Islands based on fine-scale density profiles gathered during the 2011 KEOPS2 (KErguelen Ocean and Plateau compared Study 2) cruise. These diffusivities are validated in comparison with diffusivities estimated from the turbulence dissipation rate directly measured via a TurboMAP (Turbulence ocean Microstructure Acquisition Profiler) microstructure profiler. The results are sensitive to the choice of the diffusivity parameterization and the overturn ratio R-o, and the optimal results have been obtained from the parameterization by Shih et al. (2005) and the R-o = 0.25 criterion, rather than the parameterization by Osborn (1980) and the R-o = 0.2 criterion originally suggested by Gargett and Garner (2008). The Thorpe-scale-derived diffusivities in the KEOPS2 region show a high degree of spatial variability, ranging from a canonical value of O (10(-5)) m(2) s(-1) in the Winter Water layer and in the area immediately north of the polar front to a high value of O (10(-4)) m(2) s(-1) in the seasonal thermocline between the surface mixed layer and the Winter Water. The latter high diffusivities are found especially over the shallow plateau southeast of the Kerguelen Islands and along the polar front that is attached to the escarpment northeast of the islands. The interaction of strong frontal flow with prominent bottom topography likely causes the observed elevated mixing rates.
PY 2014
PD DEC
SO Biogeosciences
SN 1726-4170
PU Copernicus Gesellschaft Mbh
VL 11
IS 23
UT 000346357100028
BP 6927
EP 6937
DI 10.5194/bg-11-6927-2014
ID 40210
ER

EF