FN Archimer Export Format
PT J
TI Damping of climate-scale oceanic variability by mesoscale eddy turbulence
BT 
AF Sévellec, Florian
   Naveira Garabato, A. C.
   Huck, Thierry
AS 1:1;2:2;3:;
FF 1:;2:;3:;
C1 Laboratoire d'Océanographie Physique et Spatiale, Univ-Brest CNRS IRD Ifremer, Brest, France
   Ocean and Earth Science, University of Southampton, Southampton, UK
C2 CNRS, FRANCE
   UNIV SOUTHAMPTON, UK
UM LOPS
IN WOS Cotutelle UMR
   copubli-europe
IF 3.806
TC 6
UR https://archimer.ifremer.fr/doc/00658/77057/78356.pdf
LA English
DT Article
DE ;Ocean;Southern Ocean;Eddies;Large-scale motions;Nonlinear dynamics;In situ oceanic observations
AB The impact of mesoscale eddy turbulence on long-term, climatic variability in the ocean's buoyancy structure is investigated using observations from a mooring deployed in the Drake Passage, Southern Ocean. By applying the Temporal-Residual-Mean framework and characterizing the variance contributors and the buoyancy variance budget, we identify the main source and sink of long-term buoyancy variance. Long-term buoyancy variance amplitude is set by long-term vertical velocity fluctuations acting on the steady stratification. This baro-clinic buoyancy flux is also the main source of the variance, indicative of the effect of large-scale baroclinic instability. This source is balanced by a sink of long-term buoyancy variance associated with the vertical advection of the steady stratification by the eddy-induced circulation. We conclude that mesoscale eddy turbulence acts as a damping mechanism for long-term, climatic variability in the region of the observations, consistent with an ‘eddy saturated’ behaviour of the Antarctic Circumpolar Current. 
PY 2021
PD JAN
SO Journal Of Physical Oceanography
SN 0022-3670
PU American Meteorological Society
VL 51
IS 2
UT 000646377800013
BP 491
EP 503
DI 10.1175/JPO-D-20-0141.1
ID 77057
ER

EF