FN Archimer Export Format
PT J
TI Observational evidence of diapycnal upwelling within a sloping submarine canyon
BT 
AF Wynne-Cattanach, Bethan
   Alford, Matthew
   Couto, Nicole
   Drake, Henri
   Ferrari, Raffaele
   Le Boyer, Arnaud
   Mercier, Herle
   Messias, Marie-Jose
   Naveira Garabato, Alberto
   Polzin, Kurt
   Ruan, Xiaozhou
   Spingys, Carl
   van Haren, Hans
   Voet, Gunnar
AS 1:1;2:1;3:1;4:2;5:3;6:1;7:4;8:5;9:6;10:7;11:8;12:9;13:10;14:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;
C1 Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92037, USA
   Princeton University / Geophysical Fluid Dynamics Laboratory, Princeton, NJ 08540, USA
   Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
   Laboratoire d’Océanographie Physique et Spatiale, CNRS, Ifremer Centre de Bretagne, Plouzané, France
   Deparment of Geography, University of Exeter, Exeter, EX4 4QE, UK
   Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton, SO14 3ZH, UK
   Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
   Department of Earth and Environment, Boston University, Boston, MA 02215, USA
   National Oceanography Centre, Southampton, SO14 3ZH, UK
   Royal Netherlands Institute for Sea Research (NIOZ), P.O. Box 59, 1790 AB Den Burg, 30 the Netherlands.
C2 UNIV CALIF SAN DIEGO, USA
   UNIV PRINCETON, USA
   WHOI, USA
   CNRS, FRANCE
   UNIV EXETER, UK
   UNIV SOUTHAMPTON, UK
   MIT, USA
   UNIV BOSTON, USA
   NOC, UK
   NIOZ, NETHERLANDS
SI BREST
SE PDG-ODE-LOPS-OH
UM LOPS
TC 0
UR https://archimer.ifremer.fr/doc/00858/96983/105671.pdf
LA English
DT Article
AB Small-scale turbulent mixing drives the upwelling of deep water masses in the abyssal ocean as part of the global overturning circulation (Wunsch & Ferrari 2004). However, the processes leading to mixing and the pathways through which this upwelling occurs remain insufficiently understood. Recent observational and theoretical work suggests that deep water upwelling may be focused in bottom boundary layers on the ocean’s sloping seafloor; however, direct evidence of this is lacking (Ledwell et al. 2000, St. Laurent et al. 2001, Ferrari et al. 2016, de Lavergne et al. 2016). Here, we present observations from a near-bottom dye release within a canyon on the North Atlantic continental slope showing upwelling across density surfaces at a rate of 250 +/- 75 m/day over three days, ∼10,000 times higher than the global average value required to account for ∼30 Sv of upwelling globally (Munk 1966). The vigourous upwelling is coupled with adiabatic exchange of near-boundary and interior fluid. These results provide direct evidence of strong, bottom-focused diapycnal upwelling in the deep ocean, supporting previous suggestions that mixing at topographic features, such as canyons, leads to upwelling. 
PY 2023
PD OCT
SO Under Review at Nature Portfolio
PU Research Square Platform LLC
DI 10.21203/rs.3.rs-3459062/v1
ID 96983
ER

EF