FN Archimer Export Format
PT J
TI Deep Currents in the Rift Valley of the North Mid-Atlantic Ridge
BT 
AF Lahaye, Noe
   Gula, Jonathan
   Thurnherr, Andreas M.
   Reverdin, Gilles
   Bouruet-Aubertot, Pascale
   Roullet, Guillaume
AS 1:4;2:1;3:2;4:3;5:3;6:1;
FF 1:;2:;3:;4:;5:;6:;
C1 Univ. Brest, CNRS, IRD, Ifremer, Laboratoire dOcéanographie Physique et Spatiale (LOPS), IUEM, Brest, France
   Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States
   Sorbonne Université, CNRS/IRD/MNHN (LOCEAN UMR7159), Paris, France
C2 UBO, FRANCE
   LDEO, USA
   UNIV PARIS 06, FRANCE
   CNES, FRANCE
UM LOPS
IN WOS Cotutelle UMR
   DOAJ
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
IF 5.247
TC 14
UR https://archimer.ifremer.fr/doc/00584/69630/67486.pdf
LA English
DT Article
CR GRAVILUCK
   MOMARDREAM-NAUT1-NAUT2
BO L'Atalante
   Pourquoi pas ?
DE ;deep currents;transport;deep turbulence;internal waves and tides;realistic modeling;in situ observation
AB Over mid-ocean ridges, the interaction between the currents and the topography gives rise to complex flows, which drive the transport properties of biogeochemical constituents, and especially those associated with hydrothermal vents, thus impacting associated ecosystems. This paper describes the circulation in the rift valley along the Azores sector of the North Mid-Atlantic Ridge, using a combination of in-situ data from several surveys and realistic high-resolution modeling. It confirms the presence of a mean deep current with an up-valley branch intensified along the right inner flank of the valley (looking downstream), and a weaker down-valley branch flowing at shallower depth along the opposite flank. The hydrographic properties of the rift-valley water, and in particular the along-valley density gradient that results from a combination of the topographic isolation, the deep flow and the related mixing, are quantified. We also show that the deep currents exhibit significant variability and can be locally intense, with typical values greater than 10 cm/s. Finally, insights on the dynamical forcings of the deep currents and their variability are provided using numerical simulations, showing that tidal forcing of the mean circulation is important and that the overlying mesoscale turbulence triggers most of the variability. 
PY 2019
PD SEP
SO Frontiers In Marine Science
SN 2296-7745
PU Frontiers Media SA
VL 6
IS 597
UT 000487323000001
DI 10.3389/fmars.2019.00597
ID 69630
ER

EF