FN Archimer Export Format
PT J
TI Deep through-flow in the Bight Fracture Zone
BT 
AF Petit, Tillys
   Thierry, Virginie
   Mercier, Herle
AS 1:1;2:1;3:2;
FF 1:PDG-ODE-LOPS-OH;2:PDG-ODE-LOPS-OH;3:;
C1 Univ Brest, CNRS, Ifremer, IRD, Laboratoire d'Océanographie Physique et Spatiale (LOPS), IUEM, F29280, Plouzané, France
   Univ Brest, CNRS, Ifremer, IRD, Laboratoire d'Océanographie Physique et Spatiale (LOPS), IUEM, F29280, Plouzané, France
C2 IFREMER, FRANCE
   CNRS, FRANCE
SI BREST
SE PDG-ODE-LOPS-OH
UM LOPS
IN WOS Ifremer UMR
   WOS Cotutelle UMR
   DOAJ
   copubli-france
IF 3.2
TC 2
UR https://archimer.ifremer.fr/doc/00767/87921/93522.pdf
   https://archimer.ifremer.fr/doc/00767/87921/95216.pdf
LA English
DT Article
CR OVIDE
   OVIDE 2018
   RREX 2015
   RREX 2017
BO Thalassa
   L'Atalante
AB Iceland-Scotland Overflow Water (ISOW) is exported from the Nordic Seas into the Iceland Basin to feed the lower limb of the Meridional Overturning Circulation. The Bight Fracture Zone (BFZ) is known to be a major route for ISOW toward the Irminger Sea, but the role of this gateway in the evolution of ISOW properties over the subpolar gyre is unclear. A combination of ship-based and Deep-Argo data gathered between 2015 and 2018 allows us to investigate the pathways and hydrological evolution of ISOW as it flows through the BFZ, as well as its influence on the ISOW properties in the Irminger Sea. The ISOW flow through the BFZ amounts to 0.76 ± 0.2 Sv and is mainly fed by the lighter part of the ISOW layer flowing west of 29–30° W as part of the East Reykjanes Ridge Current in the Iceland Basin. In the rift valley of the BFZ, between an eastern and a western sill, the bathymetry of the BFZ shapes a cyclonic circulation along which the ISOW layer is homogenised. The largest changes in ISOW properties are however observed downstream of the western sill, at the exit of the BFZ. There, ISOW is mixed isopycnally with comparatively fresher ISOW from the Irminger Sea and lies over denser ISOW that entered the Irminger Sea south of the BFZ. These fresher ISOW result from the erosion of the ISOW core by mixing with inflows from the interior of the Irminger Sea as ISOW flows northward from the Charlie-Gibbs Fracture Zone. Hence, our analysis reveals the key role of the BFZ through-flow in compensating these inputs of fresh inflows along the northward Irminger Current. 
PY 2022
PD JUN
SO Ocean Science
SN 1812-0784
PU European Geosciences Union (EGU)
VL 18
IS 4
UT 000825495500001
BP 1055
EP 1071
DI 10.5194/os-18-1055-2022
ID 87921
ER

EF