FN Archimer Export Format
PT J
TI Trends and transport variability of the circulation in the subpolar eastern North Atlantic
BT 
AF Nowitzki, Hannah
   Rhein, Monika
   Roessler, Achim
   Kieke, Dagmar
   Mertens, Christian
AS 1:1,2;2:1,2;3:1,2;4:1,2;5:1;
FF 1:;2:;3:;4:;5:;
C1 Institute of Environmental Physics University of Bremen Bremen, Germany
   MARUM – Center for Marine Environmental Sciences University of Bremen Bremen ,Germany
C2 UNIV BREMEN, GERMANY
   UNIV BREMEN MARUM, GERMANY
IF 3.938
TC 6
UR https://archimer.ifremer.fr/doc/00676/78778/80959.pdf
LA English
DT Article
CR OVIDE 2018
BO Thalassa
AB The North Atlantic Current is the major pathway for warm and saline water from the subtropics into the subpolar North Atlantic. Its main branch crosses 47°/48°N in the western North Atlantic basin and further north the Mid‐Atlantic Ridge (MAR) before entering the eastern subpolar basin where it partly feeds the subpolar gyre. To quantify the meridional exchange of water between the subtropical and subpolar regime in the interior eastern North Atlantic, long‐term (1993 to 2017) transport time series were calculated by combining data from inverted echo sounders taken in 2016 to 2017 with the dynamic topography from satellite altimetry. The data reveal an additional more direct pathway from the south across 47°/48°N with a mean northward transport of 9.1 Sv ± 0.8 Sv contributing about 22% to the total inflow of 41.4 Sv into the eastern subpolar basin. The transport time series of this pathway is significantly anticorrelated to the zonal transport across the MAR (R = ‐0.7), damping the interannual variability of the total transport into the subpolar eastern North Atlantic. Moreover, for the meridional transport in the interior eastern basin, a positive trend of 2.0 Sv ± 1.5 Sv per decade is found, partly balancing the negative decadal trend of ‐6.0 Sv ± 5.7 Sv observed in the interior western basin. Plain Language Summary Within the North Atlantic Current, warm and salty water is transported from the subtropics into the subpolar North Atlantic. The well‐studied main branch of this ocean current crosses the latitude of 47°/48°N in the western North Atlantic, turns eastward further north and crosses the Mid‐Atlantic Ridge (MAR), before entering the eastern subpolar basin. By combining data from moored instruments with satellite observations, we calculate how much water is transported north‐ and southward across 47°/48°N in the interior eastern basin. In addition to the well‐known pathway into the subpolar eastern basin crossing the MAR further north, our data reveal a more direct pathway from the south crossing 47°/48°N in the eastern basin. This pathway contributes 22% to the total inflow into the subpolar eastern basin. The two pathways into the eastern subpolar basin are anticorrelated: the strength of the flow across the MAR decreases when the northward flow in the eastern basin across 47°/48°N increases and vice versa. Moreover, the northward flow across 47°/48°N in the interior eastern basin has increased since 1993 while the flow across 47°/48°N in the western basin has decreased. 
PY 2021
PD FEB
SO Journal Of Geophysical Research-oceans
SN 2169-9275
PU American Geophysical Union (AGU)
VL 126
IS 2
UT 000624429800032
DI 10.1029/2020JC016693
ID 78778
ER

EF