scholarly journals Surface Salinity in the North Atlantic Subtropical Gyre During the STRASSE/SPURS Summer 2012 Cruise

Oceanography ◽  
2015 ◽  
Vol 28 (1) ◽  
pp. 114-123 ◽  
Author(s):  
Gilles Reverdin ◽  
◽  
Simon Morisset ◽  
Louis Marieé ◽  
Denis Bourras ◽  
...  
Keyword(s):  
North Atlantic ◽  
Subtropical Gyre ◽  
Surface Salinity ◽  
The North ◽  
The North Atlantic

scholarly journals North Atlantic Subtropical Underwater and Its Year-to-Year Variability in Annual Subduction Rate during the Argo Period

2016 ◽  
Vol 46 (6) ◽  
pp. 1901-1916 ◽  
Author(s):  
Tangdong Qu ◽  
Linlin Zhang ◽  
Niklas Schneider
Keyword(s):  
North Atlantic ◽  
Mixed Layer Depth ◽  
Subtropical Gyre ◽  
Sea Surface Salinity ◽  
Surface Salinity ◽  
The North ◽  
The Mean ◽  
The North Atlantic ◽  
Subtropical Underwater ◽  
Subduction Rate

AbstractSubtropical underwater (STUW) and its year-to-year variability in annual subduction rate are investigated using recently available Argo data in the North Atlantic. For the period of observation (2002–14), the mean annual subduction rate of the STUW is 7.3 ± 1.2 Sv (1 Sv = 106 m3 s−1) within the density range between 25.0 and 26.0 kg m−3. Once subducted, the STUW spreads in the subtropical gyre as a vertical salinity maximum. In the mean, the spatial changes in temperature and salinity of the STUW tend to compensate each other, and the density of the water mass remains rather stable near 25.5 kg m−3 in the southwestern part of the subtropical gyre. The annual subduction rate of the STUW varies from year to year, and most of this variability is due to lateral induction, which in turn is directly linked to the variability of the winter mixed layer depth. Through modulation of surface buoyancy, wind anomalies associated with the North Atlantic Oscillation are primarily responsible for this variability. Sea surface salinity anomalies in the formation region of the STUW are conveyed into the thermocline, but their westward propagation cannot be detected by the present data.

Subpolar Gyre – AMOC – Atmosphere Interactions on Multidecadal Timescales in a Version of the Kiel Climate Model

2021 ◽  
Author(s):  
Jing Sun ◽  
Mojib Latif ◽  
Wonsun Park
Keyword(s):  
North Atlantic ◽  
Climate Model ◽  
Deep Convection ◽  
Meridional Overturning Circulation ◽  
Subpolar Gyre ◽  
Surface Salinity ◽  
The North ◽  
Ocean Coupling ◽  
Meridional Overturning ◽  
The North Atlantic

<p>There is a controversy about the nature of multidecadal climate variability in the North Atlantic (NA) region, concerning the roles of ocean circulation and atmosphere-ocean coupling. Here we describe NA multidecadal variability from a version of the Kiel Climate Model, in which both subpolar gyre (SPG)-Atlantic Meridional Overturning Circulation (AMOC) and atmosphere-ocean coupling are essential. The oceanic barotropic streamfuntions, meridional overturning streamfunctions, and sea level pressure are jointly analyzed to derive the leading mode of Atlantic variability. This mode accounting for about 23.7 % of the total combined variance is oscillatory with an irregular periodicity of 25-50 years and an e-folding time of about a decade. SPG and AMOC mutually influence each other and together provide the delayed negative feedback necessary for maintaining the oscillation. An anomalously strong SPG, for example, drives higher surface salinity and density in the NA’s sinking region. In response, oceanic deep convection and AMOC intensify, which, with a time delay of about a decade, reduces SPG strength by enhancing upper-ocean heat content. The weaker gyre circulation leads to lower surface salinity and density in the sinking region, which eventually reduces deep convection and AMOC strength. There is a positive ocean-atmosphere feedback between the sea surface temperature and low-level atmospheric circulation over the Southern Greenland area, with related wind stress changes reinforcing SPG changes, thereby maintaining the (damped) multidecadal oscillation against dissipation. Stochastic surface heat-flux forcing associated with the North Atlantic Oscillation drives the eigenmode.</p>

Changes across 66°W, the Caribbean Sea and the Western boundaries of the North Atlantic Subtropical Gyre

2018 ◽  
Vol 168 ◽  
pp. 296-309 ◽  
Author(s):  
M. Casanova-Masjoan ◽  
T.M. Joyce ◽  
M.D. Pérez-Hernández ◽  
P. Vélez-Belchí ◽  
A. Hernández-Guerra
Keyword(s):  
North Atlantic ◽  
Caribbean Sea ◽  
Subtropical Gyre ◽  
The North ◽  
The Caribbean ◽  
The North Atlantic

The spiralling North Atlantic Subtropical Gyre

2020 ◽  
Author(s):  
Kristofer Döös ◽  
Sara Berglund ◽  
Trevor Mcdougall ◽  
Sjoerd Groeskamp
Keyword(s):  
North Atlantic ◽  
Gulf Stream ◽  
Subtropical Gyre ◽  
The South ◽  
Spiral Flow ◽  
The North ◽  
Saline Waters ◽  
Downward Spiral ◽  
Meridional Overturning ◽  
The North Atlantic

<p>The North Atlantic Subtropical Gyre is shown to have a downward spiral flow beneath the mixed layer, where the water slowly gets denser, colder and fresher as it spins around the gyre. This path is traced with Lagrangian trajectories as they enter the Gyre in the Gulf Stream from the south until they exit through the North Atlantic Drift. The preliminary results indicate that these warm, saline waters from the south gradually becomes fresher, colder and denser due to mixing with waters originating from the North Atlantic. There are indications that there is also a diapycnal mixing, in the eastern part of the gyre due to mixing with the saline Mediterranean Waters, which would then be crucial for the Atlantic Meridional Overturning. The mixing in the rest of the gyre is dominated by isopycnic mixing, which transforms gradually the water into colder and fresher water as it spins down the gyre into the abyssal ocean before heading north.</p>

scholarly journals Nine years of mass transport data in the eastern boundary of the North Atlantic Subtropical Gyre

2010 ◽  
Vol 115 (C9) ◽  
Author(s):  
Eugenio Fraile-Nuez ◽  
Francisco Machín ◽  
Pedro Vélez-Belchí ◽  
Federico López-Laatzen ◽  
Rafael Borges ◽  
...  
Keyword(s):  
Mass Transport ◽  
North Atlantic ◽  
Subtropical Gyre ◽  
The North ◽  
Eastern Boundary ◽  
The North Atlantic
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