scholarly journals Water masses, circulation and transport in the eastern boundary current of the North Atlantic subtropical gyre

2001 ◽  
Vol 65 (S1) ◽  
pp. 177-186 ◽  
Author(s):  
Alonso Hernández-Guerra ◽  
Federico López-Laatzen ◽  
Francisco Machín ◽  
Demetrio De Armas ◽  
J. L. Pelegrí
Keyword(s):  
North Atlantic ◽  
Water Masses ◽  
Subtropical Gyre ◽  
Boundary Current ◽  
The North ◽  
Eastern Boundary ◽  
Eastern Boundary Current ◽  
The North Atlantic

Transport variability in the Lanzarote passage (eastern boundary current of the North Atlantic subtropical Gyre)

2003 ◽  
Vol 50 (2) ◽  
pp. 189-200 ◽  
Author(s):  
Alonso Hernández-Guerra ◽  
Eugenio Fraile-Nuez ◽  
Rafael Borges ◽  
Federico López-Laatzen ◽  
Pedro Vélez-Belchı́ ◽  
...  
Keyword(s):  
North Atlantic ◽  
Subtropical Gyre ◽  
Boundary Current ◽  
The North ◽  
Eastern Boundary ◽  
Eastern Boundary Current ◽  
The North Atlantic

scholarly journals The North Atlantic Glacial Eastern Boundary Current as a Key Driver for Ice‐Sheet—AMOC Interactions and Climate Instability

2021 ◽  
Vol 36 (3) ◽  
Author(s):  
Samuel Toucanne ◽  
Guillaume Soulet ◽  
Natalia Vázquez Riveiros ◽  
Steven M. Boswell ◽  
Bernard Dennielou ◽  
...  
Keyword(s):  
North Atlantic ◽  
Ice Sheet ◽  
Boundary Current ◽  
The North ◽  
Eastern Boundary ◽  
Eastern Boundary Current ◽  
Key Driver ◽  
The North Atlantic

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

Eastern boundary drainage of the North Atlantic subtropical gyre

2012 ◽  
Vol 62 (9) ◽  
pp. 1287-1310 ◽  
Author(s):  
Irene Laiz ◽  
Jose Luis Pelegrí ◽  
Francisco Machín ◽  
Pablo Sangrà ◽  
Alonso Hernández-Guerra ◽  
...  
Keyword(s):  
North Atlantic ◽  
Subtropical Gyre ◽  
The North ◽  
Eastern Boundary ◽  
The North Atlantic

scholarly journals Organic carbon budget for the eastern boundary of the North Atlantic subtropical gyre: major role of DOC in mesopelagic respiration

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Yeray Santana-Falcón ◽  
Xosé Antón Álvarez-Salgado ◽  
María Dolores Pérez-Hernández ◽  
Alonso Hernández-Guerra ◽  
Evan Mason ◽  
...  
Keyword(s):  
Organic Carbon ◽  
North Atlantic ◽  
Carbon Budget ◽  
Subtropical Gyre ◽  
The North ◽  
Eastern Boundary ◽  
The North Atlantic

The North Atlantic Eastern Boundary: Observations from Moorings at Goban Spur 2016-2019

2020 ◽  
Author(s):  
Martin Moritz ◽  
Kerstin Jochumsen ◽  
Dagmar Kieke ◽  
Birgit Klein ◽  
Holger Klein ◽  
...  
Keyword(s):  
Time Series ◽  
North Atlantic ◽  
Water Masses ◽  
Meridional Overturning Circulation ◽  
Altimeter Data ◽  
Depth Range ◽  
The North ◽  
Eastern Boundary ◽  
The North Atlantic ◽  
Goban Spur

<p>Since 2016 a moored observatory is operated at the eastern extension of the “North Atlantic Changes (NOAC)” array at 47°/48°N. This observatory is installed across the shelf break at Goban Spur and consists of two deep-sea moorings that are separated by about 60 km.  </p><p>The aim of this ongoing monitoring program is to quantify the variability and trends in the properties and transport rates of water masses that are advected northwards along the North Atlantic Eastern Boundary and modify the adjacent regions, i.e. the Northwest European Shelf, North Sea, Nordic Seas and Arctic Ocean. Furthermore, the continuous long term time series are essential for a thorough understanding of the circulation system in the eastern North Atlantic and the underlying physical mechanisms that govern its variability.</p><p>Here, we present results of the analysis of temperature, salinity and current velocity time series from 2016 to 2019. These provide a descriptive view of the complex current structure and variability of water masses on daily to intra- and inter-annual time scales.</p><p>The most pronounced signal in the variability of temperature and salinity is caused by the presence of Mediterranean Outflow Water located at about 1000 m depth. During the observation period we find significant positive trends in temperature and salinity in the depth range of 500 to 1500 m. The velocity measurements of the onshore mooring show a northeastward directed mean flow following the topography with along-slope variations, while the flow at the offshore mooring position is more unstable with predominantly cross-slope variations. </p><p>The combination of our observations with float and altimeter data indicates that the presence of eddies and the interaction with the topography seems to play a crucial role for setting the variability of the flow in this region.</p><p>Finally, we present an approach to evaluate the volume fluxes at the eastern boundary that will add toward an integrated estimate of the strength of the Atlantic Meridional Overturning Circulation at 47°/48°N.</p>

From small whirls to the global ocean: how eddies affect the Atlantic Meridional Overturning Circulation

2020 ◽  
Author(s):  
Caroline Katsman ◽  
Nils Brüggemann ◽  
Sotiria Georgiou ◽  
Juan-Manuel Sayol Espana ◽  
Stefanie Ypma ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Water Masses ◽  
Meridional Overturning Circulation ◽  
Global Ocean ◽  
Boundary Current ◽  
The North ◽  
The North Atlantic ◽  
Density Space

<p>In the North Atlantic Ocean, intense downward motions connect the upper and lower limbs of the Atlantic Meridional Overturning Circulation (AMOC). In addition, the AMOC also displays a pronounced signature in density space, with lighter waters moving northward and denser waters returning southward.</p><p>While at first glance it is appealing to associate this sinking of water masses in the North Atlantic Ocean with the occurrence of the formation of dense water masses by deep convection, this is not correct: the net vertical motion over convection areas is small. The downward flow required to connect the upper and lower branches of the AMOC thus has to occur outside the deep convection areas. Indeed, earlier studies have pointed out theoretically that strong sinking can only occur close to continental boundaries, where ageostrophic processes play a role. However, observations clearly indicate that convected water masses formed in marginals seas constitute an important component of the lower limb of the AMOC.</p><p>This apparent contradiction is explored in this presentation, by studying the overturning in the AMOC from a perspective in depth space (Eulerian downwelling) and density space (downwelling across isopycnals). Based on analyses of both a high-resolution global ocean model and dedicated process studies using idealized models we analyze the characteristics of the sinking, of diapycnal mixing, and investigate how these are linked. </p><p>It appears that eddies play a crucial role for the overturning, both in depth space and density space. They control the characteristics of the yearly cycle of convection and restratification, the magnitude of the Eulerian sinking near continental boundaries, and steer the export of dense waters formed in the interior of the marginal seas via the boundary current system.</p><p>These studies thus reveal a complex three-dimensional view on sinking, diapycnal water mass transformation and overturning in the North Atlantic Ocean, involving the boundary current, the interior and interactions with the eddy field.  This implies that it is essential to resolve these eddies to be able to properly represent the overturning in depth and density space in the North Atlantic Ocean and its response to changing conditions in a future climate.</p>

Sign in / Sign up

Export Citation Format

Share Document