The mediterranean overflow in the Gulf of Cadiz: a rugged journey

The pathways and transformations of dense water overflows, which depend on small-scale interactions between flow dynamics and erosional-depositional processes, are a central piece in the ocean's large-scale circulation. A novel, high-resolution current and hydrographic data set highlights the i...

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Bibliographic Details
Published in:Science Advances
Main Authors: Sanchez-Leal, Ricardo F., Jesus Bellanco, Maria, Miguel Fernandez-Salas, Luis, Garcia-Lafuente, Jesus, Gasser-Rubinat, Marc, Gonzalez-Pola, Cesar, Hernandez-Molina, Francisco J., Pelegri, Josep L., Peliz, Alvaro, Relvas, Paulo, Roque, David, Ruiz-Villarreal, Manuel, Sammartino, Simone, Carlos Sanchez-Garrido, Jose
Format: Article in Journal/Newspaper
Language:English
Published: American Association for the Advancement of Science 2017
Subjects:
North-Atlantic
Outflow
Gibraltar
Strait
Ocean
Water
Channel
Variability
Velocity
Currents
North Atlantic
Online Access:http://hdl.handle.net/10400.1/11763
https://doi.org/10.1126/sciadv.aao0609
Description
Summary:The pathways and transformations of dense water overflows, which depend on small-scale interactions between flow dynamics and erosional-depositional processes, are a central piece in the ocean's large-scale circulation. A novel, high-resolution current and hydrographic data set highlights the intricate pathway travelled by the saline Mediterranean Overflow as it enters the Atlantic. Interaction with the topography constraints its spreading. Over the initial 200 km west of the Gibraltar gateway, distinct channels separate the initial gravity current into several plunging branches depth-sorted by density. Shallow branches follow the upper slope and eventually detach as buoyant plumes. Deeper branches occupy mid slope channels and coalesce upon reaching a diapiric ridge. A still deeper branch, guided by a lower channel wall marked by transverse furrows, experiences small-scale overflows which travel downslope to settle at mid-depths. The Mediterranean salt flux into the Atlantic has implications for the buoyancy balance in the North Atlantic. Observations on how this flux enters at different depth levels are key to accurately measuring and understanding the role of Mediterranean Outflow in future climate scenarios. project INGRES3 [CTM2010-21229]; project STOCA (IEO); project PESCADIZ (IEO); project INDEMARES [LIFE07 NAT/E/000732+]; project MOC2 [CTM2008-06438-C02-01]; project MED-OUTFLOW [CTM2008-03422-E/MAR, CTM2010-11488-E]; project PELCOSAT (IEO); project SEMANE; project DILEMA [CTM2014-59244-C3-2-R]; project INPULSE [CTM2016-75129-C3-1-R]; SISMER data center; PANGEA data center; IEO data center; ICES data center; BODC data center; NOAA data center; CONTOURIBER project [CTM2008-06399-C04-01/MAR] info:eu-repo/semantics/publishedVersion

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