Please use this identifier to cite or link to this item:
Title: The Canary Intermediate Poleward Undercurrent: Not Another Poleward Undercurrent in an Eastern Boundary Upwelling System
Authors: Vélez Belchí,Pedro 
Cainzos Díaz, Verónica 
Romero, E
Casanova Masjoan, Maria 
Arumí Planas, Cristina 
Santana Toscano, Daniel 
González Santana, A.
Pérez Hernández, María Dolores 
Hernández Guerra, Alonso 
UNESCO Clasification: 251007 Oceanografía física
Keywords: Continental shelf/slope
North Atlantic Ocean
Boundary currents
Meridional overturning circulation
Ocean circulation, et al
Issue Date: 2021
El Portal Sudatlántico en la Cinta Transportadora Global 
H2020- INFRADEV- 2018-2020824131 EARISE PROJET
Contribución de las corrientes de contorno del margen este a la variabilidad de la AMOC 
Journal: Journal of Physical Oceanography 
Abstract: Poleward undercurrents are well-known features in eastern boundary upwelling systems. In the California Current upwelling system, the California poleward undercurrent has been widely studied, and it has been demonstrated that it transports nutrients from the equatorial waters to the northern limit of the subtropical gyre. However, in the Canary Current upwelling system, the Canary intermediate poleward undercurrent (CiPU) has not been properly characterized, despite recent studies arguing that the dynamics of the eastern Atlantic Ocean play an important role in the Atlantic meridional overturning circulation, specifically on its seasonal cycle. Here, we use trajectories of Argo floats and model simulations to characterize the CiPU, including its seasonal variability and its driving mechanism. The Argo observations show that the CiPU flows from 26°N, near Cape Bojador, to approximately 45°N, near Cape Finisterre and flows deeper than any poleward undercurrent in other eastern boundaries, with a core at a mean depth of around 1000 dbar. Model simulations manifest that the CiPU is driven by the meridional alongshore pressure gradient due to general ocean circulation and, contrary to what is observed in the other eastern boundaries, is still present at 1000 dbar as a result of the pressure gradient between the Antarctic Intermediate Waters in the south and Mediterranean Outflow waters in the north. The high seasonal variability of the CiPU, with its maximum strength in autumn and minimum in spring, is due to the poleward extension of AAIW, forced by Ekman pumping in the tropics.
ISSN: 0022-3670
DOI: 10.1175/JPO-D-20-0130.1
Source: Journal of Physical Oceanography [ISSN 0022-3670], v. 51(9). p. 2973-2990
Appears in Collections:Artículos
Adobe PDF (3,28 MB)
Show full item record

Page view(s)

checked on Jun 17, 2023


checked on Jun 17, 2023

Google ScholarTM




Export metadata

Items in accedaCRIS are protected by copyright, with all rights reserved, unless otherwise indicated.