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  • ASFA15::E::Ekman transport  (1)
  • Hydrodynamic modeling  (1)
  • Inorganic nutrient supply  (1)
  • 1
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 118 (2013): 5844–5857, doi:10.1002/jgrc.20403.
    Description: This study characterizes the seasonal cycle of the Catalan inner-shelf circulation using observations and complementary numerical results. The relation between seasonal circulation and forcing mechanisms is explored through the depth-averaged momentum balance, for the period between May 2010 and April 2011, when velocity observations were partially available. The monthly-mean along-shelf flow is mainly controlled by the along-shelf pressure gradient and by surface and bottom stresses. During summer, fall, and winter, the along-shelf momentum balance is dominated by the barotropic pressure gradient and local winds. During spring, both wind stress and pressure gradient act in the same direction and are compensated by bottom stress. In the cross-shelf direction the dominant forces are in geostrophic balance, consistent with dynamic altimetry data.
    Description: The research leading to these results has received funding from the European Community’s Seventh Framework Programme (FP7/2007/2013) under grant agreement 242284 (Field_ac project).
    Description: 2014-04-25
    Keywords: Momentum balance ; Catalan shelf ; Hydrodynamic modeling ; Seasonal variability
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
    Location Call Number Limitation Availability
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  • 2
    Publication Date: 2021-05-19
    Description: Inorganic nutrients increase with depth as a result of the enhanced remineralization of organic matter with aging waters (the time since they were last near the sea surface), and the opposite happens with dissolved oxygen (except within the saturated surface mixed layer). In the Canary Current Large Marine Ecosystem there is also a marked latitudinal gradient, with the Cape Verde Front separating relatively nutrient-poor and oxygen-rich subtropical waters from the nutrient-rich and oxygen-poor tropical waters. Along a latitudinal band off North-West Africa, coastal upwelling brings the subsurface waters towards the sea surface, locally raising the inorganic nutrient levels. This becomes an important lateral source to both gyres, especially to the nutrient-poor subtropical one, taking place through lateral mixing (mainly as a result of the instability of the coastal-upwelling baroclinic jet) and localized coastal filaments (in those regions, typically capes, where the coastal flow converges and offshore advection takes place). In the southernmost portion of our domain, within tropical waters, there is also high (wind-induced) offshore primary production. This, together with the slow ventilation of the subsurface waters, leads to much enhanced remineralization, producing a region with very low oxygen and high inorganic nutrient levels, the oxygen minimum zone of the North Atlantic Ocean.
    Description: Published
    Keywords: Cape Verde Front ; Inorganic nutrient supply ; Biogeochemical processes ; Spatial distributions ; Oxygen minimum zone ; CCLME
    Repository Name: AquaDocs
    Type: Report Section , Refereed
    Format: pp. 133-142
    Location Call Number Limitation Availability
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  • 3
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    IOC-UNESCO | Paris, France
    Publication Date: 2021-05-19
    Description: North of Cape Blanc, the north-easterly winds cause offshore flow of surface waters that are replaced by subsurface inflow of relatively cold and nutrient-rich waters, driving the vertical cell of coastal upwelling. This vertical circulation, together with surface heating and horizontal mixing, causes the coastal upwelling front (typically about 200 m deep) that separates cold onshore from warm offshore waters. A southward baroclinic coastal jet is associated to this front, which causes vertical shear and mixing that contribute to the intensity of the vertical cell. Very importantly, this jet feeds from upstream waters, resulting in an along-slope coherent flow, or the horizontal cell of coastal upwelling – this is the Canary Upwelling Current (CUC) that connects all surface coastal African waters north of Cape Blanc. Further south, because of the northward offshore flow and the seasonality of the winds, the connection remains only during winter and spring, very close to shelf break and in the top 100 m. North of Cape Blanc, a Poleward Undercurrent (PUC) flows in the relatively homogenous upwelled waters that found over the continental slope. South of Cape Blanc the PUC appears as a nearshore expression of the Mauritania Current. Both the southward CUC and the northward PUC constitute the true skeleton of the Canary Current Large Marine Ecosystem.
    Description: Published
    Keywords: Coastal upwelling ; Recirculation cells ; Canary Upwelling Current ; Poleward Undercurrent ; CCLME ; ASFA15::E::Ekman transport
    Repository Name: AquaDocs
    Type: Report Section , Refereed
    Format: pp. 93-103
    Location Call Number Limitation Availability
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