Consulta: creatorFacets:"Veitch, Jennifer"
Registros recuperados: 4
Data/hora: 13/06/2024 07:09:10

Enhanced vertical mixing in coastal upwelling systems driven by diurnal-inertial resonance: numerical experiments
Provedor de dados: 5
Autores: Fearon, Giles; Herbette, Steven; Veitch, Jennifer; Cambon, Gildas; Lucas, Andrew J.; Lemarié, Florian; Vichi, Marcello.
The land‐sea breeze is resonant with the inertial response of the ocean at the critical latitude of 30°N/S. 1D‐vertical numerical experiments were undertaken to study the key drivers of enhanced diapycnal mixing in coastal upwelling systems driven by diurnal‐inertial resonance near the critical latitude. The effect of the land boundary was implicitly included in the model through the `Craig approximation' for first order cross‐shore surface elevation gradient response. The model indicates that for shallow water depths (&lt;~100~m), bottom shear stresses must be accounted for in the formulation of the ‘Craig approximation’, as they serve to enhance the cross‐shore surface elevation gradient response, while reducing shear and mixing at the thermocline. The...
Tipo: Text
Palavras-chave: Inertial oscillations&lt; /AUTHOR_KEYWORD&gt; Land-sea breeze&lt; /AUTHOR_KEYWORD&gt; Diurnal-inertial resonance&lt; /AUTHOR_KEYWORD&gt; Coastal upwelling&lt; /AUTHOR_KEYWORD&gt; Diapycnal mixing&lt; /AUTHOR_KEYWORD&gt; Phytoplankton blooms&lt; /AUTHOR_KEYWORD&gt.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00643/75507/76384.pdf

Shelf-edge jet currents in the southern Benguela: a modelling approach
Provedor de dados: 5
Autores: Veitch, Jennifer; Hermes, Juliet; Lamont, Tarron; Penven, Pierrick; Dufois, Francois.
The dynamics and seasonal variability of jet currents on the southern Benguela shelf-edge are investigated using a climatologically forced ROMS model. The jet is primarily forced by the intense horizontal gradients that exist across the southern Benguela shelf. These gradients are set up by nearshore cooling via the strongly seasonal upwelling regime and variable offshore warming by the advection of Agulhas waters. While the nearshore cooling is prevalent only during the spring and summer upwelling season, the offshore warming exists throughout the year. As a result intensified geostrophically adjusted currents exist throughout the year, particularly off the Cape Peninsula and Cape Columbine. However, the distinct shelf-edge jet features are most intense...
Tipo: Text
Palavras-chave: Southern Benguela; Shelf-edge jet; Numerical model.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00403/51401/51976.pdf

Lagrangian pathways in the southern Benguela upwelling system
Provedor de dados: 5
Autores: Ragoasha, Natalie; Herbette, Steven; Cambon, Gildas; Veitch, Jennifer; Reason, Chris; Roy, Claude.
The effect of ocean currents on fish eggs and larvae during their journey from spawning to nursery grounds in the Southern Benguela upwelling system is poorly understood. The survival and successful transport of fish eggs and larvae results from complex biological and physical processes. This study focuses on the advective processes, more specifically on how the dynamics and characteristics of the ocean currents shape the Lagrangian pathways in the Southern Benguela. A mesoscale eddy resolving interannual (1989–2010) simulation of the region, with a horizontal resolution of 7.5 km, is used to study processes impacting the connectivity between the western edge of the Agulhas Bank and the west coast upwelling region. A set of Lagrangian experiments are...
Tipo: Text
Palavras-chave: Benguela; Upwelling; Alongshore connectivity; Lagrangian pathways; Coastal jet; Poleward undercurrent.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00487/59904/63085.pdf

Assessment of an environmental barrier to transport of ichthyoplankton from the southern to
Provedor de dados: 20
Autores: Lett, Christophe; Veitch, Jennifer; Van der Lingen, Carl D.; Hutchings, Larry.
The Lüderitz upwelling cell and Orange River cone (LUCORC) area, a transboundary region between South Africa and Namibia, is considered to be an environmental barrier to transport of ichthyoplankton from the southern to the northern Benguela upwelling ecosystems. We use environmental data and modelling to assess the potential mechanisms responsible for this barrier: environmental data were extracted from the 1 × 1° World Ocean Atlas 2001 database and used to build maps of annual mean salinity, temperature, chlorophyll, dissolved oxygen and nutrient concentrations; outputs of a regional circulation model were used in an individual-based model to assess the transport of passive particles from the southern to the northern Benguela. The data show no clear...
Tipo: Journal Contribution
Palavras-chave: Ichthyoplankton; Upwelling; Modelling; Coastal oceanography; Trade winds; Salinity; Hydrodynamics; Cartesian coordinates; Chlorophylls.
Ano: 2007
URL: http://hdl.handle.net/1834/4667