Consulta: subjectFacets:"Circulation model"
Registros recuperados: 4
Data/hora: 01/06/2024 17:40:04

Seasonal and intraseasonal biogeochemical variability in the thermocline ridge of the southern tropical Indian Ocean
Provedor de dados: 5
Autores: Resplandy, L.; Vialard, Jerome; Levy, M.; Aumont, Olivier; Dandonneau, Y.
The Sea-viewing Wide Field-of-view Sensor (SeaWiFS) time series shows high variability of surface chlorophyll at seasonal and intraseasonal time scales in the oligotrophic southern tropical Indian Ocean thermocline ridge called the Seychelles-Chagos thermocline ridge (SCTR). The SCTR is characterized by an open ocean upwelling due to local Ekman pumping, which annually maintains the mixed layer (ML) shallow and is responsive to atmospheric forcing and in particular to the Madden-Julian Oscillation (MJO) at an intraseasonal time scale. Here we present an overview of SCTR biogeochemistry and investigate the physical processes driving the response observed at seasonal and intraseasonal time scales. Using satellite observations and biophysical ocean...
Tipo: Text
Palavras-chave: Madden julian oscillation; Arabian sea; Rossby waves; Interannual variability; Circulation model; Monsoon; Temperature; Perturbations; Nutrients; Dynamics.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00185/29630/27994.pdf

Contourite identification along Italian margins: The case of the Portofino drift (Ligurian Sea)
Provedor de dados: 5
Autores: Cattaneo, Antonio; Miramontes, Elda; Samalens, Kevin; Garreau, Pierre; Caillaud, Matthieu; Marsset, Bruno; Corradi, Nicola; Migeon, Sebastien.
A brief review of the published evidence of current deposits around Italy is the occasion to test the robustness of matching bottom current velocity models and seafloor morphologies to identify contourite drifts not yet documented. We present the result of the regional hydrodynamic model MARS3D in the Northern Tyrrhenian and Ligurian Sea with horizontal resolution of 1.2 km and 60 levels with focus on bottom current: data are integrated over summer and winter 2013 as representative of low and high intensity current conditions. The Eastern Ligurian margin is impacted by the Levantine Intermediate Water (LIW) with modeled mean velocity of bottom current up to 20 cm s−1 in winter 2013 and calculated bottom shear stress exceeding 0.2 N m−2 in water depth of...
Tipo: Text
Palavras-chave: Sediment drift; Circulation model; Bottom current velocity; Levantine Intermediate Water; Submarine landslide; Mediterranean.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00378/48977/49394.pdf

Modeling of the bottom water flow through the Romanche Fracture Zone with a primitive equation model - Part I: Dynamics
Provedor de dados: 5
Autores: Ferron, Bruno; Mercier, Herle; Treguier, Anne-marie.
This paper investigates the dynamics of the Antarctic Bottom Water (AABW) flow through the Romanche Fracture Zone (RFZ) in a primitive equation model with a high horizontal and vertical resolution. Two examples of Rows over simple bathymetries show that a reduced gravity model captures the essential dynamics of the primitive equation model. The reduced gravity model is then used as a tool to identify what are the bathymetric structures (sills, narrows) that mostly constrain the AABW flow through the RFZ. When only these structures are represented in the primitive equation model, the AABW how is shown to be coherent with observations (transports, density and velocity structures).
Tipo: Text
Palavras-chave: Circulation model; Fracture zone; Bottom water; Bathymetry.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-802.pdf

A spatially explicit ecosystem model of seston depletion in dense mussel culture
Provedor de dados: 5
Autores: Grant, J; Bacher, Cedric; Cranford, P; Guyondet, T; Carreau, M.
A fully-coupled biological-physical-chemical model of a coastal ecosystem was constructed to examine the impact of suspended mussel culture on phytoplankton biomass in Tracadie Bay, Prince Edward Island, Canada. Due to the extent of mussel culture there, we hypothesised that shellfish filtration would control the concentration and distribution of phytoplankton and other suspended particles in the bay. Circulation was delineated with a tidally-driven 2D numerical model and used to drive an ecosystem model with a focus on pelagic components including phytoplankton production, nutrients, detritus, and mussels. The benthos were treated as a sink. Nutrients and seston were forced by tidal exchange and river input, with phytoplankton additionally forced by...
Tipo: Text
Palavras-chave: Towed sensors; Nutrient dynamics; Circulation model; Phytoplankton; Carrying capacity; Shellfish aquaculture; Estuaries; Ecosystem model.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6951.pdf