Water Masses Exchanges Within Boughrara Lagoon-Gulf of Gabes System (Southeastern Tunisia)

Ismail, Sana Ben; Chevalier, Cristèle; Atoui, Abdelfatteh; Devenon, Jean‐Luc; Sammari, Chérif; Pagano, Marc

doi:10.1007/978-3-319-70548-4_461

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…The sea surface height (SSH) is a prognostic variable solved thanks to the filtered free-surface scheme of Roullet and Madec (2000). A no-slip lateral boundary condition is applied, and the bottom friction is parameterized by a quadratic function with a coefficient depending on the 2D mean tidal energy (Lyard et al, 2006;Beuvier et al, 2012). The diffusion is applied along iso-neutral surfaces for the tracers using a Laplacian operator with the horizontal eddy diffusivity value ν h of 30 m 2 s −1 .…”

Section: Oceanic Modelmentioning

confidence: 99%

Impact of a medicane on the oceanic surface layer from a coupled, kilometre-scale simulation

Bouin

Brossier

2020

Ocean Sci.

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Abstract. A kilometre-scale coupled ocean–atmosphere numerical simulation is used to study the impact of the 7 November 2014 medicane on the oceanic upper layer. The processes at play are elucidated through analyses of the tendency terms for temperature and salinity in the oceanic mixed layer. While comparable by its maximum wind speed to a Category 1 tropical cyclone, the medicane results in a substantially weaker cooling. As in weak to moderate tropical cyclones, the dominant contribution to the surface cooling is the surface heat fluxes with secondary effects from the turbulent mixing and lateral advection. Upper-layer salinity decreases due to heavy precipitation that overcompensates the salinizing effect of evaporation and turbulent mixing. The upper-layer evolution is marked by several features believed to be typical of Mediterranean cyclones. First, strong, convective rain occurring at the beginning of the event builds a marked salinity barrier layer. As a consequence, the action of surface forcing is favoured and the turbulent mixing dampened with a net increase in the surface cooling as a result. Second, due to colder surface temperature and weaker stratification, a cyclonic eddy is marked by a weaker cooling opposite to what is usually observed in tropical cyclones. Third, the strong dynamics of the Strait of Sicily enhance the role of the lateral advection in the cooling and warming processes of the mixed layer.

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Section: Oceanic Modelmentioning

confidence: 99%

Impact of a medicane on the oceanic surface layer from a coupled, kilometre-scale simulation

Bouin

Brossier

2020

Ocean Sci.

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“…1). Continental shelf waters are known to be significantly more sensitive to atmospheric conditions (Béjaoui et al, 2019) with wind-induced mixing that quickly homogenizes the water column, and salinity reacting instantaneously to evaporation, runoff or heavy rain (Ismail et al, 2017).…”

Section: Oceanic Conditionsmentioning

confidence: 99%

Impact of a medicane on the oceanic surface layer from a coupled, kilometre-scale simulation

Bouin¹,

Brossier²

2020

Preprint

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Abstract. A kilometre-scale coupled ocean-atmosphere numerical simulation is used to study the impact of the 7 November 2014 medicane on the oceanic upper layer. The processes at play are elucidated through analyses of the tendency terms for temperature and salinity in the oceanic mixed layer. Whereas comparable by its maximum wind speed to a Category 1 tropical cyclone, the medicane results in a substantially weaker cooling. As in weak to moderate tropical cyclones, the dominant contribution to the surface cooling is the surface heat fluxes, with secondary effects from the turbulent mixing and lateral advection. Upper-layer salinity decreases due to heavy precipitation that overcompensates the salinizing effect of evaporation and turbulent mixing. The upper-layer evolution is marked by several features believed to be typical of Mediterranean cyclones. First, strong, convective rain occurring at the beginning of the event build a marked salinity barrier layer. As a consequence, the action of surface forcing is favoured and the turbulent mixing dampened, with a net increase of the surface cooling as result. Second, due to colder surface temperature and weaker stratification, a cyclonic eddy is marked by a weaker cooling, oppositely to what is usually observed in tropical cyclones. Third, the strong dynamics of the Sicily Strait enhances the role of the lateral advection in the cooling and warming processes of the mixed layer.

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“…dilution) or indirect (zooplankton retention) roles of the tidal hydrodynamics on the high resilience capacity of this ecosystem. Previously published results from the COZOMED-MERMEX project have shown the importance of the hydrodynamics in driving certain important ecological features of the Boughrara lagoon: heterogeneous water renewal between zones (Attoui et al, 2020), control of the salinity level inside the lagoon compensating high evaporation (Ben Ismail et al, 2017), accumulation of organic matter inside the lagoon (Ciglenečki et al, 2020), control of toxic algal blooms through control of the distribution of dinoflagellate cysts (Abdelmouleh et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Zooplankton abundance and community structure driven by tidal currents in a Mediterranean coastal lagoon (Boughrara, Tunisia, SW Mediterranean Sea)

Belkahia

Pagano

Chevalier

et al. 2021

Estuarine, Coastal and Shelf Science

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Water Masses Exchanges Within Boughrara Lagoon-Gulf of Gabes System (Southeastern Tunisia)

Cited by 4 publications

References 2 publications

Impact of a medicane on the oceanic surface layer from a coupled, kilometre-scale simulation

Impact of a medicane on the oceanic surface layer from a coupled, kilometre-scale simulation

Impact of a medicane on the oceanic surface layer from a coupled, kilometre-scale simulation

Zooplankton abundance and community structure driven by tidal currents in a Mediterranean coastal lagoon (Boughrara, Tunisia, SW Mediterranean Sea)

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