Sensitivity of the sea circulation to the atmospheric forcing in the Sicily Channel

Omrani, Hiba; Arsouze, Thomas; Béranger, Karine; Boukthir, Moncef; Drobinski, Philippe; Lebeaupin-Brossier, Cindy; Mairech, Hanen

doi:10.1016/j.pocean.2015.10.007

Cited by 11 publications

(9 citation statements)

References 49 publications

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“…3c) shows a large mesoscale variability with coastal jets, gyres, meanders, and filaments (Poulain and Zambianchi, 2007;Ciappa, 2009). These structures are generated by perturbations induced by tidal, inertial, gravity, surface and continental shelf waves, and nonlinear interactions with bathymetry and/or by synoptic-scale atmospheric forcing and local wind regimes (Hamad et al, 2006;Omrani et al, 2016). Several eddies are supposed to be present regularly like the cyclonic eddy south-west of Sicily (Adventure Bank Vortex, ABV hereafter; Sorgente et al, 2011) and the anticyclonic Sorgente gyre north of the Libyan coast, also visible here.…”

Section: Oceanic Conditionsmentioning

confidence: 87%

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 Conditionsmentioning

confidence: 87%

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

Bouin

Brossier

2020

Ocean Sci.

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“…The number of groups to be obtained in CA is user‐defined (Tibshirani et al, ; Jain, ; Debatty et al, ). To determine the initial number of clusters the elbow method (Thorndike, ; Ketchen and Shook, ; Omrani et al, ) is applied to hierarchical Ward clusters which gives the number of initial groups (Aran et al, ; Peña et al, ).…”

Section: Methodsmentioning

confidence: 99%

Key features of cold‐air pool episodes in the northeast of the Iberian Peninsula (Cerdanya, eastern Pyrenees)

Miró

Peña

Pepin

et al. 2017

Intl Journal of Climatology

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The aim of this research was to detect cold‐air pool (CAP) days during winter and quantify the synoptic situations that produce decoupling between free air and valley bottom temperatures in the Cerdanya basin in the eastern Pyrenees (Spain). Patterns prone to CAP (see figure) are defined by an anticyclonic ridge over the Iberian Peninsula and absence of surface wind in Cerdanya, especially in December and January. Warm air advection from the south is also associated with some of the patterns.

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“…3c) shows a large mesoscale variability with coastal jets, gyres, meanders and filaments (Poulain and Zambianchi, 2007;Ciappa, 2009). These structures are generated by perturbations induced by tidal, inertial, gravity, surface and continental shelf waves and non-linear interactions with bathymetry and/or by synoptic scale atmospheric forcing and local wind regimes (Hamad et al, 2006;Omrani et al, 2016). Several eddies are supposed to be present regularly like the cyclonic eddy south west of Sicily (Adventure Bank Vortex, ABV hereafter, (Sorgente et al, 2011)) and the anticyclonic Sorgente Gyre north of the Libyan coasts, also visible here.…”

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.

show abstract

Sensitivity of the sea circulation to the atmospheric forcing in the Sicily Channel

Cited by 11 publications

References 49 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

Key features of cold‐air pool episodes in the northeast of the Iberian Peninsula (Cerdanya, eastern Pyrenees)

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

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