Eddy measurements, coastal turbulence and statistics in the gulf of Lions

Redondo, J. M.; Matulka, Ania; Platónov, Alexéi Konstantínovich; Sekula, Emil; Fraunié, Philippe

doi:10.5194/osd-10-55-2013

Cited by 7 publications

(10 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Oceanographic investigations in the Ebro River region were focused primarily on the outer shelf and slope dynamics of the southern margin (Font, 1990;Palanques et al, 2002;Salat et al, 2002;Jordà, 2005) with relevant eddy activity (Redondo et al, 2013). The circulation in these regions is dominated by the inertial band, with a relevant signal of the slope current associated with the regional northern current northern or Liguro-Provençal-Catalan current (Jordà, 2005).…”

Section: Study Area and Observationsmentioning

confidence: 99%

Ocean–atmosphere–wave characterisation of a wind jet (Ebro shelf, NW Mediterranean Sea)

Grifoll

Navarro

Pallarés

et al. 2016

Nonlin. Processes Geophys.

View full text Add to dashboard Cite

Abstract. In this contribution the wind jet dynamics in the northern margin of the Ebro River shelf (NW Mediterranean Sea) are investigated using coupled numerical models. The study area is characterised by persistent and energetic offshore winds during autumn and winter. During these seasons, a seaward wind jet usually develops in a ∼ 50 km wide band offshore. The COAWST (Coupled Ocean-Atmosphere-Wave-Sediment Transport) modelling system was implemented in the region with a set of downscaling meshes to obtain high-resolution meteooceanographic outputs. Wind, waves and water currents were compared with in situ observations and remote-sensingderived products with an acceptable level of agreement. Focused on an intense offshore wind event, the modelled wind jet appears in a limited area offshore with strong spatial variability. The wave pattern during the wind jet is characterised by the development of bimodal directional spectra, and the ocean circulation tends to present well-defined twolayer flow in the shallower region (i.e. inner shelf). The outer shelf tends to be dominated by mesoscale dynamics such as the slope current. Due to the limited fetch length, ocean surface roughness considering sea state (wave-atmosphere coupling) modifies to a small extent the wind and significant wave height under severe cross-shelf wind events. However, the coupling effect in the wind resource assessment may be relevant due to the cubic relation between the wind intensity and power.

show abstract

Section: Study Area and Observationsmentioning

confidence: 99%

Ocean–atmosphere–wave characterisation of a wind jet (Ebro shelf, NW Mediterranean Sea)

Grifoll

Navarro

Pallarés

et al. 2016

Nonlin. Processes Geophys.

View full text Add to dashboard Cite

show abstract

“…The wave-limited fetches and the persistent offshore winds represent particular ocean-atmosphere conditions never investigated before from a full-coupling perspective; only energetic cyclogenesis activity and extreme conditions have been recently modelled and investigated (e.g. Warner et al, 2010;Olabarrieta et al, 2012;Renault et al, 2012;Zambon et al, 2014;Ricchi et al, 2016) where also the heat transfer plays a relevant role in the air-sea coupling. In the mentioned cases, extreme modelled waves and wind benefitted from the use of full-coupling systems.…”

Section: Discussionmentioning

confidence: 99%

Section: Study Area and Observationsmentioning

confidence: 99%

“…Warner et al (2010) developed a fully coupled numerical system (COAWST: Coupled Ocean-Atmosphere-Wave-Sediment Transport) to investigate the impact of storms on coastal systems. Using COAWST, Olabarrieta et al (2012) and Renault et al (2012) proved numerically that the waveinduced ocean surface roughness is a key parameter in the air-sea momentum transfer. Under severe storm conditions (hurricanes and cyclones), this parameter influences the spatial and temporal evolution of the meteo-oceanographic variables.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ocean–atmosphere–wave characterization of a wind jet (Ebro shelf, NW Mediterranean Sea)

Grifoll¹,

Navarro²,

Pallarés³

et al. 2016

Preprint

View full text Add to dashboard Cite

Abstract. In this contribution the wind jet dynamics in the northern margin of the Ebro River shelf (NW Mediterranean Sea) are investigated using coupled numerical models. The study area is characterized by persistent and energetic offshore winds during autumn and winter. During these seasons, a seaward wind jet usually develops in a 50 km wide band offshore. The COAWST (Coupled Ocean–Atmosphere–Wave–Sediment Transport) modelling system was implemented in the region with a set of downscaling meshes to obtain high-resolution meteo-oceanographic outputs. Wind, wave and water current were compared with in situ observations and remote-sensing-derived products with an acceptable level of agreement. Focused on an intense offshore wind event, the modelled wind jet appears in a limited area offshore with a strong spatial variability. The wave climate during the wind jet is characterized by the developing of bimodal directional spectra, and the ocean circulation tends to present well-defined two-layer flow in the shallower region (i.e. inner shelf). The outer shelf tends to be dominated by mesoscale dynamics such as the slope current. Despite the limited fetch length, ocean bottom roughness considering sea state (wave-atmosphere coupling) modifies to a small extent the wind and significant wave height under severe cross-shelf wind events. However, the coupling effect in the wind resource assessment may be relevant due to the cubic relation between the wind intensity and power.

show abstract

“…Among the small spatial scales, some consideration have got vortices in the Gulf of Lion observed in satellite synthetic aperture radar (SAR) imagery by Redondo et al (2013). For the entire Westerm Mediterranean, submesoscale eddies manifested in SAR imagery were tackled recently by Karimova and Gade (2016) and Karimova (2017).…”

Section: General Problematicsmentioning

confidence: 99%

Observing Surface Circulation of the Western Mediterranean Basin With Satellite Imagery

Karimova

2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

ABSTRACT:In this article, the benefits of using satellite imagery of different types (namely thermal infrared, visible-range, and synthetic aperture radar (SAR) images) for observing surface circulation of marine basins are being discussed. As a region of interest, we use the Western Mediterranean Basin. At first, the areas with sharpest thermal and chlorophyll-a gradients within the region of interest were defined on a seasonal base using the data provided by Aqua Moderate Resolution Imaging Spectrometer (MODIS). After that, mesoscale eddies were detected using different sea surface temperature (SST) products and, finally, submesoscale vortices were observed with Envisat Advanced SAR imagery. Thus found locations of eddies were compared with locations of the sharpest fronts discovered in the first part of the study, which showed that the biggest, mostly anticyclonic, eddies tended to correspond to locations of main surface currents; smaller cyclonic eddies were mostly attributed to thermal fronts, while submesoscale eddies were distributed quite homogeneous. The observations performed in that way revealed quite prominent basin-, meso-and submesoscale eddy activity in the region of interest. Additionally, significant seasonal variability in the type of surface water stirring was noted. Thus, the maximum of both meso-and submesoscale eddy activity seems to happen during the warm season, while during winter, presumably due to low Richardson numbers typical for the upper water layer, the turbulent features are still undeveloped and of the smaller spatial scale than during the warm period of year.

show abstract

Eddy measurements, coastal turbulence and statistics in the gulf of Lions

Cited by 7 publications

References 17 publications

Ocean–atmosphere–wave characterisation of a wind jet (Ebro shelf, NW Mediterranean Sea)

Ocean–atmosphere–wave characterisation of a wind jet (Ebro shelf, NW Mediterranean Sea)

Ocean–atmosphere–wave characterization of a wind jet (Ebro shelf, NW Mediterranean Sea)

Observing Surface Circulation of the Western Mediterranean Basin With Satellite Imagery

Contact Info

Product

Resources

About