Mesoscale Eddies in the Algerian Basin: do they differ as a function of their formation site?

Pessini, Federica; Olita, Antonio; Cotroneo, Yuri; Perilli, Angelo

doi:10.5194/os-2017-93

Cited by 8 publications

(11 citation statements)

References 38 publications

(72 reference statements)

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“…The strongest peaks of EKE were reached in 1998 and 2017, with values above 450 cm 2 /s 2 and 680 cm 2 /s 2 respectively. These high values of EKE are comparable to the maximum values reached in the most energetic areas of the Mediterranean Sea (Pujol and Larnicol, 2005) such as the Alboran Gyres showing values larger than 600 cm 2 /s 2 (Juza et al., 2016b), the Algerian basin (maxima around 350 cm 2 /s 2 , Pessini et al., 2018) and the Ierapetra Eddy with maximum EKE over 500 cm 2 /s 2 (Amitai et al., 2010).…”

Section: Identification and Evolution Of Long‐lived Eddies In The Bssupporting

confidence: 72%

Strong Long‐Lived Anticyclonic Mesoscale Eddies in the Balearic Sea: Formation, Intensification, and Thermal Impact

et al. 2022

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Section: Identification and Evolution Of Long‐lived Eddies In The Bssupporting

confidence: 72%

Strong Long‐Lived Anticyclonic Mesoscale Eddies in the Balearic Sea: Formation, Intensification, and Thermal Impact

et al. 2022

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“…The first area concerned in the Algerian basin corresponds to the detachment and the recirculation area of long‐lived anticyclones named Algerian eddies (Escudier et al, ; Garreau et al, ; Pessini et al, ). These large mesoscale anticyclones, which are formed by the meanders of the Algerian Current, are generally considered to have small Rossby numbers and satisfy the geostrophic balance.…”

Section: Cyclostrophic Corrections Of Mesoscale Eddies In the Meditermentioning

confidence: 99%

Cyclostrophic Corrections of AVISO/DUACS Surface Velocities and Its Application to Mesoscale Eddies in the Mediterranean Sea

et al. 2019

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Mesoscale eddies, having a characteristic radius equal or larger than the local deformation radius, are generally considered to be geostrophic. Even if this is true for most of them, there are few cases where the ageostrophic velocity components induced by the local curvature of the streamlines are not negligible. In order to account for this ageostrophic part, we investigate the performance of an optimized iterative method which computes the cyclostrophic corrections starting from the geostrophic surface velocity of the AVISO (Archiving, Validation and Interpretation of Satellite Oceanographic data)/DUACS (Data Unification and Altimeter Combination System). We optimized the convergence of the iterative method using an intermediate cubic interpolation. The performance and the accuracy of the optimized iterative method is first evaluated on idealized eddies for which we can obtain their exact cyclogeostrophic solution. Mesoscale eddies of various shapes, intensities and different ellipticity are investigated. The iterative method is then applied to 15 years (2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015) of AVISO/DUACS geostrophic velocity fields, gridded at 1/8 o for the Mediterranean Sea. We found that these ageostrophic corrections are needed for most of the mesoscale anticyclones that have a geostrophic vortex Rossby number larger than Ro > 0.1. Both the Alboran and the Ierapetra eddies are frequently affected by the cyclostrophic corrections that may exceed 50 cm s −1 . Lastly, the corrected velocity fields are compared with available in situ observations of velocity measurements (vessel-mounted acoustic Doppler current profilers) performed within the Ierapetra eddy confirming the benefit of the proposed method.

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“…According to previous studies, there are no permanent hydrodynamic structures in the Mediterranean Sea, since seasonal and interannual variation affects the movement of the water surfaces and the distribution of microplastics (Cózar et al, 2015), thus substantially preventing the formation of permanent accumulation features, although local retention of floating plastics in mesoscale eddies forming off-shore along the Algerian continental shelf has been suggested by previous studies Pessini et al, 2018).…”

Section: Seasonal Changes In the Spatial Distribution Of Microplasticsmentioning

confidence: 90%

Seasonal variation of microplastics density in Algerian surface waters (South-Western Mediterranean Sea)

et al. 2021

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Coastal waters worldwide are widely contaminated with various-size plastics, whose presence in aquatic ecosystems has been shown to produce a wide range of economic and social impacts and harmful effects on marine ecosystems. While microplastics have been reported from many regions of the Mediterranean Sea, very few data exist regarding microplastics concentration in Algerian waters. In this study, we used a Manta trawl (330 µm) at six sampling stations in Bou-Ismail Bay, Algeria (South-West Mediterranean Sea) in order to provide novel information about the occurrence and composition of microplastics along the Algerian coast. Sampling was performed seasonally at six different sampling stations in 2018, providing additional information about the spatio-temporal variability of microplastics concentrations at the sea surface. Microplastics were found in all collected samples, with highly variable concentrations of 0.95, 0.88, 1.26, and 0.36 items/m3 in Autumn, Winter, Spring and Summer, respectively, and an overall mean concentration of 0.86 ± 0.35 items/m3. A classification based on the shape and appearance of microplastics indicated the predominance of fibers (32%), followed by fragments (27%), films (16%), foams (13%), and granules (12%). A qualitative microplastics analysis through Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR) revealed that microplastics were mainly composed of polyethylene (68.2%), polypropylene (24.7%), polystyrene (4.1%) and other polymers (3%). These data provide an initial overview of the quantity, characteristics, and spatio-temporal distribution of floating microplastics in Bou-Ismail Bay (Algeria).

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Mesoscale Eddies in the Algerian Basin: do they differ as a function of their formation site?

Cited by 8 publications

References 38 publications

Strong Long‐Lived Anticyclonic Mesoscale Eddies in the Balearic Sea: Formation, Intensification, and Thermal Impact

Strong Long‐Lived Anticyclonic Mesoscale Eddies in the Balearic Sea: Formation, Intensification, and Thermal Impact

Cyclostrophic Corrections of AVISO/DUACS Surface Velocities and Its Application to Mesoscale Eddies in the Mediterranean Sea

Seasonal variation of microplastics density in Algerian surface waters (South-Western Mediterranean Sea)

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