A Study of an Intense Density Front in the Eastern Alboran Sea: The Almeria–Oran Front

Tintoré, Joaquı́n; Violette, Paul E. La; Bladé, Ileana; Cruzado, Antonio

doi:10.1175/1520-0485(1988)018<1384:asoaid>2.0.co;2

Cited by 282 publications

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“…In this study the front was found in its usual position as the eastern boundary of the eastern of two Alboran gyres (Tintore et al, 1988;Folkard et al, 1994;Prieur and Sournia, 1994;Allen et al, 2001-this issue). The analysis of temperature and salinity on density surfaces showed Mediterranean Surface Water (MSW) advecting westward along the Spanish Coast until it reached the AlmeriaOran front.…”

Section: Discussionsupporting

confidence: 46%

“…Two anticyclonic gyres form in the Alboran basin, fed by this Atlantic inflow ( Figure 1) (Tintore et al, 1988;Allen et al, 2001-this issue). The eastern Alboran gyre has been known to break down on occasions (Cheney and Doblar, 1982;Perkins et al, 1987;Heburn and La Violette, 1990) and, as many as three gyres have been observed through satellite imagery (Viudez et al, 1998) The convergence of these two water masses causes the MAW to be deflected southward towards Oran (Algeria) along the eastern edge of the Eastern Alboran Gyre, forming a well defined frontal zone (Tintore et al, 1988). Physical and biochemical data indicate that the front is limited to the upper 200 m, with a strong southeastward geostrophic baroclinic jet (Folkard et al, 1994).…”

Section: Introductionmentioning

confidence: 98%

“…Physical and biochemical data indicate that the front is limited to the upper 200 m, with a strong southeastward geostrophic baroclinic jet (Folkard et al, 1994). The secondary ageostrophic circulation associated with instability of the jet is characterised by surface convergence and periodic isopycnal sinking and upwelling (Tintore et al, 1988;Allen et al, 2001-this issue).…”

Section: Introductionmentioning

confidence: 99%

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Mesoscale subduction at the Almeria–Oran front

Fielding

Crisp

Allen

et al. 2001

Journal of Marine Systems

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Section: Discussionsupporting

confidence: 46%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Mesoscale subduction at the Almeria–Oran front

Fielding

Crisp

Allen

et al. 2001

Journal of Marine Systems

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“…As discussed by Tintoré et al (1988), there is a covergence at the northern end of the Almeria-Oran front between the rapid inflow of MAW and a net south-westward flow (10-20 cms -1 ) along the Spanish coast ( Figure 5). The convergence in the surface waters maintains a sharp density gradient at the front and provides a source of potential energy for a baroclinic component to the instability that we will demonstrate in this paper.…”

Section: )mentioning

confidence: 86%

Mesoscale subduction at the Almeria–Oran front

Allen

Smeed

Tintoré

et al. 2001

Journal of Marine Systems

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This paper presents a detailed diagnostic analysis of hydrographic and current meter data from three, rapidly repeated, fine-scale surveys of the Almeria-Oran front.Instability of the frontal boundary, between surface waters of Atlantic and Mediterranean origin, is shown to provide a mechanism for significant heat transfer from the surface layers to the deep ocean in winter. The data were collected during the second observational phase of the EU funded OMEGA project on RRS Discovery cruise 224 during December 1996. High resolution hydrographic measurements using the towed undulating CTD vehicle, SeaSoar,. traced the subduction of Mediterranean Surface Water across the Almeria-Oran front. This subduction is shown to result from a significant baroclinic component to the instability of the frontal jet. The Qvector formulation of the omega equation is combined with a scale analysis to quantitatively diagnose vertical transport resulting from mesoscale ageostrophic circulation. The analyses are presented and discussed in the presence of satellite and airborne remotely sensed data; which provide the basis for a thorough and novel approach to the determination of observational error.

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“…While the Strait of Gibraltar geographically divides the two basins, the Almería-Oran front is thought to be a genetic separation area. This large-scale density front is formed by the convergence of two distinct water masses in the east Alboran Sea, which is located in the westernmost region of the Mediterranean Sea (Tintore et al 1988). Other barriers to gene flow within the Mediterranean may also exist in the form of an east-west divide at the Siculo-Tunisian Strait and/or hydrogeographic isolation of the Aegean, Ionian and Adriatic Seas (Perez-Losada et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Genetic structure of the high dispersal Atlanto-Mediterreanean sea star Astropecten aranciacus revealed by mitochondrial DNA sequences and microsatellite loci

et al. 2009

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Genetic structure of the high dispersal Atlanto-Mediterreanean sea star Astropecten aranciacus revealed by mitochondrial DNA sequences and microsatellite loci AbstractTo investigate the impact of potential marine barriers on gene-flow in high dispersal marine invertebrates, we assessed the population genetic structure of the sea star Astropecten aranciacus. Samples were obtained from nine locations within the Atlantic and the Mediterranean Sea including populations east of the Siculo-Tunisian Strait. We obtained both DNA sequence data of the mitochondrial control region and genotype data at four microsatellite loci. Both markers were highly polymorphic and showed a great level of genetic diversity. Genetic differentiation between populations (F (ST)) was in general low, particularly for nuclear data, as is often the case in high dispersal marine invertebrates. Nevertheless, both marker sets indicated a significant genetic differentiation of the population from the island of Madeira to most other populations. Our results also demonstrate a clear pattern of isolation-by-distance supported by both mitochondrial and nuclear markers. Therefore, we conclude that larval dispersal of A. aranciacus is somewhat limited even within the basins of the Atlantic, the west Mediterranean and the east Mediterranean. Microsatellite loci further revealed genetic differentiation between the three basins; however, it is not clear whether this is truly caused by marine barriers. Genetic differentiation between basins might also be a result of isolation-by-distance allowing for any grouping to be significant as long as geographical neighbors are clustered together. Although levels of genetic differentiation were less pronounced in mirosatellite data, both datasets were coherent and revealed similar patterns of genetic structure in A. aranciacus. 1Genetic structure of the high dispersal Atlanto-Mediterreanean sea star Astropecten aranciacus revealed by mitochondrial DNA sequences and microsatellite loci Deborah E. Zulliger, Samuel Tanner, Markus Ruch and Georg Ribi AbstractTo investigate the impact of potential marine barriers on gene flow in high dispersal marine invertebrates, we assessed the population genetic structure of the sea star Astropecten aranciacus. Samples were obtained from nine locations within the Atlantic and the Mediterranean Sea including populations east of the Siculo-Tunisian Strait. We obtained both DNA sequence data of the mitochondrial control region and genotype data at four microsatellite loci. Both markers were highly polymorphic and showed a great level of genetic diversity. Genetic differentiation between populations (F ST ) was in general low, particularly for nuclear data, as is often the case in high dispersal marine invertebrates. Nevertheless, both marker sets indicated a significant genetic differentiation of the population from the island of Madeira to most other populations. Our results also demonstrate a clear pattern of isolation-by-distance supported by both mitochondrial and nuclear markers. The...

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A Study of an Intense Density Front in the Eastern Alboran Sea: The Almeria–Oran Front

Cited by 282 publications

References 0 publications

Mesoscale subduction at the Almeria–Oran front

Mesoscale subduction at the Almeria–Oran front

Mesoscale subduction at the Almeria–Oran front

Genetic structure of the high dispersal Atlanto-Mediterreanean sea star Astropecten aranciacus revealed by mitochondrial DNA sequences and microsatellite loci

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