Seasonal and wind-induced variability of Sea Surface Temperature patterns in the Gulf of Cádiz

Vargas, J. Mario; García‐Lafuente, Jesús; Delgado, Javier; Criado, Francisco

doi:10.1016/s0924-7963(02)00240-3

Cited by 99 publications

(54 citation statements)

References 23 publications

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“…Another consequence of this seasonality is the weakening of the horizontal pressure gradient in winter that facilitates the reversal of the circulation during this season under intense external forcing (see examples in Fig. 6), a situation that agrees with results obtained in previous studies (Vargas et al 2003, García Lafuente andRuiz 2007). Although this study does not deal with external forcing explicitly, these drastic changes are surely driven by seasonal changes in the wind regime off the Iberian Peninsula, which veers from northerly in summer (the upwelling season) to westerly or southwesterly in winter (Fiúza et al 1982, Fiúza 1983, following the seasonal displacement of the Azores high.…”

Section: Discussionsupporting

confidence: 91%

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Two decades of mesoscale phenomena on either side of the Strait of Gibraltar

Delgado¹,

García‐Lafuente²,

Naranjo³

2012

Sci. Mar.

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Section: Discussionsupporting

confidence: 91%

“…For instance, Vargas et al (2003) use sea surface temperature (SST) images to characterize the principal modes of surface circulation in the GoC. Stanichny et al (2005) exploit high resolution SST images to address local wind-driven upwelling along the African coast in the area of the SG.…”

Section: Introductionmentioning

confidence: 99%

Two decades of mesoscale phenomena on either side of the Strait of Gibraltar

Delgado¹,

García‐Lafuente²,

Naranjo³

2012

Sci. Mar.

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“…Vicent (S Portugal), and during westerly conditions, upwelled waters extend eastwards along the shelf margin reaching our study area (Vargas et al, 2003;Criado-Aldeanueva et al, 2006).…”

Section: Accepted M Manuscriptmentioning

confidence: 86%

Messinian paleoenvironmental evolution in the lower Guadalquivir Basin (SW Spain) based on benthic foraminifera

Pérez-Asensio

Aguirre

Schmiedl

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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Benthic foraminiferal assemblages of a drill core from the lower Guadalquivir Basin (northern Gulf of Cádiz, SW Spain) have been analysed in order to reconstruct the paleoenvironmental evolution in the vicinity of the Betic seaways during the Messinian. The core consists of marine sediments ranging from the latest Tortonian to the early Pliocene. Changes in the abundance of certain marker species, planktonic/benthic ratio (P/B ratio), paleodepth estimated with a transfer function, content of sand grains and presence of glauconitic layers indicate a complete transgressive-regressive sea-level cycle from the bottom to the top of the section. An abrupt sea-level rise, from inner-middle shelf to middle slope, is recorded at the lowermost part of the core (latest Tortonian-earliest Messinian), followed by a relatively rapid shallowing from middle slope to outer shelf. Magnetobiostratigraphic data show These assemblages are dominated by Nonion fabum and Bulimina elongata, two taxa that are able to feed from continental low-quality organic matter, most likely derived from river run-off. The paleoenviromental evolution on the Atlantic side of Betic and Rifian seaways is similar during the Messinian, with a Messinian continuous sea-level lowering driven by regional tectonic uplift and upwelling-related waters reaching the upper slope. This study will further contribute to understand the role of tectonics on the sea-level changes as well as on the closure of the Atlantic-Mediterranean gateways that led to the MSC, and on the paleoceanography on the Atlantic sides of these corridors.

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“…The surface circulation of the GoC is linked to the North Atlantic subtropical gyre formed by the Azores current, and, therefore, Olaguer-Feliú et al: Transport mechanisms affecting crab megalopae subjected to its seasonal fluctuations caused by the displacement of the Azores atmospheric high. However, an anticyclonic circulation within the Gulf occurs almost throughout the year (Vargas et al 2003), but more markedly during spring and summer (García-Lafuente & Ruiz 2007). Such large-scale circulation results in a SE longshore current following the coastline, from the northeastern shelf of the GoC to the Alborán Basin in the Mediterranean Sea .…”

mentioning

confidence: 99%

Shelf and estuarine transport mechanisms affecting the supply of competent larvae in a suite of brachyuran crabs with different life histories

Olaguer-Feliú

Flores²,

Queiroga³

et al. 2010

Mar. Ecol. Prog. Ser.

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Supply of competent larvae to the benthic habitat is a major determinant of population dynamics in coastal and estuarine invertebrates with an indirect life cycle. Larval delivery may depend not only on physical transport mechanisms, but also on larval behavior and physiological progress to the competent stage. Yet, the combined analysis of such factors has seldom been attempted. We used time-series analyses to examine tide-and wind-driven mechanisms responsible for the supply of crab megalopae to an estuarine river under a major marine influence in SW Spain, and monitored the vertical distribution of upstream moving megalopae, their net flux and competent state. The species Panopeus africanus (estuarine), Brachynotus sexdentatus (euryhaline) and Nepinnotheres pinnotheres (coastal) comprised 80% of the whole sample, and responded in a similar way to tide and wind forcing. Tidal range was positively correlated to supply, with maxima 0 to 1 d after spring tides, suggesting selective tidal stream transport. Despite being extensively subjected to upwelling, downwind drift under the effect of westerlies, not Ekman transport, explained residual supply variation at our sampling area. Once in the estuary, net flux and competence state matched the expected trends. Net upstream flux increased from B. sexdentatus to P. africanus, favoring transport to a sheltered coastal habitat (N. pinnotheres), or to the upper estuary (P. africanus). Competence state was highest in N. pinnotheres, intermediate in B. sexdentatus and lowest in P. africanus, as expected if larvae respond to cues from adequate benthic habitat. P. africanus megalopae were found close to the bottom, not above, rendering slower upstream transport than anticipated. KEY WORDS: Upwelling · Ekman transport · Downwind drift · Selective tidal stream transport · Larval net flux · Bay of Cádiz Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 410: [125][126][127][128][129][130][131][132][133][134][135][136][137][138][139][140][141] 2010 1988, Palmer et al. 1996) makes dispersal neutral or even disadvantageous (Strathmann et al. 2002). An ontogenetic migration function has been hypothesized to better explain larval offshore exportation (Strathmann et al. 2002). Offshore migration of early life-cycle stages would reduce predation, expose larvae to a more tolerable environmental variability and, occasionally, diminish food competition with benthic suspension feeders in coastal or estuarine areas. Still, the migration back to adult habitats depends on how far the larvae migrate from the parental area, their behavioral capabilities and the water current patterns they are exposed to (Sponaugle et al. 2002).As coastal (Caley et al. 1996, Armsworth 2002) and estuarine (Bilton et al. 2002) benthic populations may often be recruitment-limited, larval supply and settlement success are critical processes for their maintenance (Gaines & Roughgarden 1985, Roughgarden et al. 1988. Understanding the mechanisms responsible for...

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Seasonal and wind-induced variability of Sea Surface Temperature patterns in the Gulf of Cádiz

Cited by 99 publications

References 23 publications

Two decades of mesoscale phenomena on either side of the Strait of Gibraltar

Two decades of mesoscale phenomena on either side of the Strait of Gibraltar

Messinian paleoenvironmental evolution in the lower Guadalquivir Basin (SW Spain) based on benthic foraminifera

Shelf and estuarine transport mechanisms affecting the supply of competent larvae in a suite of brachyuran crabs with different life histories

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