Tracing the late Holocene evolution of the NW Iberian upwelling system

Martins, V.; Jouanneau, Jean-Marie; Weber, O.; Rocha, Fernando

doi:10.1016/j.marmicro.2005.12.002

Cited by 69 publications

(76 citation statements)

References 89 publications

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“…and benthic δ 18 O values (Table 1). This is also supported by observations from analogous modern environments Mendes et al 2004;Martins et al 2006;Mojtahid et al 2006). The glacial enhancement of upwelling in the lower Guadalquivir Basin was probably caused by stronger winds promoting Ekman pumping similar to glacial intervals of the Quaternary (Lebreiro et al 1997;Poli et al 2010;Salgueiro et al 2010).…”

Section: Upper-slope Fresh and Degraded Organic Matter Linked To Upwesupporting

confidence: 73%

Messinian productivity changes in the northeastern Atlantic and their relationship to the closure of the Atlantic–Mediterranean gateway: implications for Neogene palaeoclimate and palaeoceanography

Pérez-Asensio

Aguirre

Schmiedl

et al. 2014

JGS

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Abstract:The stable isotope composition of planktic and benthic foraminifera and the distribution of selected benthic foraminiferal species from a Messinian record of the lower Guadalquivir Basin, northeastern Atlantic Ocean, show that regional productivity changes were linked to glacioeustatic fluctuations. Glacial periods were characterized by poorly ventilated bottom waters as a result of weak Atlantic Meridional Overturning Circulation (AMOC), and by phases of high productivity related to intensified upwelling. In contrast, wellventilated bottom waters owing to strong AMOC, the presence of degraded organic matter in the upper slope, and high input of degraded terrestrial organic matter derived from fluvial discharge to the outer shelf were recorded during interglacial periods. Before closure of the adjacent Guadalhorce Corridor at 6.18 Ma, which was the final active Betic Atlantic-Mediterranean gateway, the study area was alternately influenced by wellventilated Mediterranean Outflow Water (MOW) and poorly ventilated Atlantic Upwelled Water (AUW). Following closure of the corridor, cessation of the MOW reduced the AMOC and promoted glacial conditions in the northern hemisphere, resulting in the establishment of local upwelling cells.

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Section: Upper-slope Fresh and Degraded Organic Matter Linked To Upwesupporting

confidence: 73%

Messinian productivity changes in the northeastern Atlantic and their relationship to the closure of the Atlantic–Mediterranean gateway: implications for Neogene palaeoclimate and palaeoceanography

Pérez-Asensio

Aguirre

Schmiedl

et al. 2014

JGS

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“…The direct comparison of our specimens with the specimens of Mendes (2010) led us to conclude that both belong to the same species and thus Mendes' (2010) identification criteria were adopted. Bolivina ordinaria distribution within the Guadiana Estuary was surprising, as it is primarily described as an abundant species at great depths on the Portuguese continental shelf (Mendes et al, 2004;Martins et al, 2006Martins et al, , 2007Mendes, 2010). Mendes (2010) considered B. ordinaria as a ubiquitous, very abundant species, highly adaptable and tolerant to a wide range of different factors or combination of factors, living at two different continental-shelf depth ranges (25-100 m in the southeast and 20-60 m in the northwest Gulf of Cadiz), and strongly associated with the direct influence of river discharges.…”

Section: Middle Estuarymentioning

confidence: 99%

Taxonomy, ecology and biogeographical trends of dominant benthic foraminifera species from an Atlantic-Mediterranean estuary (the Guadiana, southeast Portugal)

Camacho

Moura

Connor

et al. 2015

Palaeontologia Electronica

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“…indicates a productivity between 4.0 to 17.0 g C m -2 yr -1 in NW-Africa and Gulf of Guinea and from 4.0 to 5.1 g C m -2 yr -1 in the northeastern Atlantic (Schönfeld and Altenbach, 2005). Furthermore, this species is common in upper slope and outer shelf environments under the influence of seasonal upwelling events, for example off Southwest Africa (Schmiedl et al, 1997), off the Ría de Vigo, NW Spain (Martins et al, 2006), off Congo (Mojtahid et al, 2006), and off the Guadiana platform, SW Spain , close to the study area.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

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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Tracing the late Holocene evolution of the NW Iberian upwelling system

Cited by 69 publications

References 89 publications

Messinian productivity changes in the northeastern Atlantic and their relationship to the closure of the Atlantic–Mediterranean gateway: implications for Neogene palaeoclimate and palaeoceanography

Messinian productivity changes in the northeastern Atlantic and their relationship to the closure of the Atlantic–Mediterranean gateway: implications for Neogene palaeoclimate and palaeoceanography

Taxonomy, ecology and biogeographical trends of dominant benthic foraminifera species from an Atlantic-Mediterranean estuary (the Guadiana, southeast Portugal)

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

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