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21 results on '"Golfo de Cádiz (Espanha)"'

1. Assessment of sea surface temperature changes in the Gulf of Cadiz during the last 30 ka: implications for glacial changes in the regional hydrography

Author

Aurélie Penaud, Fabienne Marret, D. Blamart, Frédérique Eynaud, Linda Rossignol, Masa Kageyama, Thierry Mulder, Jean-Louis Turon, Antje H L Voelker, Environnements et Paléoenvironnements OCéaniques (EPOC), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Domaines Océaniques (LDO), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS), LNEG, Unidade de Geologia Marinha, Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Modélisation du climat (CLIM), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), School of Environmental Sciences, University of Liverpool, Paléocéanographie (PALEOCEAN), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), and Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)

Subjects
Planktonic foraminifera, Micropaleontology, 010506 paleontology, 010504 meteorology & atmospheric sciences, [SDE.MCG]Environmental Sciences/Global Changes, lcsh:Life, 01 natural sciences, Temperatura da água do mar, Dinocysts, Gulf of Cadiz, lcsh:QH540-549.5, Ekman transport, Mudanças climáticas, Dinocyst, 14. Life underwater, Younger Dryas, Glacial period, Stadial, Abrupt climate change, Ecology, Evolution, Behavior and Systematics, 0105 earth and related environmental sciences, Earth-Surface Processes, Last Glacial Maximum, lcsh:QE1-996.5, Hidrografia, lcsh:Geology, lcsh:QH501-531, Sea surface temperature, Golfo de Cádiz (Espanha), Oceanography, [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology, 13. Climate action, Upwelling, lcsh:Ecology, Paleotemperature, [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology, Geology
Abstract

New dinocyst analyses were conducted on core MD99-2339 retrieved from the central Gulf of Cadiz. Dinocyst and foraminiferal assemblages from this core are combined with existing data off SW Portugal and NW Morocco to investigate past hydrological and primary productivity regimes in the subtropical NE Atlantic Ocean over the last 30 ka. Our results have revealed highest upwelling intensity during Heinrich Stadial 1 (HS 1) and the Younger Dryas and weaker upwelling cells during the Last Glacial Maximum (LGM) and HS 2, off the SW Iberian and NW Moroccan margins. Similar assemblages between the Gulf of Cadiz and the NW Moroccan margin, and distinct species off Portugal, were observed during the cold climatic extremes that punctuated the last 30 ka. This pattern has been linked to the occurrence of a hydrological structure between SW Iberia and Cadiz during the last glacial period, perhaps similar to the modern Azores Front. This front was probably responsible locally for heterotrophic dinocysts found in the Gulf of Cadiz during the last glacial period, even if this sector is not conductive to upwelling phenomena by Ekman transport. Regional reconstructions of paleo-sea-surface temperatures (SSTs) using dinocyst and foraminiferal transfer functions, as well as alkenones, are also discussed and depict coherent scenarios over the last 30 ka. Seasonal reconstructions Correspondence to: A. Penaud (aurelie.penaud@univ-brest.fr.) of LGM SSTs obtained with this multi-proxy panel are discussed jointly with model outputs in order to contribute to ongoing efforts in model-data comparison C2007-FCT/319/2006 info:eu-repo/semantics/publishedVersion

Published
2018
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4. Onset, evolution and effects of the Mediterranean Outflow : an overview of IODP Expedition 339 in the Gulf of Cadiz

Author

Hernández-Molina, Francisco Javier, Stow, Dorrik A. V., Alvarez-Zarikian, Carlos, Lofi, Johanna, Ducassou, Emmanuelle, Sánchez Goñi, María Fernanda, Acton, Gary D., Bahr, André, Balestra, Barbara, Flood, Roger D., Flores, José-Abel, Furota, Satoshi, Grunert, Patrick, Hodell, David A., Jiménez Espejo, Francisco J., Kim, Jin Kyoung, Krissek, Lawrence A., Kuroda, Junichiro, Li, Baohua, LLave Barranco, Estefanía, Lourens, Lucas, Miller, Madeleine D., Nanayama, Futoshi, Nishida, Naohisa, Richter, Carl, Roque, Ana Cristina, Sierro, Francisco J., Singh, Arun D., Sloss, Craig R., Takashimizu, Yasuhiro, Tzanova, Alexandrina, Voelker, Antje H. L., Williams, Trevor, and Xuan, Chuang

Subjects
Sondagem oceânica, Golfo de Cádiz (Espanha), MOW, Oceanografia, Expedições
Published
2012

5. FMS resistivity layer characterization in a contourite depositional system : preliminary results from Sites U1389 and U1390, IODP Expedition 339 in the Gulf of Cadiz

Author

Lofi, Johanna, Galvani, Aurélie, Williams, Trevor, Hernández-Molina, Francisco Javier, Stow, Dorrik, Llave, Estefania, Miller, Madeleine D., Alvarez-Zarikian, Carlos, Roque, Ana Cristina, Voelker, Antje H. L., and Expedition IODP 339 Scientists

Subjects
Sondagem oceânica, Golfo de Cádiz (Espanha), Resistividade eléctrica
Published
2012

6. Preliminary results of IODP Expedition 339 Mediterranean Outflow

Author

Bahr, André, Hernández-Molina, Francisco Javier, Stow, Dorrik, Hodell, D. A., Alvarez-Zarikian, Carlos, Roque, Ana Cristina, Voelker, Antje H. L., and Expedition IODP 339 Scientists

Subjects
Sondagem oceânica, Paleoceanografia, Golfo de Cádiz (Espanha), MOW, Margem Ibérica Ocidental, Variações climáticas
Published
2012

7. Integrated Ocean Drilling Program Expedition 339 Preliminary Report : Mediterranean Outflow : Environmental significance of the Mediterranean Outflow water and its global implications : 16 November 2011-16 January 2012

Author

Hernández-Molina, Francisco Javier, Stow, Dorrik A. V., Alvarez-Zarikian, Carlos, Williams, Trevor, Lofi, Johanna, Acton, Gary D., Bahr, André, Balestra, Barbara, Ducassou, Emmanuelle, Flood, Roger D., Flores, José-Abel, Furota, Satoshi, Grunert, Patrick, Hodell, David A., Jimenez Espejo, Francisco J., Kim, Jin Kyoung, Krissek, Lawrence A., Kuroda, Junichiro, Li, Baohua, Lourens, Lucas, Miller, Madeleine D., Nanayama, Futoshi, Nishida, Naohisa, Richter, Carl, Sánchez Goñi, María Fernanda, Sierro Sánchez, Francisco J., Singh, Arun D., Sloss, Craig R., Takashimizu, Yasuhiro, Tzanova, Alexandrina, Voelker, Antje H. L., and Xuan, Chuang

Subjects
Sondagem oceânica, Golfo de Cádiz (Espanha), MOW, Oceanografia
Abstract

Submitted by Paula Serrano (paula.serrano@ineti.pt) on 2013-05-14T17:12:08Z No. of bitstreams: 1 35611.pdf: 4642239 bytes, checksum: 4321a8aea0910c342b8051bc8b38f416 (MD5) Approved for entry into archive by Paula Serrano (paula.serrano@ineti.pt) on 2013-05-14T17:12:18Z (GMT) No. of bitstreams: 1 35611.pdf: 4642239 bytes, checksum: 4321a8aea0910c342b8051bc8b38f416 (MD5) Made available in DSpace on 2013-05-14T17:12:18Z (GMT). No. of bitstreams: 1 35611.pdf: 4642239 bytes, checksum: 4321a8aea0910c342b8051bc8b38f416 (MD5) Previous issue date: 2012

Published
2012

9. Characterizing active faults and associated mass transport deposits in the South Iberian Margin (Alboran Sean and Gulf of Cadiz): on-fault and off-fault paleoseismic evidence

Author

Gràcia, Eulàlia, Bartolomé, Rafale, Lo Iacono, C., Moreno, X., Martínez-Loriente, S., Perea, Hector, Masana, E., Pallàs, R., Diez, S., Dañobeitia, Juanjo J., Terrinha, Pedro, and Zitellini, N.

Subjects
Golfo de Cádiz (Espanha), Margem Sul Ibérica, Tsunamis, Paleosismologia, Sismos, Falhas activas
Abstract

During the last years we have carried out successive high-resolution marine geological and geophysical surveys to investigate the seismic potential of the slow-moving seismogenic faults from the South Iberian Margin. Based on ,ultiscale acoustic mapping, sub-seafloor seismic imaging and dating methods we have characterized submarine fault systems with unprecedented resolution. We present primary paleoseismic evidence obtained by direct investigations of selected faults from theMediterranean Sea (i.e. Carboneras Fault, Bajo Segura Fault, Adra Fault) and the external part of the Gulf of Cadiz (i.e. Marques de Pombal Fault, Horseshoe Fault, Coral Patch Ridge Fault and SWIM lineaments). The obtained fault seismic parameters suggest that these faults are active and capable of generating large magnitude (Mw > 6) seismic events, representing an earthquake and tsunami hazard for the surrounding coastal areas. Secondary paleoseismic evidence in the SW Iberian Margin (based on landslides and turbidite deposits) yields a regional recurrence rate of large magnitude earthquake of 1800 - 2000 years.

Published
2010

11. Neotectónica e períodos de recorrência de grandes sismos e tsunamis na margem SW Ibérica e Golfo de Cádis

Author

Cunha, Tiago A., Matias, Luís M., Terrinha, Pedro, Negredo, A. M., Rosas, Filipe M., Fernandes, R. M. S., and Pinheiro, Luís M.

Subjects
Golfo de Cádiz (Espanha), Tsunamis, Neotectónica, Margem Continental Ibérica, Península Ibérica (Sudoeste), Sismos
Abstract

Neste trabalho usámos o método numérico das placas finas (Bird, 1999) para modelar a Neotectónica no Golfo de Cadiz e estimar os períodos de recorrência de grandes sismos e tsunamis. Foram testadas várias configurações de falhas e condições fronteira, e os resultados comparados com as observações de GPS, tensão e deformação sísmica. O melhor ajuste às observações é obtido com um modelo que apresenta uma taxa de movimentação de 1 mm/a nos cavalgamentos com orientação E-O e NE-SO, o que corresponde a períodos de recorrência de 1150, 3620 e 9900 anos para sismos de magnitude Mw de 7, 8 e 8.75.

Published
2010

17. Deep Submarine Giant Scours in northern Gulf of Cadiz (offshore SW Iberia): a singular case of sedimentary and tectonic coupling?

Author

Duarte, João C., Rosas, Filipe M., Terrinha, Pedro, Valadares, Vasco, Taborda, Rui, Matias, Luís, Roque, Ana Cristina, Magalhães, Vítor Hugo, Henriet, Jean-Pierre, and Pinheiro, Luís M.

Subjects
Golfo de Cádiz (Espanha), Sedimentação, Espanha, Tectónica, Batimetria
Abstract

Multi-beam swath bathymetry carried out in NW Gulf of Cadiz(offshore SW Iberia - MATESPRO campaign) revealed several intriguing morphologic features, lying at depths between -3900 and - 4700 m., in an area characterized by very shallow general slope gradients (dipping approximately 0.4 degrees). These three dimensional features are characterized by elliptical crescent shapes of kilometric length (major axis around 5 km), displaying internal escarpments up to 100 m high and slopes varying between 6 and 14 degrees.A single channel seismic profile acquired across two of these features shows that they have a sub-surface composite structure. The internal part of the crescent consists of a depression filled up with upslope prograding sedimentary units developing towards the scarp that sharply truncates the sedimentary horizons. The growth processes of these structures appears to be by retrogressive displacement of a morphological scarp and remobilization followed by deposition of the eroded material in front of the scarp, prograding towards it. This process is similar to the development of contourite bodies in which the current direction is parallel to the scarp, whilst in the present case the flow direction may be mainly perpendicular to the scarp.These units are overlain by a sub-horizontal turbidite-like sedimentary unit that partially infills the depression. A deep multi-channel seismic profile across the same structure revealed the existence of an underlying thrust, part of a major structure, the Gulf of Cadiz Accretionary Prism. These singular features are interpreted as the coupled of sedimentary and tectonic processes. It is proposed that the Deep Submarine Giant Scours formed when a local morphologic irregularity, corresponding to the bathymetric expression of movement on an underlying thrust, is enhanced by the erosional activity of turbidity and thermohaline bottom currents driven by the formation of local eddies in front of the scarp. The drift results from the re-deposition of the eroded material in the same location.

Published
2007

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