Near-bottom particulate matter dynamics in the Nazaré submarine canyon under calm and stormy conditions

14 pages, 9 figures, 1 table

Detalles Bibliográficos
Autores: Martín, Jacobo, Palanques, Albert, Vitorino, João, Oliveira, Anabela, De Stigter, Henko C.
Tipo de recurso: artículo
Fecha de publicación:2011
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/46041
Acceso en línea:http://hdl.handle.net/10261/46041
Access Level:acceso abierto
Palabra clave:Particulate flux
Continental margins
Submarine canyon
Northeast Atlantic
Iberian margin
Nazaré Canyon
Northeastern Atlantic
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spelling Near-bottom particulate matter dynamics in the Nazaré submarine canyon under calm and stormy conditionsMartín, JacoboPalanques, AlbertVitorino, JoãoOliveira, AnabelaDe Stigter, Henko C.Particulate fluxContinental marginsSubmarine canyonNortheast AtlanticIberian marginNazaré CanyonNortheastern Atlantic14 pages, 9 figures, 1 tableTwo mooring lines equipped with near-bottom sediment traps were deployed in the axis of the Nazaré submarine canyon at ∼1600 and ∼3300 m depth, respectively. We studied time-series of particle flux, composition (biogenic silica, carbonates, organic matter and lithogenic fractions), granulometry, mineralogy and 210Pb concentration of particulate matter over five sediment trap deployments between October 2002 and December 2004. Current meters equipped with turbidimeters were also deployed at trap depths to monitor the water flow, temperature, salinity and suspended particle concentration. The composition of the collected particles was fairly constant year-round, dominated by the lithogenic fraction and with OC/N ratios in the range 11–21, suggesting an important terrigenous influence inside the canyon. The results show contrasting dynamic environments in the upper (1600 m depth) and middle (3300 m depth) canyon. High current speeds (spring tides up to 80 cm s−1) and high apparent mass fluxes of particulate matter (mean 65 g m−2 d−1; maximum 265 g m−2 d−1) are permanent at the shallowest station. At the deepest site, fluxes were below 10 g m−2 d−1 most of the time and the annual flux was governed by events of sharp flux increase. Storms affecting the continental shelf during autumn and winter are a major driver of down-canyon dispersal of sediments to the middle canyon and beyond. Important nepheloid activity developed inside the canyon in response to storms with significant wave heights between 4 and 6 m, as testified by turbidimeters deployed in midwater and near the seabed at 1600 m water depth. On three occasions during the study period, significant wave heights of incident storms surpassed 7 m, leading to notable episodes of down-canyon transport that were clearly observed in the middle canyon. During one of these stormy periods (January 2003) a sediment gravity flow transporting unusual quantities of sand and coastal plant debris was observed at 3200 m. However, a storm with significant wave heights as low as 5 m was apparently able to trigger a sediment gravity flow reaching beyond the middle canyon. The role of storms in the offshore dispersal of sediments is clearly relevant but seems to be modulated by synergic factors such as river floodingJ. Martín was funded during this study through an FPI scholarship granted by Ministerio de Ciencia y Tecnología (Spanish Ministry of Science and Technology), and by the EUROSTRATAFORM project (EKV3-CT-2002-00079)Peer reviewedElsevier201220122011info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/46041reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/j.dsr2.2011.04.004info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/460412026-05-22T06:33:51Z
dc.title.none.fl_str_mv Near-bottom particulate matter dynamics in the Nazaré submarine canyon under calm and stormy conditions
title Near-bottom particulate matter dynamics in the Nazaré submarine canyon under calm and stormy conditions
spellingShingle Near-bottom particulate matter dynamics in the Nazaré submarine canyon under calm and stormy conditions
Martín, Jacobo
Particulate flux
Continental margins
Submarine canyon
Northeast Atlantic
Iberian margin
Nazaré Canyon
Northeastern Atlantic
title_short Near-bottom particulate matter dynamics in the Nazaré submarine canyon under calm and stormy conditions
title_full Near-bottom particulate matter dynamics in the Nazaré submarine canyon under calm and stormy conditions
title_fullStr Near-bottom particulate matter dynamics in the Nazaré submarine canyon under calm and stormy conditions
title_full_unstemmed Near-bottom particulate matter dynamics in the Nazaré submarine canyon under calm and stormy conditions
title_sort Near-bottom particulate matter dynamics in the Nazaré submarine canyon under calm and stormy conditions
dc.creator.none.fl_str_mv Martín, Jacobo
Palanques, Albert
Vitorino, João
Oliveira, Anabela
De Stigter, Henko C.
author Martín, Jacobo
author_facet Martín, Jacobo
Palanques, Albert
Vitorino, João
Oliveira, Anabela
De Stigter, Henko C.
author_role author
author2 Palanques, Albert
Vitorino, João
Oliveira, Anabela
De Stigter, Henko C.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Particulate flux
Continental margins
Submarine canyon
Northeast Atlantic
Iberian margin
Nazaré Canyon
Northeastern Atlantic
topic Particulate flux
Continental margins
Submarine canyon
Northeast Atlantic
Iberian margin
Nazaré Canyon
Northeastern Atlantic
description 14 pages, 9 figures, 1 table
publishDate 2011
dc.date.none.fl_str_mv 2011
2012
2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/46041
url http://hdl.handle.net/10261/46041
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.dsr2.2011.04.004
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869410039149625344
score 15,811543

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