Impact of open-ocean convection on particle fluxes and sediment dynamics in the deep margin of the Gulf of Lions.

Abstract. The deep outer margin of the Gulf of Lions and the adjacent basin, in the western Mediterranean Sea, are regularly impacted by open-ocean convection, a major hydrodynamic event responsible for the ventilation of the deep water in the western Mediterranean Basin. However, the impact of open...

Descripción completa

Detalles Bibliográficos
Autores: Stabholz, M., Durrieu de Madron, Xavier, Canals Artigas, Miquel, Khripounoff, A., Taupier-Letage, I., Testor, Pierre, Heussner, Serge, Kerhervé, P., Delsaut, N., Houpert, Loic, Lastras Membrive, Galderic, Dennielou, B.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2013
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/44752
Acceso en línea:https://hdl.handle.net/2445/44752
Access Level:acceso abierto
Palabra clave:Lleó, Golf del (França)
Sediments marins
Lions, Gulf of (France)
Marine sediments
id ES_8dccefe1e4c4724b271a9bbfc200d84f
oai_identifier_str oai:recercat.cat:2445/44752
network_acronym_str ES
network_name_str España
repository_id_str
spelling Impact of open-ocean convection on particle fluxes and sediment dynamics in the deep margin of the Gulf of Lions.Stabholz, M.Durrieu de Madron, XavierCanals Artigas, MiquelKhripounoff, A.Taupier-Letage, I.Testor, PierreHeussner, SergeKerhervé, P.Delsaut, N.Houpert, LoicLastras Membrive, GaldericDennielou, B.Lleó, Golf del (França)Sediments marinsLions, Gulf of (France)Marine sedimentsAbstract. The deep outer margin of the Gulf of Lions and the adjacent basin, in the western Mediterranean Sea, are regularly impacted by open-ocean convection, a major hydrodynamic event responsible for the ventilation of the deep water in the western Mediterranean Basin. However, the impact of open-ocean convection on the flux and transport of particulate matter remains poorly understood. The variability of water mass properties (i.e., temperature and salinity), currents, and particle fluxes were monitored between September 2007 and April 2009 at five instrumented mooring lines deployed between 2050 and 2350-m depth in the deepest continental margin and adjacent basin. Four of the lines followed a NW-SE transect, while the fifth one was located on a sediment wave field to the west. The results of the main, central line SC2350 ("LION") located at 42 02.50 N, 4 410 E, at 2350-m depth, show that open-ocean convection reached midwater depth ( 1000-m depth) during winter 2007-2008, and reached the seabed ( 2350-m depth) during winter 2008-2009. Horizontal currents were unusually strong with speeds up to 39 cm s−1 during winter 2008-2009. The measurements at all 5 different locations indicate that mid-depth and near-bottom currents and particle fluxes gave relatively consistent values of similar magnitude across the study area except during winter 2008-2009, when near-bottom fluxes abruptly increased by one to two orders of magnitude. Particulate organic carbon contents, which generally vary between 3 and 5 %, were abnormally low ( 1 %) during winter 2008-2009 and approached those observed in surface sediments (0.6 %). Turbidity profiles made in the region demonstrated the existence of a bottom nepheloid layer, several hundred meters thick, and related to the resuspension of bottom sediments. These observations support the view that open-ocean deep convection events in the Gulf of Lions can cause significant remobilization of sediments in the deep outer margin and the basin, with a subsequent alteration of the seabed likely impacting the functioning of the deep-sea ecosystem.European Geosciences Union2013201320132013info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion20 p.application/pdfhttps://hdl.handle.net/2445/44752Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: 10.5194/bgd-10-1097-2013Biogeosciences, 2013, vol. 10, p. 1097-1116http://dx.doi.org/10.5194/bgd-10-1097-2013info:eu-repo/grantAgreement/EC/FP7/226354cc-by (c) Stabholz, M. et al., 2013http://creativecommons.org/licenses/by/3.0/esinfo:eu-repo/semantics/openAccessoai:recercat.cat:2445/447522026-05-29T05:05:01Z
dc.title.none.fl_str_mv Impact of open-ocean convection on particle fluxes and sediment dynamics in the deep margin of the Gulf of Lions.
title Impact of open-ocean convection on particle fluxes and sediment dynamics in the deep margin of the Gulf of Lions.
spellingShingle Impact of open-ocean convection on particle fluxes and sediment dynamics in the deep margin of the Gulf of Lions.
Stabholz, M.
Lleó, Golf del (França)
Sediments marins
Lions, Gulf of (France)
Marine sediments
title_short Impact of open-ocean convection on particle fluxes and sediment dynamics in the deep margin of the Gulf of Lions.
title_full Impact of open-ocean convection on particle fluxes and sediment dynamics in the deep margin of the Gulf of Lions.
title_fullStr Impact of open-ocean convection on particle fluxes and sediment dynamics in the deep margin of the Gulf of Lions.
title_full_unstemmed Impact of open-ocean convection on particle fluxes and sediment dynamics in the deep margin of the Gulf of Lions.
title_sort Impact of open-ocean convection on particle fluxes and sediment dynamics in the deep margin of the Gulf of Lions.
dc.creator.none.fl_str_mv Stabholz, M.
Durrieu de Madron, Xavier
Canals Artigas, Miquel
Khripounoff, A.
Taupier-Letage, I.
Testor, Pierre
Heussner, Serge
Kerhervé, P.
Delsaut, N.
Houpert, Loic
Lastras Membrive, Galderic
Dennielou, B.
author Stabholz, M.
author_facet Stabholz, M.
Durrieu de Madron, Xavier
Canals Artigas, Miquel
Khripounoff, A.
Taupier-Letage, I.
Testor, Pierre
Heussner, Serge
Kerhervé, P.
Delsaut, N.
Houpert, Loic
Lastras Membrive, Galderic
Dennielou, B.
author_role author
author2 Durrieu de Madron, Xavier
Canals Artigas, Miquel
Khripounoff, A.
Taupier-Letage, I.
Testor, Pierre
Heussner, Serge
Kerhervé, P.
Delsaut, N.
Houpert, Loic
Lastras Membrive, Galderic
Dennielou, B.
author2_role author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Lleó, Golf del (França)
Sediments marins
Lions, Gulf of (France)
Marine sediments
topic Lleó, Golf del (França)
Sediments marins
Lions, Gulf of (France)
Marine sediments
description Abstract. The deep outer margin of the Gulf of Lions and the adjacent basin, in the western Mediterranean Sea, are regularly impacted by open-ocean convection, a major hydrodynamic event responsible for the ventilation of the deep water in the western Mediterranean Basin. However, the impact of open-ocean convection on the flux and transport of particulate matter remains poorly understood. The variability of water mass properties (i.e., temperature and salinity), currents, and particle fluxes were monitored between September 2007 and April 2009 at five instrumented mooring lines deployed between 2050 and 2350-m depth in the deepest continental margin and adjacent basin. Four of the lines followed a NW-SE transect, while the fifth one was located on a sediment wave field to the west. The results of the main, central line SC2350 ("LION") located at 42 02.50 N, 4 410 E, at 2350-m depth, show that open-ocean convection reached midwater depth ( 1000-m depth) during winter 2007-2008, and reached the seabed ( 2350-m depth) during winter 2008-2009. Horizontal currents were unusually strong with speeds up to 39 cm s−1 during winter 2008-2009. The measurements at all 5 different locations indicate that mid-depth and near-bottom currents and particle fluxes gave relatively consistent values of similar magnitude across the study area except during winter 2008-2009, when near-bottom fluxes abruptly increased by one to two orders of magnitude. Particulate organic carbon contents, which generally vary between 3 and 5 %, were abnormally low ( 1 %) during winter 2008-2009 and approached those observed in surface sediments (0.6 %). Turbidity profiles made in the region demonstrated the existence of a bottom nepheloid layer, several hundred meters thick, and related to the resuspension of bottom sediments. These observations support the view that open-ocean deep convection events in the Gulf of Lions can cause significant remobilization of sediments in the deep outer margin and the basin, with a subsequent alteration of the seabed likely impacting the functioning of the deep-sea ecosystem.
publishDate 2013
dc.date.none.fl_str_mv 2013
2013
2013
2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/44752
url https://hdl.handle.net/2445/44752
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: 10.5194/bgd-10-1097-2013
Biogeosciences, 2013, vol. 10, p. 1097-1116
http://dx.doi.org/10.5194/bgd-10-1097-2013
info:eu-repo/grantAgreement/EC/FP7/226354
dc.rights.none.fl_str_mv cc-by (c) Stabholz, M. et al., 2013
http://creativecommons.org/licenses/by/3.0/es
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by (c) Stabholz, M. et al., 2013
http://creativecommons.org/licenses/by/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 20 p.
application/pdf
dc.publisher.none.fl_str_mv European Geosciences Union
publisher.none.fl_str_mv European Geosciences Union
dc.source.none.fl_str_mv Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869413076030193664
score 15.811543

Similares en LA Referencia