Deep-water formation variability in the north-western Mediterranean Sea during the last 2500yr: A proxy validation with present-day data

Here we investigate the sensitivity of deep-water formation in the north-western Mediterranean Sea to climate variability during the last 2500 yr. With this purpose, the grain-size parameter UP10 (fraction > 10 μm) is used as a proxy for intensity of deep-water circulation. Such a proxy is first...

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Autores: Cisneros Bermejo, Mercè, Cacho Lascorz, Isabel, Frigola Ferrer, Jaime I., Sanchez-Vidal, Anna, Calafat Frau, Antoni, Pedrosa Pàmies, Rut, Rumín Caparrós, Aitor, Canals Artigas, Miquel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2019
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:2445/147237
Acceso en línea:https://hdl.handle.net/2445/147237
Access Level:acceso abierto
Palabra clave:Geologia submarina
Fons marins
Mediterrània (Mar : nord-oest)
Submarine geology
Ocean bottom
Mediterranean Sea (northwest)
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spelling Deep-water formation variability in the north-western Mediterranean Sea during the last 2500yr: A proxy validation with present-day dataCisneros Bermejo, MercèCacho Lascorz, IsabelFrigola Ferrer, Jaime I.Sanchez-Vidal, AnnaCalafat Frau, AntoniPedrosa Pàmies, RutRumín Caparrós, AitorCanals Artigas, MiquelGeologia submarinaFons marinsMediterrània (Mar : nord-oest)Submarine geologyOcean bottomMediterranean Sea (northwest)Here we investigate the sensitivity of deep-water formation in the north-western Mediterranean Sea to climate variability during the last 2500 yr. With this purpose, the grain-size parameter UP10 (fraction > 10 μm) is used as a proxy for intensity of deep-water circulation. Such a proxy is first validated through the analysis of oceanographic data collected from October 2012 to October 2014 by means of two deep-water mooring lines equipped with sediment traps and currentmeters in the Gulf of Lion and north of Minorca Island. Enhancements of deep current speed resulted from dense shelf water cascading and open-sea deep convection in February 2013 leading to dense-water formation. The grain-size distribution of settling particles from sediment traps collected during 2012-2013 shows a distinctive particle mode and high UP10 values correlated to deep-water formation. These data are consistent with grain-size values in sediment cores from the north of Minorca, thus supporting the validity of the UP10 parameter to reconstruct changes of intensity in deep-water formation and associated near-bottom currents. The deep-water sediment record of the north of Minorca for the last 2.5 kyr shows that the strongest deep-water formation events occurred during relatively warm intervals, such as the Roman Period (123 BCE-470 CE2), the end of the Medieval Climate Anomaly (900-1275 CE) and the first part of the Little Ice Age (1275-1850 CE). By contrast, our data indicate a progressive reduction in the overturning conditions during the Early Middle Ages (470-900 CE) resulting in weaker deep-water formation events during most of the Medieval Climate Anomaly. Intense deep-water formation events appear to be mostly associated with periods of enhanced Evaporation-Precipitation balance rather than to buoyancy loss due to winter cooling only. Our results suggest that warm sea surface temperature during spring months could have played an important role by increasing the Evaporation-Precipitation balance and favouring buoyany loss by increased of salinity. The comparison our data with other oceanographic and climatic records indicates a change in the proxy relation before and after the Early Middle Ages. Western Mediterranean Deep Water and Levantine Intermediate Water behave in opposite way after the Early Middle Ages, thus indicating that the previously proposed Mediterranean see-saw pattern in the Evaporation-Precipitation balance also influenced convection patterns in the basins during the last 1500 yr. These changes are discussed in the frame of different configurations of the North Atlantic Oscillation and East Atlantic/ West Russian modes of atmospheric variation.Elsevier B.V.2020202020192020info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion13 p.application/pdfhttps://hdl.handle.net/2445/147237Articles 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: https://doi.org/10.1016/j.gloplacha.2019.03.012Global and Planetary Change, 2019, vol. 177, p. 56-68https://doi.org/10.1016/j.gloplacha.2019.03.012info:eu-repo/grantAgreement/EC/H2020/683237cc-by-nc-nd (c) Cisneros et al., 2019http://creativecommons.org/licenses/by-nc-nd/3.0/esinfo:eu-repo/semantics/openAccessoai:recercat.cat:2445/1472372026-05-29T05:05:01Z
dc.title.none.fl_str_mv Deep-water formation variability in the north-western Mediterranean Sea during the last 2500yr: A proxy validation with present-day data
title Deep-water formation variability in the north-western Mediterranean Sea during the last 2500yr: A proxy validation with present-day data
spellingShingle Deep-water formation variability in the north-western Mediterranean Sea during the last 2500yr: A proxy validation with present-day data
Cisneros Bermejo, Mercè
Geologia submarina
Fons marins
Mediterrània (Mar : nord-oest)
Submarine geology
Ocean bottom
Mediterranean Sea (northwest)
title_short Deep-water formation variability in the north-western Mediterranean Sea during the last 2500yr: A proxy validation with present-day data
title_full Deep-water formation variability in the north-western Mediterranean Sea during the last 2500yr: A proxy validation with present-day data
title_fullStr Deep-water formation variability in the north-western Mediterranean Sea during the last 2500yr: A proxy validation with present-day data
title_full_unstemmed Deep-water formation variability in the north-western Mediterranean Sea during the last 2500yr: A proxy validation with present-day data
title_sort Deep-water formation variability in the north-western Mediterranean Sea during the last 2500yr: A proxy validation with present-day data
dc.creator.none.fl_str_mv Cisneros Bermejo, Mercè
Cacho Lascorz, Isabel
Frigola Ferrer, Jaime I.
Sanchez-Vidal, Anna
Calafat Frau, Antoni
Pedrosa Pàmies, Rut
Rumín Caparrós, Aitor
Canals Artigas, Miquel
author Cisneros Bermejo, Mercè
author_facet Cisneros Bermejo, Mercè
Cacho Lascorz, Isabel
Frigola Ferrer, Jaime I.
Sanchez-Vidal, Anna
Calafat Frau, Antoni
Pedrosa Pàmies, Rut
Rumín Caparrós, Aitor
Canals Artigas, Miquel
author_role author
author2 Cacho Lascorz, Isabel
Frigola Ferrer, Jaime I.
Sanchez-Vidal, Anna
Calafat Frau, Antoni
Pedrosa Pàmies, Rut
Rumín Caparrós, Aitor
Canals Artigas, Miquel
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Geologia submarina
Fons marins
Mediterrània (Mar : nord-oest)
Submarine geology
Ocean bottom
Mediterranean Sea (northwest)
topic Geologia submarina
Fons marins
Mediterrània (Mar : nord-oest)
Submarine geology
Ocean bottom
Mediterranean Sea (northwest)
description Here we investigate the sensitivity of deep-water formation in the north-western Mediterranean Sea to climate variability during the last 2500 yr. With this purpose, the grain-size parameter UP10 (fraction > 10 μm) is used as a proxy for intensity of deep-water circulation. Such a proxy is first validated through the analysis of oceanographic data collected from October 2012 to October 2014 by means of two deep-water mooring lines equipped with sediment traps and currentmeters in the Gulf of Lion and north of Minorca Island. Enhancements of deep current speed resulted from dense shelf water cascading and open-sea deep convection in February 2013 leading to dense-water formation. The grain-size distribution of settling particles from sediment traps collected during 2012-2013 shows a distinctive particle mode and high UP10 values correlated to deep-water formation. These data are consistent with grain-size values in sediment cores from the north of Minorca, thus supporting the validity of the UP10 parameter to reconstruct changes of intensity in deep-water formation and associated near-bottom currents. The deep-water sediment record of the north of Minorca for the last 2.5 kyr shows that the strongest deep-water formation events occurred during relatively warm intervals, such as the Roman Period (123 BCE-470 CE2), the end of the Medieval Climate Anomaly (900-1275 CE) and the first part of the Little Ice Age (1275-1850 CE). By contrast, our data indicate a progressive reduction in the overturning conditions during the Early Middle Ages (470-900 CE) resulting in weaker deep-water formation events during most of the Medieval Climate Anomaly. Intense deep-water formation events appear to be mostly associated with periods of enhanced Evaporation-Precipitation balance rather than to buoyancy loss due to winter cooling only. Our results suggest that warm sea surface temperature during spring months could have played an important role by increasing the Evaporation-Precipitation balance and favouring buoyany loss by increased of salinity. The comparison our data with other oceanographic and climatic records indicates a change in the proxy relation before and after the Early Middle Ages. Western Mediterranean Deep Water and Levantine Intermediate Water behave in opposite way after the Early Middle Ages, thus indicating that the previously proposed Mediterranean see-saw pattern in the Evaporation-Precipitation balance also influenced convection patterns in the basins during the last 1500 yr. These changes are discussed in the frame of different configurations of the North Atlantic Oscillation and East Atlantic/ West Russian modes of atmospheric variation.
publishDate 2019
dc.date.none.fl_str_mv 2019
2020
2020
2020
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/2445/147237
url https://hdl.handle.net/2445/147237
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1016/j.gloplacha.2019.03.012
Global and Planetary Change, 2019, vol. 177, p. 56-68
https://doi.org/10.1016/j.gloplacha.2019.03.012
info:eu-repo/grantAgreement/EC/H2020/683237
dc.rights.none.fl_str_mv cc-by-nc-nd (c) Cisneros et al., 2019
http://creativecommons.org/licenses/by-nc-nd/3.0/es
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-nc-nd (c) Cisneros et al., 2019
http://creativecommons.org/licenses/by-nc-nd/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 13 p.
application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
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
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score 15,81155

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