Meltwater flux from northern ice-sheets to the mediterranean during MIS 12

[EN] Planktonic foraminifer oxygen isotopes through MIS 12 were analysed from Ocean Drilling Program Site 977 in the Alboran Sea. After the correction of the sea surface temperature (SST) effect on the d18O composition of foraminiferal calcite, the resulting seawater d18O (d18Ow) was used to reconst...

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Detalles Bibliográficos
Autores: Alonso Azibeiro, Lucía, Sierro Sánchez, Francisco Javier, Capotondi, Lucilla, Lirer, Fabrizio, Andersen, Nils, González Lanchas, Alba, Alonso García, Montserrat, Flores Villarejo, José Abel, Cortina, Aleix, Grimalt, Joan O., Martrat, Belen, Cacho, Isabel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Institución:Universidad de Salamanca (USAL)
Repositorio:GREDOS. Repositorio Institucional de la Universidad de Salamanca
OAI Identifier:oai:gredos.usal.es:10366/159449
Acceso en línea:http://hdl.handle.net/10366/159449
Access Level:acceso abierto
Palabra clave:Mediterranean
Millennial climate variability
Freshwater
Meltwater
Palaeoceanography
Marine isotope stage 12
Foraminifera
Glacial
2506 Geología
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repository_id_str
spelling Meltwater flux from northern ice-sheets to the mediterranean during MIS 12Alonso Azibeiro, LucíaSierro Sánchez, Francisco JavierCapotondi, LucillaLirer, FabrizioAndersen, NilsGonzález Lanchas, AlbaAlonso García, MontserratFlores Villarejo, José AbelCortina, AleixGrimalt, Joan O.Martrat, BelenCacho, IsabelMediterraneanMillennial climate variabilityFreshwaterMeltwaterPalaeoceanographyMarine isotope stage 12ForaminiferaGlacial2506 Geología[EN] Planktonic foraminifer oxygen isotopes through MIS 12 were analysed from Ocean Drilling Program Site 977 in the Alboran Sea. After the correction of the sea surface temperature (SST) effect on the d18O composition of foraminiferal calcite, the resulting seawater d18O (d18Ow) was used to reconstruct variations in the d18Ow of the Atlantic inflow into the Mediterranean. A synchronous record from the KC01B core, in the Ionian Sea, was used to evaluate changes in the oxygen isotope gradient within the Mediterranean due to hydrological variations during MIS 12. Instead of the glacial d18Ow enrichment expected for the Mediterranean, lower values than today have been observed both in the Alboran and the Ionian seas, especially between 455 ka and the end of MIS 12 (424 ka). These negative oxygen isotope anomalies must have been caused by a flux of freshwater to the Mediterranean during MIS 12. Although the largest fraction of the freshwater anomalies entered the Mediterranean through the Atlantic inflow, especially during Heinrich stadials, the Mediterranean d18Ow gradient allowed us to identify other sources of freshwater to the eastern basin. One of these sources was probably the meltwater generated at the southern margin of the Fennoscandian ice-sheet that entered via the Caspian and Black seas. However, the proximity of core KC01B to the Adriatic Sea points to meltwater delivered from the Alpine ice-sheet and transported through the Po river into the Mediterranean as the main cause of the Ionian Sea 18O depletions.Publicación en abierto financiada por la Universidad de Salamanca como participante en el Acuerdo Transformativo CRUE-CSIC con Elsevier, 2021-2024Elsevier202420242021info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10366/159449reponame:GREDOS. Repositorio Institucional de la Universidad de Salamancainstname:Universidad de Salamanca (USAL)InglésAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:gredos.usal.es:10366/1594492026-06-07T06:28:51Z
dc.title.none.fl_str_mv Meltwater flux from northern ice-sheets to the mediterranean during MIS 12
title Meltwater flux from northern ice-sheets to the mediterranean during MIS 12
spellingShingle Meltwater flux from northern ice-sheets to the mediterranean during MIS 12
Alonso Azibeiro, Lucía
Mediterranean
Millennial climate variability
Freshwater
Meltwater
Palaeoceanography
Marine isotope stage 12
Foraminifera
Glacial
2506 Geología
title_short Meltwater flux from northern ice-sheets to the mediterranean during MIS 12
title_full Meltwater flux from northern ice-sheets to the mediterranean during MIS 12
title_fullStr Meltwater flux from northern ice-sheets to the mediterranean during MIS 12
title_full_unstemmed Meltwater flux from northern ice-sheets to the mediterranean during MIS 12
title_sort Meltwater flux from northern ice-sheets to the mediterranean during MIS 12
dc.creator.none.fl_str_mv Alonso Azibeiro, Lucía
Sierro Sánchez, Francisco Javier
Capotondi, Lucilla
Lirer, Fabrizio
Andersen, Nils
González Lanchas, Alba
Alonso García, Montserrat
Flores Villarejo, José Abel
Cortina, Aleix
Grimalt, Joan O.
Martrat, Belen
Cacho, Isabel
author Alonso Azibeiro, Lucía
author_facet Alonso Azibeiro, Lucía
Sierro Sánchez, Francisco Javier
Capotondi, Lucilla
Lirer, Fabrizio
Andersen, Nils
González Lanchas, Alba
Alonso García, Montserrat
Flores Villarejo, José Abel
Cortina, Aleix
Grimalt, Joan O.
Martrat, Belen
Cacho, Isabel
author_role author
author2 Sierro Sánchez, Francisco Javier
Capotondi, Lucilla
Lirer, Fabrizio
Andersen, Nils
González Lanchas, Alba
Alonso García, Montserrat
Flores Villarejo, José Abel
Cortina, Aleix
Grimalt, Joan O.
Martrat, Belen
Cacho, Isabel
author2_role author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Mediterranean
Millennial climate variability
Freshwater
Meltwater
Palaeoceanography
Marine isotope stage 12
Foraminifera
Glacial
2506 Geología
topic Mediterranean
Millennial climate variability
Freshwater
Meltwater
Palaeoceanography
Marine isotope stage 12
Foraminifera
Glacial
2506 Geología
description [EN] Planktonic foraminifer oxygen isotopes through MIS 12 were analysed from Ocean Drilling Program Site 977 in the Alboran Sea. After the correction of the sea surface temperature (SST) effect on the d18O composition of foraminiferal calcite, the resulting seawater d18O (d18Ow) was used to reconstruct variations in the d18Ow of the Atlantic inflow into the Mediterranean. A synchronous record from the KC01B core, in the Ionian Sea, was used to evaluate changes in the oxygen isotope gradient within the Mediterranean due to hydrological variations during MIS 12. Instead of the glacial d18Ow enrichment expected for the Mediterranean, lower values than today have been observed both in the Alboran and the Ionian seas, especially between 455 ka and the end of MIS 12 (424 ka). These negative oxygen isotope anomalies must have been caused by a flux of freshwater to the Mediterranean during MIS 12. Although the largest fraction of the freshwater anomalies entered the Mediterranean through the Atlantic inflow, especially during Heinrich stadials, the Mediterranean d18Ow gradient allowed us to identify other sources of freshwater to the eastern basin. One of these sources was probably the meltwater generated at the southern margin of the Fennoscandian ice-sheet that entered via the Caspian and Black seas. However, the proximity of core KC01B to the Adriatic Sea points to meltwater delivered from the Alpine ice-sheet and transported through the Po river into the Mediterranean as the main cause of the Ionian Sea 18O depletions.
publishDate 2021
dc.date.none.fl_str_mv 2021
2024
2024
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 http://hdl.handle.net/10366/159449
url http://hdl.handle.net/10366/159449
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:GREDOS. Repositorio Institucional de la Universidad de Salamanca
instname:Universidad de Salamanca (USAL)
instname_str Universidad de Salamanca (USAL)
reponame_str GREDOS. Repositorio Institucional de la Universidad de Salamanca
collection GREDOS. Repositorio Institucional de la Universidad de Salamanca
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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