An exceptional record of millennial-scale climate variability in the southern Iberian Margin during MIS 6: Impact on the formation of sapropel S6
[EN] The study of planktic and benthic d18O at site U1389 in the Gulf of Cadiz allowed us to reconstruct climate variability during the penultimate glacial period at an unprecedented millennial scale resolution. Hereby, a sequence of interstadial-stadial episodes similar to the Dansgaard-Oeschger ev...
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Online Access: | http://hdl.handle.net/10366/159464 https://doi.org/10.1016/j.quascirev.2022.107527 |
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ftunivsalamanca:oai:gredos.usal.es:10366/159464 2024-09-30T14:23:12+00:00 An exceptional record of millennial-scale climate variability in the southern Iberian Margin during MIS 6: Impact on the formation of sapropel S6 Sierro Sánchez, Francisco Javier Andersen, Nils 2022 application/pdf http://hdl.handle.net/10366/159464 https://doi.org/10.1016/j.quascirev.2022.107527 eng eng Elsevier http://dx.doi.org/10.1016/j.quascirev.2022.107527 Sierro, F. J., & Andersen, N. (2022). An exceptional record of millennial-scale climate variability in the southern Iberian Margin during MIS 6: Impact on the formation of sapropel S6. Quaternary Science Reviews, 286, 107527. https://doi.org/10.1016/j.quascirev.2022.107527 0277-3791 http://hdl.handle.net/10366/159464 doi:10.1016/j.quascirev.2022.107527 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Mediterranean overflow MIS6 Penultimate glaciation Millennial climate change Sapropel Mediterranean overturning Meltwater Ice sheets 2506 Geología info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2022 ftunivsalamanca https://doi.org/10.1016/j.quascirev.2022.107527 2024-09-10T00:12:20Z [EN] The study of planktic and benthic d18O at site U1389 in the Gulf of Cadiz allowed us to reconstruct climate variability during the penultimate glacial period at an unprecedented millennial scale resolution. Hereby, a sequence of interstadial-stadial episodes similar to the Dansgaard-Oeschger events recorded during Marine Isotope Stage (MIS)3, were recognized in MIS6. After a detailed correlation with millennial-scale variability recorded along the Iberian margin and the North Atlantic we were able to link the millennial changes next to the Iberian Peninsula with Antarctic climate variability due to the interhemispheric seesaw response of the Atlantic circulation. The straight coupling at site U1389 of a) the planktic d18O that reflects climate change in the Atlantic with b) the benthic d18O, which records the temperature and oxygen isotope composition of the mixture of Mediterranean Outflow and Atlantic intermediate water, indicates that millennial climate variability also had a strong impact on the eastern Mediterranean. The detailed analysis of the benthic d13C and the fine sand content in the sediments from site U1389 led us to recognize the response of the Mediterranean overflow water (MOW) to millennial scale changes in Mediterranean overturning circulation during the penultimate glaciation. Both Mediterranean Overturning Circulation and MOW strength increased at times of cool and arid climates and weakened during warm and more humid episodes, similar to what has been described for MIS3. The tuning of MOW weakening events occurring at times of precession minima with eastern Mediterranean sapropels and enhanced Asian monsoon allowed the elaboration of a new chronology for MIS6. It was compared with the Epica Dome C time scale, which was also based on the tuning of atmospheric d18O with Asian Monsoons speleothem records. Mediterranean overturning during MIS6 was also strongly affected by freshwater perturbations occurring at times of insolation maxima, leading to the formation of the “glacial sapropel” ... Article in Journal/Newspaper Antarc* Antarctic Dansgaard-Oeschger events EPICA North Atlantic Universidad de Salamanca: Gredos (Gestión del Repositorio Documental de la Universidad de Salamanca) Antarctic Quaternary Science Reviews 286 107527 |
institution |
Open Polar |
collection |
Universidad de Salamanca: Gredos (Gestión del Repositorio Documental de la Universidad de Salamanca) |
op_collection_id |
ftunivsalamanca |
language |
English |
topic |
Mediterranean overflow MIS6 Penultimate glaciation Millennial climate change Sapropel Mediterranean overturning Meltwater Ice sheets 2506 Geología |
spellingShingle |
Mediterranean overflow MIS6 Penultimate glaciation Millennial climate change Sapropel Mediterranean overturning Meltwater Ice sheets 2506 Geología Sierro Sánchez, Francisco Javier Andersen, Nils An exceptional record of millennial-scale climate variability in the southern Iberian Margin during MIS 6: Impact on the formation of sapropel S6 |
topic_facet |
Mediterranean overflow MIS6 Penultimate glaciation Millennial climate change Sapropel Mediterranean overturning Meltwater Ice sheets 2506 Geología |
description |
[EN] The study of planktic and benthic d18O at site U1389 in the Gulf of Cadiz allowed us to reconstruct climate variability during the penultimate glacial period at an unprecedented millennial scale resolution. Hereby, a sequence of interstadial-stadial episodes similar to the Dansgaard-Oeschger events recorded during Marine Isotope Stage (MIS)3, were recognized in MIS6. After a detailed correlation with millennial-scale variability recorded along the Iberian margin and the North Atlantic we were able to link the millennial changes next to the Iberian Peninsula with Antarctic climate variability due to the interhemispheric seesaw response of the Atlantic circulation. The straight coupling at site U1389 of a) the planktic d18O that reflects climate change in the Atlantic with b) the benthic d18O, which records the temperature and oxygen isotope composition of the mixture of Mediterranean Outflow and Atlantic intermediate water, indicates that millennial climate variability also had a strong impact on the eastern Mediterranean. The detailed analysis of the benthic d13C and the fine sand content in the sediments from site U1389 led us to recognize the response of the Mediterranean overflow water (MOW) to millennial scale changes in Mediterranean overturning circulation during the penultimate glaciation. Both Mediterranean Overturning Circulation and MOW strength increased at times of cool and arid climates and weakened during warm and more humid episodes, similar to what has been described for MIS3. The tuning of MOW weakening events occurring at times of precession minima with eastern Mediterranean sapropels and enhanced Asian monsoon allowed the elaboration of a new chronology for MIS6. It was compared with the Epica Dome C time scale, which was also based on the tuning of atmospheric d18O with Asian Monsoons speleothem records. Mediterranean overturning during MIS6 was also strongly affected by freshwater perturbations occurring at times of insolation maxima, leading to the formation of the “glacial sapropel” ... |
format |
Article in Journal/Newspaper |
author |
Sierro Sánchez, Francisco Javier Andersen, Nils |
author_facet |
Sierro Sánchez, Francisco Javier Andersen, Nils |
author_sort |
Sierro Sánchez, Francisco Javier |
title |
An exceptional record of millennial-scale climate variability in the southern Iberian Margin during MIS 6: Impact on the formation of sapropel S6 |
title_short |
An exceptional record of millennial-scale climate variability in the southern Iberian Margin during MIS 6: Impact on the formation of sapropel S6 |
title_full |
An exceptional record of millennial-scale climate variability in the southern Iberian Margin during MIS 6: Impact on the formation of sapropel S6 |
title_fullStr |
An exceptional record of millennial-scale climate variability in the southern Iberian Margin during MIS 6: Impact on the formation of sapropel S6 |
title_full_unstemmed |
An exceptional record of millennial-scale climate variability in the southern Iberian Margin during MIS 6: Impact on the formation of sapropel S6 |
title_sort |
exceptional record of millennial-scale climate variability in the southern iberian margin during mis 6: impact on the formation of sapropel s6 |
publisher |
Elsevier |
publishDate |
2022 |
url |
http://hdl.handle.net/10366/159464 https://doi.org/10.1016/j.quascirev.2022.107527 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Dansgaard-Oeschger events EPICA North Atlantic |
genre_facet |
Antarc* Antarctic Dansgaard-Oeschger events EPICA North Atlantic |
op_relation |
http://dx.doi.org/10.1016/j.quascirev.2022.107527 Sierro, F. J., & Andersen, N. (2022). An exceptional record of millennial-scale climate variability in the southern Iberian Margin during MIS 6: Impact on the formation of sapropel S6. Quaternary Science Reviews, 286, 107527. https://doi.org/10.1016/j.quascirev.2022.107527 0277-3791 http://hdl.handle.net/10366/159464 doi:10.1016/j.quascirev.2022.107527 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2022.107527 |
container_title |
Quaternary Science Reviews |
container_volume |
286 |
container_start_page |
107527 |
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1811636738973499392 |