The impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern Iberian margin
This study combines high-resolution records of nannofossil abundances, oxygen and carbon stable isotopes, core scanning X-ray fluorescence (XRF), and ice rafted debris (IRD) to assess the paleoceanographic changes that occurred during the last deglaciation on the SW Iberian Margin. Our results revea...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/390102 2023-05-15T17:30:53+02:00 The impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern Iberian margin Ausín, Blanca Hodell, David A. Cutmore, Anna Eglinton, Timothy I. 2020-02-15 application/application/pdf https://hdl.handle.net/20.500.11850/390102 https://doi.org/10.3929/ethz-b-000390102 en eng Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2019.106139 info:eu-repo/semantics/altIdentifier/wos/000514754000005 info:eu-repo/grantAgreement/SNF/Projekte MINT/175823 http://hdl.handle.net/20.500.11850/390102 doi:10.3929/ethz-b-000390102 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International CC-BY Quaternary Science Reviews, 230 Paleoceanography North Atlantic Holocene Deglaciation Heinrich stadials Nannofossils IRD Stable isotopes AMOC info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 ftethz https://doi.org/20.500.11850/390102 https://doi.org/10.3929/ethz-b-000390102 https://doi.org/10.1016/j.quascirev.2019.106139 2023-02-13T00:50:23Z This study combines high-resolution records of nannofossil abundances, oxygen and carbon stable isotopes, core scanning X-ray fluorescence (XRF), and ice rafted debris (IRD) to assess the paleoceanographic changes that occurred during the last deglaciation on the SW Iberian Margin. Our results reveal parallel centennial-scale oscillations in coccolithophore productivity, nutricline depth and upwelling phenomena not previously observed, explained by means of arrival of iceberg-melting waters, iceberg-induced turbulent conditions, SST changes and riverine discharges. On millennial time-scales, higher primary productivity (PP), shallower nutricline, and upwelling occurrence/invigoration are observed for the Last Glacial Maximum (LGM) and Bølling-Allerød (B/A). The opposite scenario (i.e., lower productivity, deeper nutricline and upwelling weakening/absence) is linked to cold spells such as Heinrich Stadials 2 and 1 (HS2 and HS1) and the Younger Dryas (YD). Such paleoproductivity variations are attributed to latitudinal migrations of the thermal fronts associated with oceanic gyres in the North Atlantic, in parallel to oscillations in the strength of the Atlantic Meridional Overturning Circulation (AMOC). Moderate-to-high PP during the Holocene is ascribed to the development of the modern seasonal surface hydrography, with a more persistent Iberian Poleward Current (IPC) and seasonal wind-induced upwelling. ISSN:0277-3791 Article in Journal/Newspaper North Atlantic ETH Zürich Research Collection |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
Paleoceanography North Atlantic Holocene Deglaciation Heinrich stadials Nannofossils IRD Stable isotopes AMOC |
spellingShingle |
Paleoceanography North Atlantic Holocene Deglaciation Heinrich stadials Nannofossils IRD Stable isotopes AMOC Ausín, Blanca Hodell, David A. Cutmore, Anna Eglinton, Timothy I. The impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern Iberian margin |
topic_facet |
Paleoceanography North Atlantic Holocene Deglaciation Heinrich stadials Nannofossils IRD Stable isotopes AMOC |
description |
This study combines high-resolution records of nannofossil abundances, oxygen and carbon stable isotopes, core scanning X-ray fluorescence (XRF), and ice rafted debris (IRD) to assess the paleoceanographic changes that occurred during the last deglaciation on the SW Iberian Margin. Our results reveal parallel centennial-scale oscillations in coccolithophore productivity, nutricline depth and upwelling phenomena not previously observed, explained by means of arrival of iceberg-melting waters, iceberg-induced turbulent conditions, SST changes and riverine discharges. On millennial time-scales, higher primary productivity (PP), shallower nutricline, and upwelling occurrence/invigoration are observed for the Last Glacial Maximum (LGM) and Bølling-Allerød (B/A). The opposite scenario (i.e., lower productivity, deeper nutricline and upwelling weakening/absence) is linked to cold spells such as Heinrich Stadials 2 and 1 (HS2 and HS1) and the Younger Dryas (YD). Such paleoproductivity variations are attributed to latitudinal migrations of the thermal fronts associated with oceanic gyres in the North Atlantic, in parallel to oscillations in the strength of the Atlantic Meridional Overturning Circulation (AMOC). Moderate-to-high PP during the Holocene is ascribed to the development of the modern seasonal surface hydrography, with a more persistent Iberian Poleward Current (IPC) and seasonal wind-induced upwelling. ISSN:0277-3791 |
format |
Article in Journal/Newspaper |
author |
Ausín, Blanca Hodell, David A. Cutmore, Anna Eglinton, Timothy I. |
author_facet |
Ausín, Blanca Hodell, David A. Cutmore, Anna Eglinton, Timothy I. |
author_sort |
Ausín, Blanca |
title |
The impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern Iberian margin |
title_short |
The impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern Iberian margin |
title_full |
The impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern Iberian margin |
title_fullStr |
The impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern Iberian margin |
title_full_unstemmed |
The impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern Iberian margin |
title_sort |
impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern iberian margin |
publisher |
Elsevier |
publishDate |
2020 |
url |
https://hdl.handle.net/20.500.11850/390102 https://doi.org/10.3929/ethz-b-000390102 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Quaternary Science Reviews, 230 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2019.106139 info:eu-repo/semantics/altIdentifier/wos/000514754000005 info:eu-repo/grantAgreement/SNF/Projekte MINT/175823 http://hdl.handle.net/20.500.11850/390102 doi:10.3929/ethz-b-000390102 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11850/390102 https://doi.org/10.3929/ethz-b-000390102 https://doi.org/10.1016/j.quascirev.2019.106139 |
_version_ |
1766128006758137856 |