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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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:4636 2023-05-15T17:33:50+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 text http://eprints.esc.cam.ac.uk/4636/ http://eprints.esc.cam.ac.uk/4636/1/1-s2.0-S0277379119305773-main.pdf https://doi.org/10.1016/j.quascirev.2019.106139 en eng Elsevier http://eprints.esc.cam.ac.uk/4636/1/1-s2.0-S0277379119305773-main.pdf Ausín, Blanca and Hodell, David A. and Cutmore, Anna and Eglinton, Timothy I. (2020) The impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern Iberian margin. Quaternary Science Reviews, 230. p. 106139. ISSN 02773791 DOI https://doi.org/10.1016/j.quascirev.2019.106139 <https://doi.org/10.1016/j.quascirev.2019.106139> cc_by CC-BY 01 - Climate Change and Earth-Ocean Atmosphere Systems Article PeerReviewed 2020 ftucambridgeesc https://doi.org/10.1016/j.quascirev.2019.106139 2020-08-27T18:10:05Z 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. Article in Journal/Newspaper North Atlantic University of Cambridge, Department of Earth Sciences: ESC Publications Quaternary Science Reviews 230 106139 |
institution |
Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
spellingShingle |
01 - Climate Change and Earth-Ocean Atmosphere Systems 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 |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
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. |
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 |
http://eprints.esc.cam.ac.uk/4636/ http://eprints.esc.cam.ac.uk/4636/1/1-s2.0-S0277379119305773-main.pdf https://doi.org/10.1016/j.quascirev.2019.106139 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://eprints.esc.cam.ac.uk/4636/1/1-s2.0-S0277379119305773-main.pdf Ausín, Blanca and Hodell, David A. and Cutmore, Anna and Eglinton, Timothy I. (2020) The impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern Iberian margin. Quaternary Science Reviews, 230. p. 106139. ISSN 02773791 DOI https://doi.org/10.1016/j.quascirev.2019.106139 <https://doi.org/10.1016/j.quascirev.2019.106139> |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.quascirev.2019.106139 |
container_title |
Quaternary Science Reviews |
container_volume |
230 |
container_start_page |
106139 |
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1766132461876543488 |