Climate and vegetation changes 180,000 to 345,000 years ago recorded in a deep-sea core off Portugal
A new high-resolution combined marine proxy-pollen sequence from the Portuguese margin, MD01-2443, enables direct comparison of ocean and ice volume changes with vegetation development in south-west Iberia during marine isotope stages (MIS) 7, 8 and 9. Changes in sea surface conditions on both orbit...
Published in: | Earth and Planetary Science Letters |
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Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2006
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/climate-and-vegetation-changes-180000-to-345000-years-ago-recorded-in-a-deepsea-core-off-portugal(87363e3f-e74f-4c07-93f2-09e4f1c8fc23).html https://doi.org/10.1016/j.epsl.2006.07.005 |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/87363e3f-e74f-4c07-93f2-09e4f1c8fc23 2024-06-23T07:46:18+00:00 Climate and vegetation changes 180,000 to 345,000 years ago recorded in a deep-sea core off Portugal Roucoux, K. H. Tzedakis, P. C. de Abreu, L. Shackleton, N. J. 2006-09-30 https://research-portal.st-andrews.ac.uk/en/researchoutput/climate-and-vegetation-changes-180000-to-345000-years-ago-recorded-in-a-deepsea-core-off-portugal(87363e3f-e74f-4c07-93f2-09e4f1c8fc23).html https://doi.org/10.1016/j.epsl.2006.07.005 eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/climate-and-vegetation-changes-180000-to-345000-years-ago-recorded-in-a-deepsea-core-off-portugal(87363e3f-e74f-4c07-93f2-09e4f1c8fc23).html info:eu-repo/semantics/restrictedAccess Roucoux , K H , Tzedakis , P C , de Abreu , L & Shackleton , N J 2006 , ' Climate and vegetation changes 180,000 to 345,000 years ago recorded in a deep-sea core off Portugal ' , Earth and Planetary Science Letters , vol. 249 , no. 3-4 , pp. 307-325 . https://doi.org/10.1016/j.epsl.2006.07.005 North Atlantic Portugal marine palynology MIS 7 MIS 8 MIS 9 land-ocean correlation WESTERN IBERIAN MARGIN NORTH-ATLANTIC OCEAN ISOTOPE SUBSTAGE 5E LAST GLACIAL PERIOD CONTINENTAL-MARGIN POLLEN TRANSPORT HEINRICH EVENTS ICE CORE MARINE VARIABILITY article 2006 ftunstandrewcris https://doi.org/10.1016/j.epsl.2006.07.005 2024-06-13T00:46:22Z A new high-resolution combined marine proxy-pollen sequence from the Portuguese margin, MD01-2443, enables direct comparison of ocean and ice volume changes with vegetation development in south-west Iberia during marine isotope stages (MIS) 7, 8 and 9. Changes in sea surface conditions on both orbital and millennial time scales are closely mirrored by forest extent, indicating a coherence of climate variability between the North Atlantic and south-west Iberia. Deglacial warming at the start of MIS 7 and 9 was interrupted by incursions of subpolar water masses at the site, accompanied by reversals in tree population expansion. During MIS 7e and 9e, the close relationship in timing and amplitude between vegetation and offshore conditions broke down: early forest collapse points to pronounced cooling and aridification on land which, although not accompanied by a change in water masses at the Portuguese margin, appears to have coincided with abrupt decreases in atmospheric methane concentration recorded in Antarctic ice cores. The most extreme glacial conditions of MIS 8 occurred during the early part, followed by an interval of warmer conditions and tree population expansion similar to 263 ka. This has sometimes been considered as indicating an early deglaciation, but the data presented here show that it was distinct from Termination III, which occurred later, in line with Milankovitch forcing. A sub-orbital oscillation in both isotopic and pollen records is observed at the end of MIS 7 (ca. 184 ka) which appears to be coeval with a recently identified sea level high stand. (c) 2006 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic ice core North Atlantic University of St Andrews: Research Portal Antarctic Earth and Planetary Science Letters 249 3-4 307 325 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
North Atlantic Portugal marine palynology MIS 7 MIS 8 MIS 9 land-ocean correlation WESTERN IBERIAN MARGIN NORTH-ATLANTIC OCEAN ISOTOPE SUBSTAGE 5E LAST GLACIAL PERIOD CONTINENTAL-MARGIN POLLEN TRANSPORT HEINRICH EVENTS ICE CORE MARINE VARIABILITY |
spellingShingle |
North Atlantic Portugal marine palynology MIS 7 MIS 8 MIS 9 land-ocean correlation WESTERN IBERIAN MARGIN NORTH-ATLANTIC OCEAN ISOTOPE SUBSTAGE 5E LAST GLACIAL PERIOD CONTINENTAL-MARGIN POLLEN TRANSPORT HEINRICH EVENTS ICE CORE MARINE VARIABILITY Roucoux, K. H. Tzedakis, P. C. de Abreu, L. Shackleton, N. J. Climate and vegetation changes 180,000 to 345,000 years ago recorded in a deep-sea core off Portugal |
topic_facet |
North Atlantic Portugal marine palynology MIS 7 MIS 8 MIS 9 land-ocean correlation WESTERN IBERIAN MARGIN NORTH-ATLANTIC OCEAN ISOTOPE SUBSTAGE 5E LAST GLACIAL PERIOD CONTINENTAL-MARGIN POLLEN TRANSPORT HEINRICH EVENTS ICE CORE MARINE VARIABILITY |
description |
A new high-resolution combined marine proxy-pollen sequence from the Portuguese margin, MD01-2443, enables direct comparison of ocean and ice volume changes with vegetation development in south-west Iberia during marine isotope stages (MIS) 7, 8 and 9. Changes in sea surface conditions on both orbital and millennial time scales are closely mirrored by forest extent, indicating a coherence of climate variability between the North Atlantic and south-west Iberia. Deglacial warming at the start of MIS 7 and 9 was interrupted by incursions of subpolar water masses at the site, accompanied by reversals in tree population expansion. During MIS 7e and 9e, the close relationship in timing and amplitude between vegetation and offshore conditions broke down: early forest collapse points to pronounced cooling and aridification on land which, although not accompanied by a change in water masses at the Portuguese margin, appears to have coincided with abrupt decreases in atmospheric methane concentration recorded in Antarctic ice cores. The most extreme glacial conditions of MIS 8 occurred during the early part, followed by an interval of warmer conditions and tree population expansion similar to 263 ka. This has sometimes been considered as indicating an early deglaciation, but the data presented here show that it was distinct from Termination III, which occurred later, in line with Milankovitch forcing. A sub-orbital oscillation in both isotopic and pollen records is observed at the end of MIS 7 (ca. 184 ka) which appears to be coeval with a recently identified sea level high stand. (c) 2006 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Roucoux, K. H. Tzedakis, P. C. de Abreu, L. Shackleton, N. J. |
author_facet |
Roucoux, K. H. Tzedakis, P. C. de Abreu, L. Shackleton, N. J. |
author_sort |
Roucoux, K. H. |
title |
Climate and vegetation changes 180,000 to 345,000 years ago recorded in a deep-sea core off Portugal |
title_short |
Climate and vegetation changes 180,000 to 345,000 years ago recorded in a deep-sea core off Portugal |
title_full |
Climate and vegetation changes 180,000 to 345,000 years ago recorded in a deep-sea core off Portugal |
title_fullStr |
Climate and vegetation changes 180,000 to 345,000 years ago recorded in a deep-sea core off Portugal |
title_full_unstemmed |
Climate and vegetation changes 180,000 to 345,000 years ago recorded in a deep-sea core off Portugal |
title_sort |
climate and vegetation changes 180,000 to 345,000 years ago recorded in a deep-sea core off portugal |
publishDate |
2006 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/climate-and-vegetation-changes-180000-to-345000-years-ago-recorded-in-a-deepsea-core-off-portugal(87363e3f-e74f-4c07-93f2-09e4f1c8fc23).html https://doi.org/10.1016/j.epsl.2006.07.005 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic ice core North Atlantic |
genre_facet |
Antarc* Antarctic ice core North Atlantic |
op_source |
Roucoux , K H , Tzedakis , P C , de Abreu , L & Shackleton , N J 2006 , ' Climate and vegetation changes 180,000 to 345,000 years ago recorded in a deep-sea core off Portugal ' , Earth and Planetary Science Letters , vol. 249 , no. 3-4 , pp. 307-325 . https://doi.org/10.1016/j.epsl.2006.07.005 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/climate-and-vegetation-changes-180000-to-345000-years-ago-recorded-in-a-deepsea-core-off-portugal(87363e3f-e74f-4c07-93f2-09e4f1c8fc23).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2006.07.005 |
container_title |
Earth and Planetary Science Letters |
container_volume |
249 |
container_issue |
3-4 |
container_start_page |
307 |
op_container_end_page |
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1802645104160145408 |