Planktonic foraminifera abundance, stable isotope record and temperature reconstruction of sediment core MD95-2040
High-resolution palaeoclimate records recovered from the Iberian margin in core MD95-2040 exhibit large fluctuations in oceanographic conditions over the last 190 ka. Large-scale cooling of the surface ocean is indicated by the presence of the polar planktonic foraminifer Neogloboquadrina pachyderma...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.733309 2023-05-15T16:29:59+02:00 Planktonic foraminifera abundance, stable isotope record and temperature reconstruction of sediment core MD95-2040 de Abreu, Lucia Shackleton, Nicholas J Schönfeld, Joachim Hall, Michael A Chapman, Mark R LATITUDE: 40.581833 * LONGITUDE: -9.861167 * DATE/TIME START: 1995-07-07T00:00:00 * DATE/TIME END: 1995-07-07T00:00:00 2003-02-01 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.733309 https://doi.org/10.1594/PANGAEA.733309 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.733309 https://doi.org/10.1594/PANGAEA.733309 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: de Abreu, Lucia; Shackleton, Nicholas J; Schönfeld, Joachim; Hall, Michael A; Chapman, Mark R (2003): Millenial-scale oceanic climate variability off the Western Iberian margin during the last two glacial periods. Marine Geology, 196(1-2), 1-20, https://doi.org/10.1016/S0025-3227(03)00046-X CALYPSO Calypso Corer IMAGES IMAGES I International Marine Global Change Study Marion Dufresne (1995) MD101 MD952040 MD95-2040 Porto Seamount Dataset 2003 ftpangaea https://doi.org/10.1594/PANGAEA.733309 https://doi.org/10.1016/S0025-3227(03)00046-X 2023-01-20T07:31:37Z High-resolution palaeoclimate records recovered from the Iberian margin in core MD95-2040 exhibit large fluctuations in oceanographic conditions over the last 190 ka. Large-scale cooling of the surface ocean is indicated by the presence of the polar planktonic foraminifer Neogloboquadrina pachyderma (sinistral), and in some instances the occurrence of ice-rafted debris (IRD). Ice-rafting episodes were prevalent in both of the last two glacials with greater intensity in Stages 2 through 4, than in Stage 6. The six youngest Heinrich events are well defined during the last glacial but detrital carbonate is absent from Heinrich layers HL6, HL5 and HL3. Dansgaard-Oeschger stadial-equivalent sub-millennial IRD deposition events have been detected, in particular during Stage 3, allowing a good match with the cooling displayed in the Greenland ice core (GISP2). Sea-surface temperature off Portugal in Stage 6 was in general warmer than during the last glacial, pointing towards a weaker southward influence of polar water masses. Ice rafting occurred mainly in mid-MIS (Marine Isotope Stage) 6 (between 173 and 153 kyr) as a group of poorly differentiated, short-duration quasi-continuous events, mainly marked by the high abundance of sinistral N. pachyderma. Differences exist in IRD composition relative to the last glacial, with a reduced Canadian-derived detrital carbonate component, combined with an important contribution of volcanic particles. The lower magnitude and higher frequency of these events suggest that the higher temperatures would have induced iceberg waning closer to the source areas. Dataset Greenland Greenland ice core ice core Neogloboquadrina pachyderma Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science Greenland ENVELOPE(-9.861167,-9.861167,40.581833,40.581833) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
CALYPSO Calypso Corer IMAGES IMAGES I International Marine Global Change Study Marion Dufresne (1995) MD101 MD952040 MD95-2040 Porto Seamount |
spellingShingle |
CALYPSO Calypso Corer IMAGES IMAGES I International Marine Global Change Study Marion Dufresne (1995) MD101 MD952040 MD95-2040 Porto Seamount de Abreu, Lucia Shackleton, Nicholas J Schönfeld, Joachim Hall, Michael A Chapman, Mark R Planktonic foraminifera abundance, stable isotope record and temperature reconstruction of sediment core MD95-2040 |
topic_facet |
CALYPSO Calypso Corer IMAGES IMAGES I International Marine Global Change Study Marion Dufresne (1995) MD101 MD952040 MD95-2040 Porto Seamount |
description |
High-resolution palaeoclimate records recovered from the Iberian margin in core MD95-2040 exhibit large fluctuations in oceanographic conditions over the last 190 ka. Large-scale cooling of the surface ocean is indicated by the presence of the polar planktonic foraminifer Neogloboquadrina pachyderma (sinistral), and in some instances the occurrence of ice-rafted debris (IRD). Ice-rafting episodes were prevalent in both of the last two glacials with greater intensity in Stages 2 through 4, than in Stage 6. The six youngest Heinrich events are well defined during the last glacial but detrital carbonate is absent from Heinrich layers HL6, HL5 and HL3. Dansgaard-Oeschger stadial-equivalent sub-millennial IRD deposition events have been detected, in particular during Stage 3, allowing a good match with the cooling displayed in the Greenland ice core (GISP2). Sea-surface temperature off Portugal in Stage 6 was in general warmer than during the last glacial, pointing towards a weaker southward influence of polar water masses. Ice rafting occurred mainly in mid-MIS (Marine Isotope Stage) 6 (between 173 and 153 kyr) as a group of poorly differentiated, short-duration quasi-continuous events, mainly marked by the high abundance of sinistral N. pachyderma. Differences exist in IRD composition relative to the last glacial, with a reduced Canadian-derived detrital carbonate component, combined with an important contribution of volcanic particles. The lower magnitude and higher frequency of these events suggest that the higher temperatures would have induced iceberg waning closer to the source areas. |
format |
Dataset |
author |
de Abreu, Lucia Shackleton, Nicholas J Schönfeld, Joachim Hall, Michael A Chapman, Mark R |
author_facet |
de Abreu, Lucia Shackleton, Nicholas J Schönfeld, Joachim Hall, Michael A Chapman, Mark R |
author_sort |
de Abreu, Lucia |
title |
Planktonic foraminifera abundance, stable isotope record and temperature reconstruction of sediment core MD95-2040 |
title_short |
Planktonic foraminifera abundance, stable isotope record and temperature reconstruction of sediment core MD95-2040 |
title_full |
Planktonic foraminifera abundance, stable isotope record and temperature reconstruction of sediment core MD95-2040 |
title_fullStr |
Planktonic foraminifera abundance, stable isotope record and temperature reconstruction of sediment core MD95-2040 |
title_full_unstemmed |
Planktonic foraminifera abundance, stable isotope record and temperature reconstruction of sediment core MD95-2040 |
title_sort |
planktonic foraminifera abundance, stable isotope record and temperature reconstruction of sediment core md95-2040 |
publisher |
PANGAEA |
publishDate |
2003 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.733309 https://doi.org/10.1594/PANGAEA.733309 |
op_coverage |
LATITUDE: 40.581833 * LONGITUDE: -9.861167 * DATE/TIME START: 1995-07-07T00:00:00 * DATE/TIME END: 1995-07-07T00:00:00 |
long_lat |
ENVELOPE(-9.861167,-9.861167,40.581833,40.581833) |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core ice core Neogloboquadrina pachyderma Planktonic foraminifera |
genre_facet |
Greenland Greenland ice core ice core Neogloboquadrina pachyderma Planktonic foraminifera |
op_source |
Supplement to: de Abreu, Lucia; Shackleton, Nicholas J; Schönfeld, Joachim; Hall, Michael A; Chapman, Mark R (2003): Millenial-scale oceanic climate variability off the Western Iberian margin during the last two glacial periods. Marine Geology, 196(1-2), 1-20, https://doi.org/10.1016/S0025-3227(03)00046-X |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.733309 https://doi.org/10.1594/PANGAEA.733309 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.733309 https://doi.org/10.1016/S0025-3227(03)00046-X |
_version_ |
1766019696699637760 |