Geochemistry and sea-surface temperature reconstruction for sediment cores of the Iberian Margin
Biogenic records of the marine palaeoproductivity (carbonates, organic carbon, and C37 alkenones) and the molecular stratigraphy of past sea surface temperatures (SSTs; UK'37) were studied at high resolution in two cores of the Iberian Margin. The comparison of these records indicates that the...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.736599 2023-05-15T17:36:39+02:00 Geochemistry and sea-surface temperature reconstruction for sediment cores of the Iberian Margin Pailler, Delphine Bard, Edouard MEDIAN LATITUDE: 39.190833 * MEDIAN LONGITUDE: -10.013833 * SOUTH-BOUND LATITUDE: 37.799833 * WEST-BOUND LONGITUDE: -10.166500 * NORTH-BOUND LATITUDE: 40.581833 * EAST-BOUND LONGITUDE: -9.861167 * DATE/TIME START: 1995-07-07T00:00:00 * DATE/TIME END: 1995-07-09T00:00:00 2002-04-09 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.736599 https://doi.org/10.1594/PANGAEA.736599 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.736599 https://doi.org/10.1594/PANGAEA.736599 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Pailler, Delphine; Bard, Edouard (2002): High frequency palaeoceanographic changes during the past 140000 yr recorded by the organic matter in sediments of the Iberian Margin. Palaeogeography, Palaeoclimatology, Palaeoecology, 181(4), 431-452, https://doi.org/10.1016/S0031-0182(01)00444-8 CALYPSO Calypso Corer IMAGES IMAGES I International Marine Global Change Study Marge Ibérique Marion Dufresne (1995) MD101 MD952040 MD95-2040 MD952042 MD95-2042 Porto Seamount Dataset 2002 ftpangaea https://doi.org/10.1594/PANGAEA.736599 https://doi.org/10.1016/S0031-0182(01)00444-8 2023-01-20T07:31:44Z Biogenic records of the marine palaeoproductivity (carbonates, organic carbon, and C37 alkenones) and the molecular stratigraphy of past sea surface temperatures (SSTs; UK'37) were studied at high resolution in two cores of the Iberian Margin. The comparison of these records indicates that the oceanographic conditions switched abruptly during the past 160 kyr between three kinds of regimes. A first regime with high (17-22°C) SST and low productivity typifies the interglacial periods, marine isotopic stages (MIS) 5 and 1. Several periods during MIS 6, 2, and the terminations II and I are characterised by about 4-5°C colder SST and a higher organic matter accumulation, both of which define the second regime. This anticorrelation between SST and marine productivity suggests that these variations are related to the intensity of the coastal upwelling. By contrast with this upwelling behaviour, extremely low biological productivity and very cold SST (6-12°C) occurred during short phases of glacial MIS 6, 4, and 2, and as abrupt events (~1 kyr or less) during MIS 3. The three oceanographic regimes are consistent with micropalaeontological changes in the same cores based on foraminifera and diatoms. The general trend of these hydrologic changes follows the long-term glacial/interglacial cycle, but the millennium scale variability is clearly related to Heinrich events and Dansgaard-Oeschger cycles. Strengthening of the upwelling corresponds probably to an intensification of the subtropical atmospheric circulation over the North Atlantic which was influenced by the presence of continental ice sheets. However, extreme glacial conditions due to massive discharges of icebergs interrupted the upwelling. Interestingly, both terminations II and I coincided with strong but transient intensification of the upwelling. Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-10.166500,-9.861167,40.581833,37.799833) |
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 Marge Ibérique Marion Dufresne (1995) MD101 MD952040 MD95-2040 MD952042 MD95-2042 Porto Seamount |
spellingShingle |
CALYPSO Calypso Corer IMAGES IMAGES I International Marine Global Change Study Marge Ibérique Marion Dufresne (1995) MD101 MD952040 MD95-2040 MD952042 MD95-2042 Porto Seamount Pailler, Delphine Bard, Edouard Geochemistry and sea-surface temperature reconstruction for sediment cores of the Iberian Margin |
topic_facet |
CALYPSO Calypso Corer IMAGES IMAGES I International Marine Global Change Study Marge Ibérique Marion Dufresne (1995) MD101 MD952040 MD95-2040 MD952042 MD95-2042 Porto Seamount |
description |
Biogenic records of the marine palaeoproductivity (carbonates, organic carbon, and C37 alkenones) and the molecular stratigraphy of past sea surface temperatures (SSTs; UK'37) were studied at high resolution in two cores of the Iberian Margin. The comparison of these records indicates that the oceanographic conditions switched abruptly during the past 160 kyr between three kinds of regimes. A first regime with high (17-22°C) SST and low productivity typifies the interglacial periods, marine isotopic stages (MIS) 5 and 1. Several periods during MIS 6, 2, and the terminations II and I are characterised by about 4-5°C colder SST and a higher organic matter accumulation, both of which define the second regime. This anticorrelation between SST and marine productivity suggests that these variations are related to the intensity of the coastal upwelling. By contrast with this upwelling behaviour, extremely low biological productivity and very cold SST (6-12°C) occurred during short phases of glacial MIS 6, 4, and 2, and as abrupt events (~1 kyr or less) during MIS 3. The three oceanographic regimes are consistent with micropalaeontological changes in the same cores based on foraminifera and diatoms. The general trend of these hydrologic changes follows the long-term glacial/interglacial cycle, but the millennium scale variability is clearly related to Heinrich events and Dansgaard-Oeschger cycles. Strengthening of the upwelling corresponds probably to an intensification of the subtropical atmospheric circulation over the North Atlantic which was influenced by the presence of continental ice sheets. However, extreme glacial conditions due to massive discharges of icebergs interrupted the upwelling. Interestingly, both terminations II and I coincided with strong but transient intensification of the upwelling. |
format |
Dataset |
author |
Pailler, Delphine Bard, Edouard |
author_facet |
Pailler, Delphine Bard, Edouard |
author_sort |
Pailler, Delphine |
title |
Geochemistry and sea-surface temperature reconstruction for sediment cores of the Iberian Margin |
title_short |
Geochemistry and sea-surface temperature reconstruction for sediment cores of the Iberian Margin |
title_full |
Geochemistry and sea-surface temperature reconstruction for sediment cores of the Iberian Margin |
title_fullStr |
Geochemistry and sea-surface temperature reconstruction for sediment cores of the Iberian Margin |
title_full_unstemmed |
Geochemistry and sea-surface temperature reconstruction for sediment cores of the Iberian Margin |
title_sort |
geochemistry and sea-surface temperature reconstruction for sediment cores of the iberian margin |
publisher |
PANGAEA |
publishDate |
2002 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.736599 https://doi.org/10.1594/PANGAEA.736599 |
op_coverage |
MEDIAN LATITUDE: 39.190833 * MEDIAN LONGITUDE: -10.013833 * SOUTH-BOUND LATITUDE: 37.799833 * WEST-BOUND LONGITUDE: -10.166500 * NORTH-BOUND LATITUDE: 40.581833 * EAST-BOUND LONGITUDE: -9.861167 * DATE/TIME START: 1995-07-07T00:00:00 * DATE/TIME END: 1995-07-09T00:00:00 |
long_lat |
ENVELOPE(-10.166500,-9.861167,40.581833,37.799833) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Pailler, Delphine; Bard, Edouard (2002): High frequency palaeoceanographic changes during the past 140000 yr recorded by the organic matter in sediments of the Iberian Margin. Palaeogeography, Palaeoclimatology, Palaeoecology, 181(4), 431-452, https://doi.org/10.1016/S0031-0182(01)00444-8 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.736599 https://doi.org/10.1594/PANGAEA.736599 |
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.736599 https://doi.org/10.1016/S0031-0182(01)00444-8 |
_version_ |
1766136209726242816 |