Pliocene-Pleistocene oxygen isotope record DSDP Site 586, Ontong Java Plateau, Pacific Ocean i
Oceanographic changes in the western equatorial Pacific during the past 6 Ma are inferred from oxygen isotopic analyses of planktic and benthic foraminifera from Ontong Java Plateau (DSDP Site 586). The taxa are Globigerinoides sacculifer, Pulleniatina, Cibicidoides wuellerstorfi, and Oridorsalis um...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.683836 2023-05-15T13:42:09+02:00 Pliocene-Pleistocene oxygen isotope record DSDP Site 586, Ontong Java Plateau, Pacific Ocean i Whitman, Jill M Berger, Wolfgang H LATITUDE: -0.497300 * LONGITUDE: 158.498200 * DATE/TIME START: 1982-11-19T00:00:00 * DATE/TIME END: 1982-11-19T00:00:00 1992-02-25 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.683836 https://doi.org/10.1594/PANGAEA.683836 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.683836 https://doi.org/10.1594/PANGAEA.683836 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Whitman, Jill M; Berger, Wolfgang H (1992): Pliocene-Pleistocene oxygen isotope record Site 586, Ontong Java Plateau. Marine Micropaleontology, 18(3), 171-198, https://doi.org/10.1016/0377-8398(92)90012-9 89-586_Site COMPCORE Composite Core Deep Sea Drilling Project DSDP Glomar Challenger Leg89 South Pacific Dataset 1992 ftpangaea https://doi.org/10.1594/PANGAEA.683836 https://doi.org/10.1016/0377-8398(92)90012-9 2023-01-20T07:31:07Z Oceanographic changes in the western equatorial Pacific during the past 6 Ma are inferred from oxygen isotopic analyses of planktic and benthic foraminifera from Ontong Java Plateau (DSDP Site 586). The taxa are Globigerinoides sacculifer, Pulleniatina, Cibicidoides wuellerstorfi, and Oridorsalis umbonatus. Cooling and ice buildup are indicated by an 18O enrichment of 0.3 per mil in the planktic species near 3.4 Ma. This shift apparently is compensated in the benthic data by a warming of the deep waters by between 1° and 2° C. We suggest that the dominant source of upper deep water supply to the Pacific changed from Antarctic to North Atlantic at that time, the North Atlantic-derived water being warmer. Near 2.8 Ma (approximately) the planktic foraminifera again record an enrichment in 18O (Delta delta18O=0.25 per mil). We suggest ice buildup in the northern hemisphere as the cause, because of subsequent sharp increase in fluctuations of the delta18O signal, that is, instability. The enrichment is magnified in the benthic foraminifera (Delta delta18O = 0.5 per mil) by a cooling of the deep water by 1.5° at the time, presumably signalling a glacial-type reduction of North Atlantic Deep Water (NADW) production. Episodic divergence between the signals of G. sacculifer and Pulleniatina in the Pleistocene apparently reflects periods of increased upwelling in the western equatorial Pacific. The amplitude of ice volume fluctuations cannot be reconstructed from delta18O data alone, unless there are constraints on temperature variations. The increase in amplitude of fluctuation of the benthic and planktic signals during the Pleistocene may be attributed either to an increase in maximum ice volume, or to an increase in the fractionation of continental ice, or a combination of both causes. Dataset Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Pacific ENVELOPE(158.498200,158.498200,-0.497300,-0.497300) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
89-586_Site COMPCORE Composite Core Deep Sea Drilling Project DSDP Glomar Challenger Leg89 South Pacific |
spellingShingle |
89-586_Site COMPCORE Composite Core Deep Sea Drilling Project DSDP Glomar Challenger Leg89 South Pacific Whitman, Jill M Berger, Wolfgang H Pliocene-Pleistocene oxygen isotope record DSDP Site 586, Ontong Java Plateau, Pacific Ocean i |
topic_facet |
89-586_Site COMPCORE Composite Core Deep Sea Drilling Project DSDP Glomar Challenger Leg89 South Pacific |
description |
Oceanographic changes in the western equatorial Pacific during the past 6 Ma are inferred from oxygen isotopic analyses of planktic and benthic foraminifera from Ontong Java Plateau (DSDP Site 586). The taxa are Globigerinoides sacculifer, Pulleniatina, Cibicidoides wuellerstorfi, and Oridorsalis umbonatus. Cooling and ice buildup are indicated by an 18O enrichment of 0.3 per mil in the planktic species near 3.4 Ma. This shift apparently is compensated in the benthic data by a warming of the deep waters by between 1° and 2° C. We suggest that the dominant source of upper deep water supply to the Pacific changed from Antarctic to North Atlantic at that time, the North Atlantic-derived water being warmer. Near 2.8 Ma (approximately) the planktic foraminifera again record an enrichment in 18O (Delta delta18O=0.25 per mil). We suggest ice buildup in the northern hemisphere as the cause, because of subsequent sharp increase in fluctuations of the delta18O signal, that is, instability. The enrichment is magnified in the benthic foraminifera (Delta delta18O = 0.5 per mil) by a cooling of the deep water by 1.5° at the time, presumably signalling a glacial-type reduction of North Atlantic Deep Water (NADW) production. Episodic divergence between the signals of G. sacculifer and Pulleniatina in the Pleistocene apparently reflects periods of increased upwelling in the western equatorial Pacific. The amplitude of ice volume fluctuations cannot be reconstructed from delta18O data alone, unless there are constraints on temperature variations. The increase in amplitude of fluctuation of the benthic and planktic signals during the Pleistocene may be attributed either to an increase in maximum ice volume, or to an increase in the fractionation of continental ice, or a combination of both causes. |
format |
Dataset |
author |
Whitman, Jill M Berger, Wolfgang H |
author_facet |
Whitman, Jill M Berger, Wolfgang H |
author_sort |
Whitman, Jill M |
title |
Pliocene-Pleistocene oxygen isotope record DSDP Site 586, Ontong Java Plateau, Pacific Ocean i |
title_short |
Pliocene-Pleistocene oxygen isotope record DSDP Site 586, Ontong Java Plateau, Pacific Ocean i |
title_full |
Pliocene-Pleistocene oxygen isotope record DSDP Site 586, Ontong Java Plateau, Pacific Ocean i |
title_fullStr |
Pliocene-Pleistocene oxygen isotope record DSDP Site 586, Ontong Java Plateau, Pacific Ocean i |
title_full_unstemmed |
Pliocene-Pleistocene oxygen isotope record DSDP Site 586, Ontong Java Plateau, Pacific Ocean i |
title_sort |
pliocene-pleistocene oxygen isotope record dsdp site 586, ontong java plateau, pacific ocean i |
publisher |
PANGAEA |
publishDate |
1992 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.683836 https://doi.org/10.1594/PANGAEA.683836 |
op_coverage |
LATITUDE: -0.497300 * LONGITUDE: 158.498200 * DATE/TIME START: 1982-11-19T00:00:00 * DATE/TIME END: 1982-11-19T00:00:00 |
long_lat |
ENVELOPE(158.498200,158.498200,-0.497300,-0.497300) |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
op_source |
Supplement to: Whitman, Jill M; Berger, Wolfgang H (1992): Pliocene-Pleistocene oxygen isotope record Site 586, Ontong Java Plateau. Marine Micropaleontology, 18(3), 171-198, https://doi.org/10.1016/0377-8398(92)90012-9 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.683836 https://doi.org/10.1594/PANGAEA.683836 |
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.683836 https://doi.org/10.1016/0377-8398(92)90012-9 |
_version_ |
1766163294000775168 |