Mid-Pliocene Mg/Ca and clumped isotope bottom water temperatures from ODP Site 138-849 and IODP Site 303-U1308
The mid-Pliocene (3.3-3.0 million years ago) is an important possible analogue to future, warmer-than-present climates. This interval is the most recent period in Earth's history of sustained global warmth, when atmospheric CO2 concentrations were comparable to the early 21th century, global ic...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.960832 2023-07-30T04:05:19+02:00 Mid-Pliocene Mg/Ca and clumped isotope bottom water temperatures from ODP Site 138-849 and IODP Site 303-U1308 Braaten, Anna Hauge Jakob, Kim A Ho, Sze Ling Friedrich, Oliver Galaasen, Eirik Vinje De Schepper, Stijn Wilson, Paul A Meckler, Anna Nele MEDIAN LATITUDE: 25.030545 * MEDIAN LONGITUDE: -67.378220 * SOUTH-BOUND LATITUDE: 0.183330 * WEST-BOUND LONGITUDE: -110.518330 * NORTH-BOUND LATITUDE: 49.877760 * EAST-BOUND LONGITUDE: -24.238110 * DATE/TIME START: 1991-06-12T00:00:00 * DATE/TIME END: 2004-10-30T00:00:00 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.960832 en eng PANGAEA Braaten, Anna Hauge; Jakob, Kim A; Ho, Sze Ling; Friedrich, Oliver; Galaasen, Eirik Vinje; De Schepper, Stijn; Wilson, Paul A; Meckler, Anna Nele (in prep.): Limited exchange between the deep Pacific and Atlantic oceans during the warm mid-Pliocene and MIS M2 "glaciation". https://doi.pangaea.de/10.1594/PANGAEA.960832 Access constraints: access rights needed info:eu-repo/semantics/restrictedAccess bottom water temperature Clumped isotopes foraminifera Mg/Ca mid-Pliocene warm period MIS M2 stable isotope geochemistry Dataset ftpangaea 2023-07-14T05:35:27Z The mid-Pliocene (3.3-3.0 million years ago) is an important possible analogue to future, warmer-than-present climates. This interval is the most recent period in Earth's history of sustained global warmth, when atmospheric CO2 concentrations were comparable to the early 21th century, global ice volume was reduced and sea-levels were significantly higher than at present. Relatively few deep ocean temperature records exist from this time interval, but some available data suggest that large differences in temperatures existed between different deep ocean basins. This is in contrast to the modern ocean, which is relatively isothermal across the various basins at similar depth. In order to verify the possibility of a large temperature gradient between the deep Pacific and deep North Atlantic oceans, we generated new benthic foraminiferal carbonate clumped isotope (Δ47) and Mg/Ca bottom water temperatures from Pacific ODP Site 849 and North Atlantic IODP Site U1308. We find that the deep North Atlantic was significantly warmer (by 4°C) and likely more saline than the deep Pacific throughout our study interval, suggesting inefficient heat and salt transport from the Atlantic into the deep Pacific at this time. Our records also cover the enigmatic Marine Isotope Stage (MIS) M2 glacial event at 3.3 Ma, which represents the largest positive oxygen isotope excursion of the Pliocene prior to the intensification of Northern Hemisphere glaation.This event has been cited as a possible failed attempt at establishing Northern Hemisphere glacial-interglacial cycles. The amplitute of cooling observed in our temperature records suggest that much of the observed change in benthic δ18O can be attributed to cooling of the deep ocean rather than a substantial growth of ice on land. This data set contains final calculated bottom water temperatures from Δ47 from both study sites; Mg/Ca, Mn/Ca and Fe/Ca ratios and calculated Mg/Ca bottom water temperatures from both study sites and new stable isotope data from Site U1308. Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Pacific ENVELOPE(-110.518330,-24.238110,49.877760,0.183330) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
bottom water temperature Clumped isotopes foraminifera Mg/Ca mid-Pliocene warm period MIS M2 stable isotope geochemistry |
spellingShingle |
bottom water temperature Clumped isotopes foraminifera Mg/Ca mid-Pliocene warm period MIS M2 stable isotope geochemistry Braaten, Anna Hauge Jakob, Kim A Ho, Sze Ling Friedrich, Oliver Galaasen, Eirik Vinje De Schepper, Stijn Wilson, Paul A Meckler, Anna Nele Mid-Pliocene Mg/Ca and clumped isotope bottom water temperatures from ODP Site 138-849 and IODP Site 303-U1308 |
topic_facet |
bottom water temperature Clumped isotopes foraminifera Mg/Ca mid-Pliocene warm period MIS M2 stable isotope geochemistry |
description |
The mid-Pliocene (3.3-3.0 million years ago) is an important possible analogue to future, warmer-than-present climates. This interval is the most recent period in Earth's history of sustained global warmth, when atmospheric CO2 concentrations were comparable to the early 21th century, global ice volume was reduced and sea-levels were significantly higher than at present. Relatively few deep ocean temperature records exist from this time interval, but some available data suggest that large differences in temperatures existed between different deep ocean basins. This is in contrast to the modern ocean, which is relatively isothermal across the various basins at similar depth. In order to verify the possibility of a large temperature gradient between the deep Pacific and deep North Atlantic oceans, we generated new benthic foraminiferal carbonate clumped isotope (Δ47) and Mg/Ca bottom water temperatures from Pacific ODP Site 849 and North Atlantic IODP Site U1308. We find that the deep North Atlantic was significantly warmer (by 4°C) and likely more saline than the deep Pacific throughout our study interval, suggesting inefficient heat and salt transport from the Atlantic into the deep Pacific at this time. Our records also cover the enigmatic Marine Isotope Stage (MIS) M2 glacial event at 3.3 Ma, which represents the largest positive oxygen isotope excursion of the Pliocene prior to the intensification of Northern Hemisphere glaation.This event has been cited as a possible failed attempt at establishing Northern Hemisphere glacial-interglacial cycles. The amplitute of cooling observed in our temperature records suggest that much of the observed change in benthic δ18O can be attributed to cooling of the deep ocean rather than a substantial growth of ice on land. This data set contains final calculated bottom water temperatures from Δ47 from both study sites; Mg/Ca, Mn/Ca and Fe/Ca ratios and calculated Mg/Ca bottom water temperatures from both study sites and new stable isotope data from Site U1308. |
format |
Dataset |
author |
Braaten, Anna Hauge Jakob, Kim A Ho, Sze Ling Friedrich, Oliver Galaasen, Eirik Vinje De Schepper, Stijn Wilson, Paul A Meckler, Anna Nele |
author_facet |
Braaten, Anna Hauge Jakob, Kim A Ho, Sze Ling Friedrich, Oliver Galaasen, Eirik Vinje De Schepper, Stijn Wilson, Paul A Meckler, Anna Nele |
author_sort |
Braaten, Anna Hauge |
title |
Mid-Pliocene Mg/Ca and clumped isotope bottom water temperatures from ODP Site 138-849 and IODP Site 303-U1308 |
title_short |
Mid-Pliocene Mg/Ca and clumped isotope bottom water temperatures from ODP Site 138-849 and IODP Site 303-U1308 |
title_full |
Mid-Pliocene Mg/Ca and clumped isotope bottom water temperatures from ODP Site 138-849 and IODP Site 303-U1308 |
title_fullStr |
Mid-Pliocene Mg/Ca and clumped isotope bottom water temperatures from ODP Site 138-849 and IODP Site 303-U1308 |
title_full_unstemmed |
Mid-Pliocene Mg/Ca and clumped isotope bottom water temperatures from ODP Site 138-849 and IODP Site 303-U1308 |
title_sort |
mid-pliocene mg/ca and clumped isotope bottom water temperatures from odp site 138-849 and iodp site 303-u1308 |
publisher |
PANGAEA |
url |
https://doi.pangaea.de/10.1594/PANGAEA.960832 |
op_coverage |
MEDIAN LATITUDE: 25.030545 * MEDIAN LONGITUDE: -67.378220 * SOUTH-BOUND LATITUDE: 0.183330 * WEST-BOUND LONGITUDE: -110.518330 * NORTH-BOUND LATITUDE: 49.877760 * EAST-BOUND LONGITUDE: -24.238110 * DATE/TIME START: 1991-06-12T00:00:00 * DATE/TIME END: 2004-10-30T00:00:00 |
long_lat |
ENVELOPE(-110.518330,-24.238110,49.877760,0.183330) |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Braaten, Anna Hauge; Jakob, Kim A; Ho, Sze Ling; Friedrich, Oliver; Galaasen, Eirik Vinje; De Schepper, Stijn; Wilson, Paul A; Meckler, Anna Nele (in prep.): Limited exchange between the deep Pacific and Atlantic oceans during the warm mid-Pliocene and MIS M2 "glaciation". https://doi.pangaea.de/10.1594/PANGAEA.960832 |
op_rights |
Access constraints: access rights needed info:eu-repo/semantics/restrictedAccess |
_version_ |
1772817155634495488 |