Planktonic Mg/Ca and stable oxygen isotope ratios for DSDP Hole 90-590B
The transition from the early Pliocene "Warmhouse" towards the present "Icehouse" climate and the role of Gateway dynamics are intensively debated. Both, the constrictions of the Central American Seaway and the Indonesian Gateway affected ocean circulation and climate during the...
Main Authors: | , , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2011
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.786478 https://doi.org/10.1594/PANGAEA.786478 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.786478 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.786478 2023-05-15T13:42:10+02:00 Planktonic Mg/Ca and stable oxygen isotope ratios for DSDP Hole 90-590B Karas, Cyrus Nürnberg, Dirk Tiedemann, Ralf Garbe-Schönberg, Dieter LATITUDE: -31.167000 * LONGITUDE: 163.358500 * DATE/TIME START: 1982-12-15T00:00:00 * DATE/TIME END: 1982-12-15T00:00:00 2011-07-23 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.786478 https://doi.org/10.1594/PANGAEA.786478 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.786478 https://doi.org/10.1594/PANGAEA.786478 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Karas, Cyrus; Nürnberg, Dirk; Tiedemann, Ralf; Garbe-Schönberg, Dieter (2011): Pliocene climate change of the Southwest Pacific and the impact of ocean gateways. Earth and Planetary Science Letters, 301(1-2), 117-124, https://doi.org/10.1016/j.epsl.2010.10.028 90-590B Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg90 South Pacific/Tasman Sea/CONT RISE Dataset 2011 ftpangaea https://doi.org/10.1594/PANGAEA.786478 https://doi.org/10.1016/j.epsl.2010.10.028 2023-01-20T07:32:37Z The transition from the early Pliocene "Warmhouse" towards the present "Icehouse" climate and the role of Gateway dynamics are intensively debated. Both, the constrictions of the Central American Seaway and the Indonesian Gateway affected ocean circulation and climate during the Pliocene epoch. Here, we use combined d18O and Mg/Ca ratios of planktonic foraminifera (marine protozoa) from surface and subsurface levels to reconstruct the thermal structure and changes in salinities from the Southwest Pacific Deep Sea Drilling Project (DSDP) Site 590B from 6.5 to 2.5 Ma. Our data suggest a gradual cooling of ~2 °C and freshening of the sea surface during ~4.6-4 Ma with an increased meridional temperature gradient between the West Pacific Warm Pool and the Southwest Pacific when the closing of the Central American Seaway reached a critical threshold. After ~ 3.5 Ma, the restricted Indonesian Gateway might have amplified the East Australian Current, allowing enhanced heat transport towards the Southwest Pacific with reduced meridional temperature gradients when the global climate gradually cooled. At the same time our data suggest a cooling and freshening of Subantarctic Mode Water (SAMW) or/and an increased northward flow of SAMW towards Site 590B, possibly a first step towards the present Antarctic Frontal System. Dataset Antarc* Antarctic Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Pacific ENVELOPE(163.358500,163.358500,-31.167000,-31.167000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
90-590B Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg90 South Pacific/Tasman Sea/CONT RISE |
spellingShingle |
90-590B Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg90 South Pacific/Tasman Sea/CONT RISE Karas, Cyrus Nürnberg, Dirk Tiedemann, Ralf Garbe-Schönberg, Dieter Planktonic Mg/Ca and stable oxygen isotope ratios for DSDP Hole 90-590B |
topic_facet |
90-590B Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg90 South Pacific/Tasman Sea/CONT RISE |
description |
The transition from the early Pliocene "Warmhouse" towards the present "Icehouse" climate and the role of Gateway dynamics are intensively debated. Both, the constrictions of the Central American Seaway and the Indonesian Gateway affected ocean circulation and climate during the Pliocene epoch. Here, we use combined d18O and Mg/Ca ratios of planktonic foraminifera (marine protozoa) from surface and subsurface levels to reconstruct the thermal structure and changes in salinities from the Southwest Pacific Deep Sea Drilling Project (DSDP) Site 590B from 6.5 to 2.5 Ma. Our data suggest a gradual cooling of ~2 °C and freshening of the sea surface during ~4.6-4 Ma with an increased meridional temperature gradient between the West Pacific Warm Pool and the Southwest Pacific when the closing of the Central American Seaway reached a critical threshold. After ~ 3.5 Ma, the restricted Indonesian Gateway might have amplified the East Australian Current, allowing enhanced heat transport towards the Southwest Pacific with reduced meridional temperature gradients when the global climate gradually cooled. At the same time our data suggest a cooling and freshening of Subantarctic Mode Water (SAMW) or/and an increased northward flow of SAMW towards Site 590B, possibly a first step towards the present Antarctic Frontal System. |
format |
Dataset |
author |
Karas, Cyrus Nürnberg, Dirk Tiedemann, Ralf Garbe-Schönberg, Dieter |
author_facet |
Karas, Cyrus Nürnberg, Dirk Tiedemann, Ralf Garbe-Schönberg, Dieter |
author_sort |
Karas, Cyrus |
title |
Planktonic Mg/Ca and stable oxygen isotope ratios for DSDP Hole 90-590B |
title_short |
Planktonic Mg/Ca and stable oxygen isotope ratios for DSDP Hole 90-590B |
title_full |
Planktonic Mg/Ca and stable oxygen isotope ratios for DSDP Hole 90-590B |
title_fullStr |
Planktonic Mg/Ca and stable oxygen isotope ratios for DSDP Hole 90-590B |
title_full_unstemmed |
Planktonic Mg/Ca and stable oxygen isotope ratios for DSDP Hole 90-590B |
title_sort |
planktonic mg/ca and stable oxygen isotope ratios for dsdp hole 90-590b |
publisher |
PANGAEA |
publishDate |
2011 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.786478 https://doi.org/10.1594/PANGAEA.786478 |
op_coverage |
LATITUDE: -31.167000 * LONGITUDE: 163.358500 * DATE/TIME START: 1982-12-15T00:00:00 * DATE/TIME END: 1982-12-15T00:00:00 |
long_lat |
ENVELOPE(163.358500,163.358500,-31.167000,-31.167000) |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic Planktonic foraminifera |
genre_facet |
Antarc* Antarctic Planktonic foraminifera |
op_source |
Supplement to: Karas, Cyrus; Nürnberg, Dirk; Tiedemann, Ralf; Garbe-Schönberg, Dieter (2011): Pliocene climate change of the Southwest Pacific and the impact of ocean gateways. Earth and Planetary Science Letters, 301(1-2), 117-124, https://doi.org/10.1016/j.epsl.2010.10.028 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.786478 https://doi.org/10.1594/PANGAEA.786478 |
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.786478 https://doi.org/10.1016/j.epsl.2010.10.028 |
_version_ |
1766164287784484864 |