(Table 1) Age comparison between the GPTS and ODP Site 181-1123 age model for each chron base within the Middle Miocene section
Today the deep western boundary current (DWBC) east of New Zealand is the most important route for deep water entering the Pacific Ocean. Large-scale changes in deep water circulation patterns are thought to have been associated with the development of the East Antarctic Ice Sheet (EAIS) close to th...
Main Authors: | , , , , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2003
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.841718 https://doi.org/10.1594/PANGAEA.841718 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.841718 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.841718 2023-05-15T14:03:04+02:00 (Table 1) Age comparison between the GPTS and ODP Site 181-1123 age model for each chron base within the Middle Miocene section Hall, Ian R McCave, I Nick Zahn, Rainer Carter, Lionel Knutz, Paul Cornils Weedon, Graham P LATITUDE: -41.786000 * LONGITUDE: -171.498980 * DATE/TIME START: 1998-09-14T23:55:00 * DATE/TIME END: 1998-09-19T09:55:00 * MINIMUM DEPTH, sediment/rock: 416.10 m * MAXIMUM DEPTH, sediment/rock: 470.29 m 2003-01-21 text/tab-separated-values, 96 data points https://doi.pangaea.de/10.1594/PANGAEA.841718 https://doi.org/10.1594/PANGAEA.841718 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.841718 https://doi.org/10.1594/PANGAEA.841718 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Hall, Ian R; McCave, I Nick; Zahn, Rainer; Carter, Lionel; Knutz, Paul Cornils; Weedon, Graham P (2003): Paleocurrent reconstruction of the deep Pacific inflow during the middle Miocene: Reflections of East Antarctic Ice Sheet growth. Paleoceanography, 18(2), 1040, https://doi.org/10.1029/2002PA000817 181-1123B Age difference Age model Berggren et al (1995) BKSA95 optional Chronozone Depth composite revised sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Joides Resolution Leg181 Ocean Drilling Program ODP Sample code/label South Pacific Ocean Dataset 2003 ftpangaea https://doi.org/10.1594/PANGAEA.841718 https://doi.org/10.1029/2002PA000817 2023-01-20T09:05:06Z Today the deep western boundary current (DWBC) east of New Zealand is the most important route for deep water entering the Pacific Ocean. Large-scale changes in deep water circulation patterns are thought to have been associated with the development of the East Antarctic Ice Sheet (EAIS) close to the main source of bottom water for the DWBC. Here we reconstruct the changing speed of the southwest Pacific DWBC during the middle Miocene from ~15.5-12.5 Ma, a period of significant global ice accumulation associated with EAIS growth. Sortable silt mean grain sizes from Ocean Drilling Program Site 1123 reveal variability in the speed of the Pacific inflow on the timescale of the 41 kyr orbital obliquity cycle. Similar orbital period flow changes have recently been demonstrated for the Pleistocene epoch. Collectively, these observations suggest that a strong coupling between changes in the speed of the deep Pacific inflow and high-latitude climate forcing may have been a persistent feature of the global thermohaline circulation system for at least the past 15 Myr. Furthermore, long-term changes in flow speed suggest an intensification of the DWBC under an inferred increase in Southern Component Water production. This occurred at the same time as decreasing Tethyan outflow and major EAIS growth between ~15.5 and 13.5 Ma. These results provide evidence that a major component of the deep thermohaline circulation was associated with the middle Miocene growth of the EAIS and support the view that this time interval represents an important step in the development of the Neogene icehouse climate. Dataset Antarc* Antarctic Ice Sheet PANGAEA - Data Publisher for Earth & Environmental Science Antarctic East Antarctic Ice Sheet New Zealand Pacific ENVELOPE(-171.498980,-171.498980,-41.786000,-41.786000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
181-1123B Age difference Age model Berggren et al (1995) BKSA95 optional Chronozone Depth composite revised sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Joides Resolution Leg181 Ocean Drilling Program ODP Sample code/label South Pacific Ocean |
spellingShingle |
181-1123B Age difference Age model Berggren et al (1995) BKSA95 optional Chronozone Depth composite revised sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Joides Resolution Leg181 Ocean Drilling Program ODP Sample code/label South Pacific Ocean Hall, Ian R McCave, I Nick Zahn, Rainer Carter, Lionel Knutz, Paul Cornils Weedon, Graham P (Table 1) Age comparison between the GPTS and ODP Site 181-1123 age model for each chron base within the Middle Miocene section |
topic_facet |
181-1123B Age difference Age model Berggren et al (1995) BKSA95 optional Chronozone Depth composite revised sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Joides Resolution Leg181 Ocean Drilling Program ODP Sample code/label South Pacific Ocean |
description |
Today the deep western boundary current (DWBC) east of New Zealand is the most important route for deep water entering the Pacific Ocean. Large-scale changes in deep water circulation patterns are thought to have been associated with the development of the East Antarctic Ice Sheet (EAIS) close to the main source of bottom water for the DWBC. Here we reconstruct the changing speed of the southwest Pacific DWBC during the middle Miocene from ~15.5-12.5 Ma, a period of significant global ice accumulation associated with EAIS growth. Sortable silt mean grain sizes from Ocean Drilling Program Site 1123 reveal variability in the speed of the Pacific inflow on the timescale of the 41 kyr orbital obliquity cycle. Similar orbital period flow changes have recently been demonstrated for the Pleistocene epoch. Collectively, these observations suggest that a strong coupling between changes in the speed of the deep Pacific inflow and high-latitude climate forcing may have been a persistent feature of the global thermohaline circulation system for at least the past 15 Myr. Furthermore, long-term changes in flow speed suggest an intensification of the DWBC under an inferred increase in Southern Component Water production. This occurred at the same time as decreasing Tethyan outflow and major EAIS growth between ~15.5 and 13.5 Ma. These results provide evidence that a major component of the deep thermohaline circulation was associated with the middle Miocene growth of the EAIS and support the view that this time interval represents an important step in the development of the Neogene icehouse climate. |
format |
Dataset |
author |
Hall, Ian R McCave, I Nick Zahn, Rainer Carter, Lionel Knutz, Paul Cornils Weedon, Graham P |
author_facet |
Hall, Ian R McCave, I Nick Zahn, Rainer Carter, Lionel Knutz, Paul Cornils Weedon, Graham P |
author_sort |
Hall, Ian R |
title |
(Table 1) Age comparison between the GPTS and ODP Site 181-1123 age model for each chron base within the Middle Miocene section |
title_short |
(Table 1) Age comparison between the GPTS and ODP Site 181-1123 age model for each chron base within the Middle Miocene section |
title_full |
(Table 1) Age comparison between the GPTS and ODP Site 181-1123 age model for each chron base within the Middle Miocene section |
title_fullStr |
(Table 1) Age comparison between the GPTS and ODP Site 181-1123 age model for each chron base within the Middle Miocene section |
title_full_unstemmed |
(Table 1) Age comparison between the GPTS and ODP Site 181-1123 age model for each chron base within the Middle Miocene section |
title_sort |
(table 1) age comparison between the gpts and odp site 181-1123 age model for each chron base within the middle miocene section |
publisher |
PANGAEA |
publishDate |
2003 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.841718 https://doi.org/10.1594/PANGAEA.841718 |
op_coverage |
LATITUDE: -41.786000 * LONGITUDE: -171.498980 * DATE/TIME START: 1998-09-14T23:55:00 * DATE/TIME END: 1998-09-19T09:55:00 * MINIMUM DEPTH, sediment/rock: 416.10 m * MAXIMUM DEPTH, sediment/rock: 470.29 m |
long_lat |
ENVELOPE(-171.498980,-171.498980,-41.786000,-41.786000) |
geographic |
Antarctic East Antarctic Ice Sheet New Zealand Pacific |
geographic_facet |
Antarctic East Antarctic Ice Sheet New Zealand Pacific |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Supplement to: Hall, Ian R; McCave, I Nick; Zahn, Rainer; Carter, Lionel; Knutz, Paul Cornils; Weedon, Graham P (2003): Paleocurrent reconstruction of the deep Pacific inflow during the middle Miocene: Reflections of East Antarctic Ice Sheet growth. Paleoceanography, 18(2), 1040, https://doi.org/10.1029/2002PA000817 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.841718 https://doi.org/10.1594/PANGAEA.841718 |
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.841718 https://doi.org/10.1029/2002PA000817 |
_version_ |
1766273564461236224 |