(Table 3) Age determination of sediment cores from the SW Pacific Ocean
Eight- to ten-point depth profiles (from 1200 to 4800 m water depth) of oxygen and carbon isotopic values derived from benthic foraminifera, averaged over selected times in the past 160 ka, are presented. The data are from 10 sediment cores off eastern New Zealand, mainly North Chatham Rise. This li...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.817599 2023-05-15T13:49:51+02:00 (Table 3) Age determination of sediment cores from the SW Pacific Ocean McCave, I Nick Carter, Larry S Hall, Ian R MEDIAN LATITUDE: -41.335387 * MEDIAN LONGITUDE: -176.667833 * SOUTH-BOUND LATITUDE: -42.390000 * WEST-BOUND LONGITUDE: 179.996500 * NORTH-BOUND LATITUDE: -40.032830 * EAST-BOUND LONGITUDE: -171.500000 * MINIMUM DEPTH, sediment/rock: 0.0050 m * MAXIMUM DEPTH, sediment/rock: 0.8600 m 2008-08-05 text/tab-separated-values, 47 data points https://doi.pangaea.de/10.1594/PANGAEA.817599 https://doi.org/10.1594/PANGAEA.817599 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.817599 https://doi.org/10.1594/PANGAEA.817599 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: McCave, I Nick; Carter, Lionel; Hall, Ian R (2008): Glacial–interglacial changes in water mass structure and flow in the SW Pacific Ocean. Quaternary Science Reviews, 27(19-20), 1886-1908, https://doi.org/10.1016/j.quascirev.2008.07.010 Age 14C AMS comment dated dated standard deviation difference BC Box corer CHAT_10k CHAT_16k CHAT_1k Depth bottom/max sediment/rock top/min Event label GC Gravity corer Sample comment Dataset 2008 ftpangaea https://doi.org/10.1594/PANGAEA.817599 https://doi.org/10.1016/j.quascirev.2008.07.010 2023-01-20T09:01:27Z Eight- to ten-point depth profiles (from 1200 to 4800 m water depth) of oxygen and carbon isotopic values derived from benthic foraminifera, averaged over selected times in the past 160 ka, are presented. The data are from 10 sediment cores off eastern New Zealand, mainly North Chatham Rise. This lies under the Deep Western Boundary Current in the Southwest Pacific and is the main point of entry for several water masses into the Pacific Ocean. The benthic isotopic profiles are related to the structure of water masses at present and inferred for the past. These have retained a constant structure of Lower Circumpolar Deep Water-Upper Circumpolar Deep Water/North Pacific Deep Water-Antarctic Intermediate Water with no apparent changes in the depths of water mass boundaries between glacial and interglacial states. Sortable silt particle size data for four cores are also examined to show that the vigour of the inflow to the Pacific, while variable, appears to have remained fairly constant on average. Among the lowest Last Glacial Maximum values of benthic d13C in the world ocean (-1.03 per mil based on Cibicidoides wüllerstorfi) occurs here at ~2200 m. Comparable values occur in the Atlantic sector of the Southern Ocean, while those from the rest of the Pacific are distinctly higher, confirming that the Southern Ocean was the source for the unventilated/nutrient-enriched water seen here. Oxygen and carbon isotopic data are compatible with a glacial cold deep water mass of high salinity, but lower nutrient content (or better ventilated), below ~3500 m depth. This contrasts with the South Atlantic where unventilated/nutrient-enriched water extends all the way to the sea bed. Comparison with previous studies also suggests that the deeper reaches of the Antarctic Circumpolar Current below ~3500 m are not homogeneous all around the Southern Ocean, with the Kerguelen Plateau and/or the Macquarie-Balleny Ridges posing barriers to the eastward spread of the deepest low-d13C water out of the South Atlantic in glacials. These ... Dataset Antarc* Antarctic Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Kerguelen New Zealand Pacific Southern Ocean The Antarctic ENVELOPE(179.996500,-171.500000,-40.032830,-42.390000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Age 14C AMS comment dated dated standard deviation difference BC Box corer CHAT_10k CHAT_16k CHAT_1k Depth bottom/max sediment/rock top/min Event label GC Gravity corer Sample comment |
spellingShingle |
Age 14C AMS comment dated dated standard deviation difference BC Box corer CHAT_10k CHAT_16k CHAT_1k Depth bottom/max sediment/rock top/min Event label GC Gravity corer Sample comment McCave, I Nick Carter, Larry S Hall, Ian R (Table 3) Age determination of sediment cores from the SW Pacific Ocean |
topic_facet |
Age 14C AMS comment dated dated standard deviation difference BC Box corer CHAT_10k CHAT_16k CHAT_1k Depth bottom/max sediment/rock top/min Event label GC Gravity corer Sample comment |
description |
Eight- to ten-point depth profiles (from 1200 to 4800 m water depth) of oxygen and carbon isotopic values derived from benthic foraminifera, averaged over selected times in the past 160 ka, are presented. The data are from 10 sediment cores off eastern New Zealand, mainly North Chatham Rise. This lies under the Deep Western Boundary Current in the Southwest Pacific and is the main point of entry for several water masses into the Pacific Ocean. The benthic isotopic profiles are related to the structure of water masses at present and inferred for the past. These have retained a constant structure of Lower Circumpolar Deep Water-Upper Circumpolar Deep Water/North Pacific Deep Water-Antarctic Intermediate Water with no apparent changes in the depths of water mass boundaries between glacial and interglacial states. Sortable silt particle size data for four cores are also examined to show that the vigour of the inflow to the Pacific, while variable, appears to have remained fairly constant on average. Among the lowest Last Glacial Maximum values of benthic d13C in the world ocean (-1.03 per mil based on Cibicidoides wüllerstorfi) occurs here at ~2200 m. Comparable values occur in the Atlantic sector of the Southern Ocean, while those from the rest of the Pacific are distinctly higher, confirming that the Southern Ocean was the source for the unventilated/nutrient-enriched water seen here. Oxygen and carbon isotopic data are compatible with a glacial cold deep water mass of high salinity, but lower nutrient content (or better ventilated), below ~3500 m depth. This contrasts with the South Atlantic where unventilated/nutrient-enriched water extends all the way to the sea bed. Comparison with previous studies also suggests that the deeper reaches of the Antarctic Circumpolar Current below ~3500 m are not homogeneous all around the Southern Ocean, with the Kerguelen Plateau and/or the Macquarie-Balleny Ridges posing barriers to the eastward spread of the deepest low-d13C water out of the South Atlantic in glacials. These ... |
format |
Dataset |
author |
McCave, I Nick Carter, Larry S Hall, Ian R |
author_facet |
McCave, I Nick Carter, Larry S Hall, Ian R |
author_sort |
McCave, I Nick |
title |
(Table 3) Age determination of sediment cores from the SW Pacific Ocean |
title_short |
(Table 3) Age determination of sediment cores from the SW Pacific Ocean |
title_full |
(Table 3) Age determination of sediment cores from the SW Pacific Ocean |
title_fullStr |
(Table 3) Age determination of sediment cores from the SW Pacific Ocean |
title_full_unstemmed |
(Table 3) Age determination of sediment cores from the SW Pacific Ocean |
title_sort |
(table 3) age determination of sediment cores from the sw pacific ocean |
publisher |
PANGAEA |
publishDate |
2008 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.817599 https://doi.org/10.1594/PANGAEA.817599 |
op_coverage |
MEDIAN LATITUDE: -41.335387 * MEDIAN LONGITUDE: -176.667833 * SOUTH-BOUND LATITUDE: -42.390000 * WEST-BOUND LONGITUDE: 179.996500 * NORTH-BOUND LATITUDE: -40.032830 * EAST-BOUND LONGITUDE: -171.500000 * MINIMUM DEPTH, sediment/rock: 0.0050 m * MAXIMUM DEPTH, sediment/rock: 0.8600 m |
long_lat |
ENVELOPE(179.996500,-171.500000,-40.032830,-42.390000) |
geographic |
Antarctic Kerguelen New Zealand Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Kerguelen New Zealand Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Supplement to: McCave, I Nick; Carter, Lionel; Hall, Ian R (2008): Glacial–interglacial changes in water mass structure and flow in the SW Pacific Ocean. Quaternary Science Reviews, 27(19-20), 1886-1908, https://doi.org/10.1016/j.quascirev.2008.07.010 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.817599 https://doi.org/10.1594/PANGAEA.817599 |
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.817599 https://doi.org/10.1016/j.quascirev.2008.07.010 |
_version_ |
1766252411916124160 |