(Table 1) Age determination of sediment cores CH115-12PG-PC and GeoB1711-4
Planktonic foraminifera recovered from two cores in the northern Benguela upwelling system reveal a history of rapid events with a variability at sub-Milankovitch frequencies during the last 140 kyr. The "cold-water" planktonic foraminifer, left coiling Neogloboquadrina pachyderma (Ehrenbe...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.868915 2023-05-15T16:30:32+02:00 (Table 1) Age determination of sediment cores CH115-12PG-PC and GeoB1711-4 Little, Mark G Schneider, Ralph R Kroon, Dick Price, B Summerhayes, Colin P Segl, Monika MEDIAN LATITUDE: -22.791000 * MEDIAN LONGITUDE: 12.457333 * SOUTH-BOUND LATITUDE: -23.315000 * WEST-BOUND LONGITUDE: 12.376667 * NORTH-BOUND LATITUDE: -22.267000 * EAST-BOUND LONGITUDE: 12.538000 * DATE/TIME START: 1992-01-11T00:00:00 * DATE/TIME END: 1992-01-11T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.10 m * MAXIMUM DEPTH, sediment/rock: 3.41 m 1997-01-29 text/tab-separated-values, 64 data points https://doi.pangaea.de/10.1594/PANGAEA.868915 https://doi.org/10.1594/PANGAEA.868915 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.868915 https://doi.org/10.1594/PANGAEA.868915 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Little, Mark G; Schneider, Ralph R; Kroon, Dick; Price, B; Summerhayes, Colin P; Segl, Monika (1997): Trade wind forcing of upwelling, seasonality, and Heinrich Events as a response to sub-Milankovitch climate variability. Paleoceanography, 12(4), 568-576, https://doi.org/10.1029/97PA00823 Age 14C AMS 14C milieu/reservoir corrected (-400 yr) dated dated material dated standard error Calendar age standard error CH115 CH115-12PG-PC Chain Chain115 COMPCORE Composite Core DEPTH sediment/rock Event label GeoB1711 GeoB1711-4 Gravity corer (Kiel type) Laboratory code/label M20/2 Meteor (1986) Namibia continental slope SL Walvis Ridge Southeast Atlantic Ocean Dataset 1997 ftpangaea https://doi.org/10.1594/PANGAEA.868915 https://doi.org/10.1029/97PA00823 2023-01-20T09:08:15Z Planktonic foraminifera recovered from two cores in the northern Benguela upwelling system reveal a history of rapid events with a variability at sub-Milankovitch frequencies during the last 140 kyr. The "cold-water" planktonic foraminifer, left coiling Neogloboquadrina pachyderma (Ehrenberg), shows rapid fluctuations in relative abundance, indicating changes in upwelling intensity. The periods of high abundance in left coiling N. pachyderma are referred to as "PS events" (pachyderma sinistral) and indicate increased intensity and zonality of the South Atlantic trade winds controlling the Benguela upwelling system. The good correlation between PS events, the North Atlantic Heinrich events, and the Dansgaard-Oeschger cycles from the Greenland Ice Sheet Program (GISP2) ice core suggests large-scale global oceanographic or climatic teleconnections between the South and North Atlantic via the trade wind system. The radiocarbon constrained timing of PS events younger than 45 kyr indicates that the South Atlantic leads the North Atlantic's response to trade wind changes, particularly during isotope stages 4-2 when the Earth was dominated by large ice sheets. At times of increased trade wind strength, tropical and subtropical waters are forced across the equator enhancing the pool of warm water to be transferred to the high latitudes of the North Atlantic via the Gulf Stream and North Atlantic Drift, increasing the pull of the thermohaline convective conveyor. The increased supply of warm water to the polar regions of the northern hemisphere increases the ice-ocean moisture gradient and accelerates ice sheet growth, leading to eventual instability and collapse. Dataset Greenland ice core Ice Sheet Neogloboquadrina pachyderma North Atlantic Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science Greenland ENVELOPE(12.376667,12.538000,-22.267000,-23.315000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Age 14C AMS 14C milieu/reservoir corrected (-400 yr) dated dated material dated standard error Calendar age standard error CH115 CH115-12PG-PC Chain Chain115 COMPCORE Composite Core DEPTH sediment/rock Event label GeoB1711 GeoB1711-4 Gravity corer (Kiel type) Laboratory code/label M20/2 Meteor (1986) Namibia continental slope SL Walvis Ridge Southeast Atlantic Ocean |
spellingShingle |
Age 14C AMS 14C milieu/reservoir corrected (-400 yr) dated dated material dated standard error Calendar age standard error CH115 CH115-12PG-PC Chain Chain115 COMPCORE Composite Core DEPTH sediment/rock Event label GeoB1711 GeoB1711-4 Gravity corer (Kiel type) Laboratory code/label M20/2 Meteor (1986) Namibia continental slope SL Walvis Ridge Southeast Atlantic Ocean Little, Mark G Schneider, Ralph R Kroon, Dick Price, B Summerhayes, Colin P Segl, Monika (Table 1) Age determination of sediment cores CH115-12PG-PC and GeoB1711-4 |
topic_facet |
Age 14C AMS 14C milieu/reservoir corrected (-400 yr) dated dated material dated standard error Calendar age standard error CH115 CH115-12PG-PC Chain Chain115 COMPCORE Composite Core DEPTH sediment/rock Event label GeoB1711 GeoB1711-4 Gravity corer (Kiel type) Laboratory code/label M20/2 Meteor (1986) Namibia continental slope SL Walvis Ridge Southeast Atlantic Ocean |
description |
Planktonic foraminifera recovered from two cores in the northern Benguela upwelling system reveal a history of rapid events with a variability at sub-Milankovitch frequencies during the last 140 kyr. The "cold-water" planktonic foraminifer, left coiling Neogloboquadrina pachyderma (Ehrenberg), shows rapid fluctuations in relative abundance, indicating changes in upwelling intensity. The periods of high abundance in left coiling N. pachyderma are referred to as "PS events" (pachyderma sinistral) and indicate increased intensity and zonality of the South Atlantic trade winds controlling the Benguela upwelling system. The good correlation between PS events, the North Atlantic Heinrich events, and the Dansgaard-Oeschger cycles from the Greenland Ice Sheet Program (GISP2) ice core suggests large-scale global oceanographic or climatic teleconnections between the South and North Atlantic via the trade wind system. The radiocarbon constrained timing of PS events younger than 45 kyr indicates that the South Atlantic leads the North Atlantic's response to trade wind changes, particularly during isotope stages 4-2 when the Earth was dominated by large ice sheets. At times of increased trade wind strength, tropical and subtropical waters are forced across the equator enhancing the pool of warm water to be transferred to the high latitudes of the North Atlantic via the Gulf Stream and North Atlantic Drift, increasing the pull of the thermohaline convective conveyor. The increased supply of warm water to the polar regions of the northern hemisphere increases the ice-ocean moisture gradient and accelerates ice sheet growth, leading to eventual instability and collapse. |
format |
Dataset |
author |
Little, Mark G Schneider, Ralph R Kroon, Dick Price, B Summerhayes, Colin P Segl, Monika |
author_facet |
Little, Mark G Schneider, Ralph R Kroon, Dick Price, B Summerhayes, Colin P Segl, Monika |
author_sort |
Little, Mark G |
title |
(Table 1) Age determination of sediment cores CH115-12PG-PC and GeoB1711-4 |
title_short |
(Table 1) Age determination of sediment cores CH115-12PG-PC and GeoB1711-4 |
title_full |
(Table 1) Age determination of sediment cores CH115-12PG-PC and GeoB1711-4 |
title_fullStr |
(Table 1) Age determination of sediment cores CH115-12PG-PC and GeoB1711-4 |
title_full_unstemmed |
(Table 1) Age determination of sediment cores CH115-12PG-PC and GeoB1711-4 |
title_sort |
(table 1) age determination of sediment cores ch115-12pg-pc and geob1711-4 |
publisher |
PANGAEA |
publishDate |
1997 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.868915 https://doi.org/10.1594/PANGAEA.868915 |
op_coverage |
MEDIAN LATITUDE: -22.791000 * MEDIAN LONGITUDE: 12.457333 * SOUTH-BOUND LATITUDE: -23.315000 * WEST-BOUND LONGITUDE: 12.376667 * NORTH-BOUND LATITUDE: -22.267000 * EAST-BOUND LONGITUDE: 12.538000 * DATE/TIME START: 1992-01-11T00:00:00 * DATE/TIME END: 1992-01-11T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.10 m * MAXIMUM DEPTH, sediment/rock: 3.41 m |
long_lat |
ENVELOPE(12.376667,12.538000,-22.267000,-23.315000) |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core Ice Sheet Neogloboquadrina pachyderma North Atlantic Planktonic foraminifera |
genre_facet |
Greenland ice core Ice Sheet Neogloboquadrina pachyderma North Atlantic Planktonic foraminifera |
op_source |
Supplement to: Little, Mark G; Schneider, Ralph R; Kroon, Dick; Price, B; Summerhayes, Colin P; Segl, Monika (1997): Trade wind forcing of upwelling, seasonality, and Heinrich Events as a response to sub-Milankovitch climate variability. Paleoceanography, 12(4), 568-576, https://doi.org/10.1029/97PA00823 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.868915 https://doi.org/10.1594/PANGAEA.868915 |
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.868915 https://doi.org/10.1029/97PA00823 |
_version_ |
1766020257657389056 |