Changes in bottom water corrosiveness and carbonate ion concentrations in the sub-Antarctic Atlantic during the last glacial period
The glacial climate system transitioned rapidly between cold (stadial) and warm (interstadial) conditions in the Northern Hemisphere. This variability, referred to as Dansgaard-Oeschger variability, is widely believed to arise from perturbations of the Atlantic Meridional Overturning Circulation. Ev...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.841244 2024-09-15T17:43:16+00:00 Changes in bottom water corrosiveness and carbonate ion concentrations in the sub-Antarctic Atlantic during the last glacial period Gottschalk, Julia Skinner, Luke C Misra, Sambuddha Waelbroeck, Claire Menviel, Laurie Timmermann, Axel LATITUDE: -44.153330 * LONGITUDE: -14.228170 2015 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.841244 https://doi.org/10.1594/PANGAEA.841244 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.841244 https://doi.org/10.1594/PANGAEA.841244 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Gottschalk, Julia; Skinner, Luke C; Misra, Sambuddha; Waelbroeck, Claire; Menviel, Laurie; Timmermann, Axel (2015): Abrupt changes in the southern extent of North Atlantic Deep Water during Dansgaard–Oeschger events. Nature Geoscience, 8(12), 950-954, https://doi.org/10.1038/ngeo2558 Calypso Square Core System CASQS IMAGES XV - Pachiderme Marion Dufresne (1995) MD07-3076 MD07-3076Q MD159 dataset publication series 2015 ftpangaea https://doi.org/10.1594/PANGAEA.84124410.1038/ngeo2558 2024-07-24T02:31:21Z The glacial climate system transitioned rapidly between cold (stadial) and warm (interstadial) conditions in the Northern Hemisphere. This variability, referred to as Dansgaard-Oeschger variability, is widely believed to arise from perturbations of the Atlantic Meridional Overturning Circulation. Evidence for such changes during the longer Heinrich stadials has been identified, but direct evidence for overturning circulation changes during Dansgaard-Oeschger events has proven elusive. Here we reconstruct bottom water [CO3]2- variability from B/Ca ratios of benthic foraminifera and indicators of sedimentary dissolution, and use these reconstructions to infer the flow of northern-sourced deep water to the deep central sub-Antarctic Atlantic Ocean. We find that nearly every Dansgaard-Oeschger interstadial is accompanied by a rapid incursion of North Atlantic Deep Water into the deep South Atlantic. Based on these results and transient climate model simulations, we conclude that North Atlantic stadial-interstadial climate variability was associated with significant Atlantic overturning circulation changes that were rapidly transmitted across the Atlantic. However, by demonstrating the persistent role of Atlantic overturning circulation changes in past abrupt climate variability, our reconstructions of carbonate chemistry further indicate that the carbon cycle response to abrupt climate change was not a simple function of North Atlantic overturning. Other/Unknown Material Antarc* Antarctic Dansgaard-Oeschger events North Atlantic Deep Water North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-14.228170,-14.228170,-44.153330,-44.153330) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Calypso Square Core System CASQS IMAGES XV - Pachiderme Marion Dufresne (1995) MD07-3076 MD07-3076Q MD159 |
spellingShingle |
Calypso Square Core System CASQS IMAGES XV - Pachiderme Marion Dufresne (1995) MD07-3076 MD07-3076Q MD159 Gottschalk, Julia Skinner, Luke C Misra, Sambuddha Waelbroeck, Claire Menviel, Laurie Timmermann, Axel Changes in bottom water corrosiveness and carbonate ion concentrations in the sub-Antarctic Atlantic during the last glacial period |
topic_facet |
Calypso Square Core System CASQS IMAGES XV - Pachiderme Marion Dufresne (1995) MD07-3076 MD07-3076Q MD159 |
description |
The glacial climate system transitioned rapidly between cold (stadial) and warm (interstadial) conditions in the Northern Hemisphere. This variability, referred to as Dansgaard-Oeschger variability, is widely believed to arise from perturbations of the Atlantic Meridional Overturning Circulation. Evidence for such changes during the longer Heinrich stadials has been identified, but direct evidence for overturning circulation changes during Dansgaard-Oeschger events has proven elusive. Here we reconstruct bottom water [CO3]2- variability from B/Ca ratios of benthic foraminifera and indicators of sedimentary dissolution, and use these reconstructions to infer the flow of northern-sourced deep water to the deep central sub-Antarctic Atlantic Ocean. We find that nearly every Dansgaard-Oeschger interstadial is accompanied by a rapid incursion of North Atlantic Deep Water into the deep South Atlantic. Based on these results and transient climate model simulations, we conclude that North Atlantic stadial-interstadial climate variability was associated with significant Atlantic overturning circulation changes that were rapidly transmitted across the Atlantic. However, by demonstrating the persistent role of Atlantic overturning circulation changes in past abrupt climate variability, our reconstructions of carbonate chemistry further indicate that the carbon cycle response to abrupt climate change was not a simple function of North Atlantic overturning. |
format |
Other/Unknown Material |
author |
Gottschalk, Julia Skinner, Luke C Misra, Sambuddha Waelbroeck, Claire Menviel, Laurie Timmermann, Axel |
author_facet |
Gottschalk, Julia Skinner, Luke C Misra, Sambuddha Waelbroeck, Claire Menviel, Laurie Timmermann, Axel |
author_sort |
Gottschalk, Julia |
title |
Changes in bottom water corrosiveness and carbonate ion concentrations in the sub-Antarctic Atlantic during the last glacial period |
title_short |
Changes in bottom water corrosiveness and carbonate ion concentrations in the sub-Antarctic Atlantic during the last glacial period |
title_full |
Changes in bottom water corrosiveness and carbonate ion concentrations in the sub-Antarctic Atlantic during the last glacial period |
title_fullStr |
Changes in bottom water corrosiveness and carbonate ion concentrations in the sub-Antarctic Atlantic during the last glacial period |
title_full_unstemmed |
Changes in bottom water corrosiveness and carbonate ion concentrations in the sub-Antarctic Atlantic during the last glacial period |
title_sort |
changes in bottom water corrosiveness and carbonate ion concentrations in the sub-antarctic atlantic during the last glacial period |
publisher |
PANGAEA |
publishDate |
2015 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.841244 https://doi.org/10.1594/PANGAEA.841244 |
op_coverage |
LATITUDE: -44.153330 * LONGITUDE: -14.228170 |
long_lat |
ENVELOPE(-14.228170,-14.228170,-44.153330,-44.153330) |
genre |
Antarc* Antarctic Dansgaard-Oeschger events North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic Dansgaard-Oeschger events North Atlantic Deep Water North Atlantic |
op_source |
Supplement to: Gottschalk, Julia; Skinner, Luke C; Misra, Sambuddha; Waelbroeck, Claire; Menviel, Laurie; Timmermann, Axel (2015): Abrupt changes in the southern extent of North Atlantic Deep Water during Dansgaard–Oeschger events. Nature Geoscience, 8(12), 950-954, https://doi.org/10.1038/ngeo2558 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.841244 https://doi.org/10.1594/PANGAEA.841244 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.84124410.1038/ngeo2558 |
_version_ |
1810490136686755840 |