Evolution of South Atlantic density and chemical stratification across the last deglaciation
Explanations of the glacial-interglacial variations in atmospheric pCO(2) invoke a significant role for the deep ocean in the storage of CO2. Deep-ocean density stratification has been proposed as a mechanism to promote the storage of CO2 in the deep ocean during glacial times. A wealth of proxy dat...
Published in: | Proceedings of the National Academy of Sciences |
---|---|
Main Authors: | , , , , , , , , |
Format: | Text |
Language: | English |
Published: |
Natl Acad Sciences
|
Subjects: | |
Online Access: | https://doi.org/10.1073/pnas.1511252113 https://archimer.ifremer.fr/doc/00421/53276/54569.pdf https://archimer.ifremer.fr/doc/00421/53276/54570.pdf https://archimer.ifremer.fr/doc/00421/53276/ |
id |
fttriple:oai:gotriple.eu:10670/1.bohsxz |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:10670/1.bohsxz 2023-05-15T13:54:58+02:00 Evolution of South Atlantic density and chemical stratification across the last deglaciation Roberts, Jenny Gottschalk, Julia Skinner, Luke C. Peck, Victoria L. Kender, Sev Elderfield, Henry Waelbroeck, Claire Riveiros, Natalia Vazquez Hodell, David A. https://doi.org/10.1073/pnas.1511252113 https://archimer.ifremer.fr/doc/00421/53276/54569.pdf https://archimer.ifremer.fr/doc/00421/53276/54570.pdf https://archimer.ifremer.fr/doc/00421/53276/ en eng Natl Acad Sciences doi:10.1073/pnas.1511252113 10670/1.bohsxz https://archimer.ifremer.fr/doc/00421/53276/54569.pdf https://archimer.ifremer.fr/doc/00421/53276/54570.pdf https://archimer.ifremer.fr/doc/00421/53276/ other Archimer, archive institutionnelle de l'Ifremer Proceedings Of The National Academy Of Sciences Of The United States Of America (0027-8424) (Natl Acad Sciences), 2016-01 , Vol. 113 , N. 3 , P. 514-519 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1073/pnas.1511252113 2023-01-22T18:02:54Z Explanations of the glacial-interglacial variations in atmospheric pCO(2) invoke a significant role for the deep ocean in the storage of CO2. Deep-ocean density stratification has been proposed as a mechanism to promote the storage of CO2 in the deep ocean during glacial times. A wealth of proxy data supports the presence of a "chemical divide" between intermediate and deep water in the glacial Atlantic Ocean, which indirectly points to an increase in deep-ocean density stratification. However, direct observational evidence of changes in the primary controls of ocean density stratification, i.e., temperature and salinity, remain scarce. Here, we use Mg/Ca-derived seawater temperature and salinity estimates determined from temperature-corrected delta O-18 measurements on the benthic foraminifer Uvigerina spp. from deep and intermediate water-depth marine sediment cores to reconstruct the changes in density of sub-Antarctic South Atlantic water masses over the last deglaciation (i.e., 22-2 ka before present). We find that a major breakdown in the physical density stratification significantly lags the breakdown of the deep-intermediate chemical divide, as indicated by the chemical tracers of benthic foraminifer delta C-13 and foraminifer/coral C-14. Our results indicate that chemical destratification likely resulted in the first rise in atmospheric pCO(2), whereas the density destratification of the deep South Atlantic lags the second rise in atmospheric pCO(2) during the late deglacial period. Our findings emphasize that the physical and chemical destratification of the ocean are not as tightly coupled as generally assumed. Text Antarc* Antarctic Unknown Antarctic Proceedings of the National Academy of Sciences 113 3 514 519 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
envir geo |
spellingShingle |
envir geo Roberts, Jenny Gottschalk, Julia Skinner, Luke C. Peck, Victoria L. Kender, Sev Elderfield, Henry Waelbroeck, Claire Riveiros, Natalia Vazquez Hodell, David A. Evolution of South Atlantic density and chemical stratification across the last deglaciation |
topic_facet |
envir geo |
description |
Explanations of the glacial-interglacial variations in atmospheric pCO(2) invoke a significant role for the deep ocean in the storage of CO2. Deep-ocean density stratification has been proposed as a mechanism to promote the storage of CO2 in the deep ocean during glacial times. A wealth of proxy data supports the presence of a "chemical divide" between intermediate and deep water in the glacial Atlantic Ocean, which indirectly points to an increase in deep-ocean density stratification. However, direct observational evidence of changes in the primary controls of ocean density stratification, i.e., temperature and salinity, remain scarce. Here, we use Mg/Ca-derived seawater temperature and salinity estimates determined from temperature-corrected delta O-18 measurements on the benthic foraminifer Uvigerina spp. from deep and intermediate water-depth marine sediment cores to reconstruct the changes in density of sub-Antarctic South Atlantic water masses over the last deglaciation (i.e., 22-2 ka before present). We find that a major breakdown in the physical density stratification significantly lags the breakdown of the deep-intermediate chemical divide, as indicated by the chemical tracers of benthic foraminifer delta C-13 and foraminifer/coral C-14. Our results indicate that chemical destratification likely resulted in the first rise in atmospheric pCO(2), whereas the density destratification of the deep South Atlantic lags the second rise in atmospheric pCO(2) during the late deglacial period. Our findings emphasize that the physical and chemical destratification of the ocean are not as tightly coupled as generally assumed. |
format |
Text |
author |
Roberts, Jenny Gottschalk, Julia Skinner, Luke C. Peck, Victoria L. Kender, Sev Elderfield, Henry Waelbroeck, Claire Riveiros, Natalia Vazquez Hodell, David A. |
author_facet |
Roberts, Jenny Gottschalk, Julia Skinner, Luke C. Peck, Victoria L. Kender, Sev Elderfield, Henry Waelbroeck, Claire Riveiros, Natalia Vazquez Hodell, David A. |
author_sort |
Roberts, Jenny |
title |
Evolution of South Atlantic density and chemical stratification across the last deglaciation |
title_short |
Evolution of South Atlantic density and chemical stratification across the last deglaciation |
title_full |
Evolution of South Atlantic density and chemical stratification across the last deglaciation |
title_fullStr |
Evolution of South Atlantic density and chemical stratification across the last deglaciation |
title_full_unstemmed |
Evolution of South Atlantic density and chemical stratification across the last deglaciation |
title_sort |
evolution of south atlantic density and chemical stratification across the last deglaciation |
publisher |
Natl Acad Sciences |
url |
https://doi.org/10.1073/pnas.1511252113 https://archimer.ifremer.fr/doc/00421/53276/54569.pdf https://archimer.ifremer.fr/doc/00421/53276/54570.pdf https://archimer.ifremer.fr/doc/00421/53276/ |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Archimer, archive institutionnelle de l'Ifremer Proceedings Of The National Academy Of Sciences Of The United States Of America (0027-8424) (Natl Acad Sciences), 2016-01 , Vol. 113 , N. 3 , P. 514-519 |
op_relation |
doi:10.1073/pnas.1511252113 10670/1.bohsxz https://archimer.ifremer.fr/doc/00421/53276/54569.pdf https://archimer.ifremer.fr/doc/00421/53276/54570.pdf https://archimer.ifremer.fr/doc/00421/53276/ |
op_rights |
other |
op_doi |
https://doi.org/10.1073/pnas.1511252113 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
113 |
container_issue |
3 |
container_start_page |
514 |
op_container_end_page |
519 |
_version_ |
1766261182646190080 |