δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2
Abrupt millennial-scale climate change events of the last deglaciation (i.e. Heinrich Stadial 1 and the Younger Dryas) were accompanied by marked increases in atmospheric CO2 (CO2atm) and decreases in its stable carbon isotopic ratios (δ13C), i.e. δ13CO2atm, presumably due to outgassing from the oce...
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Copernicus Publications
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fttriple:oai:gotriple.eu:oai:doaj.org/article:8f16a480067d45b5aea904a29c10da01 2023-05-15T17:35:02+02:00 δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2 M. C. Campos C. M. Chiessi I. Voigt A. R. Piola H. Kuhnert S. Mulitza 2017-04-01 https://doi.org/10.5194/cp-13-345-2017 http://www.clim-past.net/13/345/2017/cp-13-345-2017.pdf https://doaj.org/article/8f16a480067d45b5aea904a29c10da01 en eng Copernicus Publications 1814-9324 1814-9332 doi:10.5194/cp-13-345-2017 http://www.clim-past.net/13/345/2017/cp-13-345-2017.pdf https://doaj.org/article/8f16a480067d45b5aea904a29c10da01 undefined Climate of the Past, Vol 13, Iss 4, Pp 345-358 (2017) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2017 fttriple https://doi.org/10.5194/cp-13-345-2017 2023-01-22T19:08:29Z Abrupt millennial-scale climate change events of the last deglaciation (i.e. Heinrich Stadial 1 and the Younger Dryas) were accompanied by marked increases in atmospheric CO2 (CO2atm) and decreases in its stable carbon isotopic ratios (δ13C), i.e. δ13CO2atm, presumably due to outgassing from the ocean. However, information on the preceding Heinrich Stadials during the last glacial period is scarce. Here we present δ13C records from two species of planktonic foraminifera from the western South Atlantic that reveal major decreases (up to 1 ‰) during Heinrich Stadials 3 and 2. These δ13C decreases are most likely related to millennial-scale periods of weakening of the Atlantic meridional overturning circulation and the consequent increase (decrease) in CO2atm (δ13CO2atm). We hypothesise two mechanisms that could account for the decreases observed in our records, namely strengthening of Southern Ocean deep-water ventilation and weakening of the biological pump. Additionally, we suggest that air–sea gas exchange could have contributed to the observed δ13C decreases. Together with other lines of evidence, our data are consistent with the hypothesis that the CO2 added to the atmosphere during abrupt millennial-scale climate change events of the last glacial period also originated in the ocean and reached the atmosphere by outgassing. The temporal evolution of δ13C during Heinrich Stadials 3 and 2 in our records is characterized by two relative minima separated by a relative maximum. This w structure is also found in North Atlantic and South American records, further suggesting that such a structure is a pervasive feature of Heinrich Stadial 2 and, possibly, also Heinrich Stadial 3. Article in Journal/Newspaper North Atlantic Planktonic foraminifera Southern Ocean Unknown Southern Ocean Climate of the Past 13 4 345 358 |
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envir geo |
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envir geo M. C. Campos C. M. Chiessi I. Voigt A. R. Piola H. Kuhnert S. Mulitza δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2 |
topic_facet |
envir geo |
description |
Abrupt millennial-scale climate change events of the last deglaciation (i.e. Heinrich Stadial 1 and the Younger Dryas) were accompanied by marked increases in atmospheric CO2 (CO2atm) and decreases in its stable carbon isotopic ratios (δ13C), i.e. δ13CO2atm, presumably due to outgassing from the ocean. However, information on the preceding Heinrich Stadials during the last glacial period is scarce. Here we present δ13C records from two species of planktonic foraminifera from the western South Atlantic that reveal major decreases (up to 1 ‰) during Heinrich Stadials 3 and 2. These δ13C decreases are most likely related to millennial-scale periods of weakening of the Atlantic meridional overturning circulation and the consequent increase (decrease) in CO2atm (δ13CO2atm). We hypothesise two mechanisms that could account for the decreases observed in our records, namely strengthening of Southern Ocean deep-water ventilation and weakening of the biological pump. Additionally, we suggest that air–sea gas exchange could have contributed to the observed δ13C decreases. Together with other lines of evidence, our data are consistent with the hypothesis that the CO2 added to the atmosphere during abrupt millennial-scale climate change events of the last glacial period also originated in the ocean and reached the atmosphere by outgassing. The temporal evolution of δ13C during Heinrich Stadials 3 and 2 in our records is characterized by two relative minima separated by a relative maximum. This w structure is also found in North Atlantic and South American records, further suggesting that such a structure is a pervasive feature of Heinrich Stadial 2 and, possibly, also Heinrich Stadial 3. |
format |
Article in Journal/Newspaper |
author |
M. C. Campos C. M. Chiessi I. Voigt A. R. Piola H. Kuhnert S. Mulitza |
author_facet |
M. C. Campos C. M. Chiessi I. Voigt A. R. Piola H. Kuhnert S. Mulitza |
author_sort |
M. C. Campos |
title |
δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2 |
title_short |
δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2 |
title_full |
δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2 |
title_fullStr |
δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2 |
title_full_unstemmed |
δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2 |
title_sort |
δ13c decreases in the upper western south atlantic during heinrich stadials 3 and 2 |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/cp-13-345-2017 http://www.clim-past.net/13/345/2017/cp-13-345-2017.pdf https://doaj.org/article/8f16a480067d45b5aea904a29c10da01 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Planktonic foraminifera Southern Ocean |
genre_facet |
North Atlantic Planktonic foraminifera Southern Ocean |
op_source |
Climate of the Past, Vol 13, Iss 4, Pp 345-358 (2017) |
op_relation |
1814-9324 1814-9332 doi:10.5194/cp-13-345-2017 http://www.clim-past.net/13/345/2017/cp-13-345-2017.pdf https://doaj.org/article/8f16a480067d45b5aea904a29c10da01 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-13-345-2017 |
container_title |
Climate of the Past |
container_volume |
13 |
container_issue |
4 |
container_start_page |
345 |
op_container_end_page |
358 |
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1766134061680558080 |