Southern Ocean drives multi-decadal atmospheric CO2 rise during Heinrich Stadials
The last glacial period was punctuated by cold intervals in the North Atlantic region that culminated in extensive iceberg discharge events. These cold intervals, known as Heinrich Stadials, are associated with abrupt climate shifts worldwide. Here we present CO2 measurements from the West Antarctic...
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National Academy of Sciences
2024
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ftunivreading:oai:centaur.reading.ac.uk:115964 2024-06-23T07:45:47+00:00 Southern Ocean drives multi-decadal atmospheric CO2 rise during Heinrich Stadials Wendt, Kathleen A. Nehrbass-Ahles, Christoph Niezgoda, Kyle Noone, David Kalk, Michael Menviel, Laurie Gottschalk, Julia Rae, James W.B. Schmitt, Jochen Fischer, Hubertus Stocker, Thomas F. Juan, Muglia Ferreira, David Marcott, Shaun A. Brook, Edward Buizert, Chisto 2024-04-01 text https://centaur.reading.ac.uk/115964/ https://centaur.reading.ac.uk/115964/1/PNAS_Wendt2024_accepted.pdf en eng National Academy of Sciences https://centaur.reading.ac.uk/115964/1/PNAS_Wendt2024_accepted.pdf Wendt, K. A., Nehrbass-Ahles, C., Niezgoda, K., Noone, D., Kalk, M., Menviel, L., Gottschalk, J., Rae, J. W.B., Schmitt, J., Fischer, H., Stocker, T. F., Juan, M., Ferreira, D. <https://centaur.reading.ac.uk/view/creators/90005370.html> orcid:0000-0003-3243-9774 , Marcott, S. A., Brook, E. and Buizert, C. (2024) Southern Ocean drives multi-decadal atmospheric CO2 rise during Heinrich Stadials. Proceedings of the National Academy of Sciences of the United States of America. ISSN 0027-8424 (In Press) Article PeerReviewed 2024 ftunivreading 2024-06-11T15:12:43Z The last glacial period was punctuated by cold intervals in the North Atlantic region that culminated in extensive iceberg discharge events. These cold intervals, known as Heinrich Stadials, are associated with abrupt climate shifts worldwide. Here we present CO2 measurements from the West Antarctic Ice Sheet (WAIS) Divide (WD) ice core across Heinrich Stadials 2-5 at decadal-scale resolution. Our results reveal multi-decadal-scale jumps in atmospheric CO2 concentrations within each Heinrich Stadial. The largest magnitude of change (14.0 ± 0.8 ppm within 55 ± 10 years) occurred during Heinrich Stadial 4. Abrupt rises in atmospheric CO2 are concurrent with jumps in atmospheric CH4 and abrupt changes in the water isotopologues in multiple Antarctic ice cores, the latter of which suggest rapid warming of both Antarctica and Southern Ocean vapor source regions. The synchroneity of these rapid shifts points to wind-driven upwelling of relatively warm, carbon-rich waters in the Southern Ocean, likely linked to a poleward intensification of the Southern Hemisphere westerly winds. Using an isotope-enabled atmospheric circulation model, we show that observed changes in Antarctic water isotopologues can be explained by abrupt and widespread Southern Ocean warming. Our work presents evidence for a multi-decadal to century-scale response of the Southern Ocean to changes in atmospheric circulation, demonstrating the potential for dynamic changes in Southern Ocean biogeochemistry and circulation on human timescales. Furthermore, it suggests that anthropogenic CO2 uptake in the Southern Ocean may weaken with poleward strengthening westerlies today and into the future. Article in Journal/Newspaper Antarc* Antarctic Antarctica ice core Ice Sheet Iceberg* North Atlantic Southern Ocean CentAUR: Central Archive at the University of Reading Antarctic Southern Ocean West Antarctic Ice Sheet |
institution |
Open Polar |
collection |
CentAUR: Central Archive at the University of Reading |
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ftunivreading |
language |
English |
description |
The last glacial period was punctuated by cold intervals in the North Atlantic region that culminated in extensive iceberg discharge events. These cold intervals, known as Heinrich Stadials, are associated with abrupt climate shifts worldwide. Here we present CO2 measurements from the West Antarctic Ice Sheet (WAIS) Divide (WD) ice core across Heinrich Stadials 2-5 at decadal-scale resolution. Our results reveal multi-decadal-scale jumps in atmospheric CO2 concentrations within each Heinrich Stadial. The largest magnitude of change (14.0 ± 0.8 ppm within 55 ± 10 years) occurred during Heinrich Stadial 4. Abrupt rises in atmospheric CO2 are concurrent with jumps in atmospheric CH4 and abrupt changes in the water isotopologues in multiple Antarctic ice cores, the latter of which suggest rapid warming of both Antarctica and Southern Ocean vapor source regions. The synchroneity of these rapid shifts points to wind-driven upwelling of relatively warm, carbon-rich waters in the Southern Ocean, likely linked to a poleward intensification of the Southern Hemisphere westerly winds. Using an isotope-enabled atmospheric circulation model, we show that observed changes in Antarctic water isotopologues can be explained by abrupt and widespread Southern Ocean warming. Our work presents evidence for a multi-decadal to century-scale response of the Southern Ocean to changes in atmospheric circulation, demonstrating the potential for dynamic changes in Southern Ocean biogeochemistry and circulation on human timescales. Furthermore, it suggests that anthropogenic CO2 uptake in the Southern Ocean may weaken with poleward strengthening westerlies today and into the future. |
format |
Article in Journal/Newspaper |
author |
Wendt, Kathleen A. Nehrbass-Ahles, Christoph Niezgoda, Kyle Noone, David Kalk, Michael Menviel, Laurie Gottschalk, Julia Rae, James W.B. Schmitt, Jochen Fischer, Hubertus Stocker, Thomas F. Juan, Muglia Ferreira, David Marcott, Shaun A. Brook, Edward Buizert, Chisto |
spellingShingle |
Wendt, Kathleen A. Nehrbass-Ahles, Christoph Niezgoda, Kyle Noone, David Kalk, Michael Menviel, Laurie Gottschalk, Julia Rae, James W.B. Schmitt, Jochen Fischer, Hubertus Stocker, Thomas F. Juan, Muglia Ferreira, David Marcott, Shaun A. Brook, Edward Buizert, Chisto Southern Ocean drives multi-decadal atmospheric CO2 rise during Heinrich Stadials |
author_facet |
Wendt, Kathleen A. Nehrbass-Ahles, Christoph Niezgoda, Kyle Noone, David Kalk, Michael Menviel, Laurie Gottschalk, Julia Rae, James W.B. Schmitt, Jochen Fischer, Hubertus Stocker, Thomas F. Juan, Muglia Ferreira, David Marcott, Shaun A. Brook, Edward Buizert, Chisto |
author_sort |
Wendt, Kathleen A. |
title |
Southern Ocean drives multi-decadal atmospheric CO2 rise during Heinrich Stadials |
title_short |
Southern Ocean drives multi-decadal atmospheric CO2 rise during Heinrich Stadials |
title_full |
Southern Ocean drives multi-decadal atmospheric CO2 rise during Heinrich Stadials |
title_fullStr |
Southern Ocean drives multi-decadal atmospheric CO2 rise during Heinrich Stadials |
title_full_unstemmed |
Southern Ocean drives multi-decadal atmospheric CO2 rise during Heinrich Stadials |
title_sort |
southern ocean drives multi-decadal atmospheric co2 rise during heinrich stadials |
publisher |
National Academy of Sciences |
publishDate |
2024 |
url |
https://centaur.reading.ac.uk/115964/ https://centaur.reading.ac.uk/115964/1/PNAS_Wendt2024_accepted.pdf |
geographic |
Antarctic Southern Ocean West Antarctic Ice Sheet |
geographic_facet |
Antarctic Southern Ocean West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Antarctica ice core Ice Sheet Iceberg* North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica ice core Ice Sheet Iceberg* North Atlantic Southern Ocean |
op_relation |
https://centaur.reading.ac.uk/115964/1/PNAS_Wendt2024_accepted.pdf Wendt, K. A., Nehrbass-Ahles, C., Niezgoda, K., Noone, D., Kalk, M., Menviel, L., Gottschalk, J., Rae, J. W.B., Schmitt, J., Fischer, H., Stocker, T. F., Juan, M., Ferreira, D. <https://centaur.reading.ac.uk/view/creators/90005370.html> orcid:0000-0003-3243-9774 , Marcott, S. A., Brook, E. and Buizert, C. (2024) Southern Ocean drives multi-decadal atmospheric CO2 rise during Heinrich Stadials. Proceedings of the National Academy of Sciences of the United States of America. ISSN 0027-8424 (In Press) |
_version_ |
1802642326532653056 |