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| Main Authors: | , , , , , , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2020
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| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.912711 |
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| _version_ | 1867167677676519424 |
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| author | Gottschalk, Julia Michel, Elisabeth Thöle, Lena M Studer, Anja S Hasenfratz, Adam P Schmid, Nicole Mazaud, Alain Martínez-García, Alfredo Szidat, Sönke Jaccard, Samuel L |
| author_facet | Gottschalk, Julia Michel, Elisabeth Thöle, Lena M Studer, Anja S Hasenfratz, Adam P Schmid, Nicole Mazaud, Alain Martínez-García, Alfredo Szidat, Sönke Jaccard, Samuel L |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Past changes in ocean 14C disequilibria have been suggested to reflect the Southern Ocean control on global exogenic carbon cycling. Yet, the volumetric extent of the glacial carbon pool and the deglacial mechanisms contributing to release remineralized carbon, particularly from regions with enhanced mixing today, remain insufficiently constrained. Here, we reconstruct the deglacial ventilation history of the South Indian upwelling hotspot near Kerguelen Island, using high-resolution 14C-dating of smaller-than-conventional foraminiferal samples and multi-proxy deep-ocean oxygen estimates. We find marked regional differences in Southern Ocean overturning with distinct South Indian fingerprints on (early de-)glacial atmospheric CO2 change. The dissipation of this heterogeneity commenced 14.6 kyr ago, signaling the onset of modern-like, strong South Indian Ocean upwelling, likely promoted by rejuvenated Atlantic overturning. Our findings highlight the South Indian Ocean's capacity to influence atmospheric CO2 levels and amplify the impacts of inter-hemispheric climate variability on global carbon cycling within centuries and millennia. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_912711 |
| institution | PANGAEA |
| language | en |
| publishDate | 2020 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Radiocarbon and oxygen ventilation in the deep South Indian Ocean during the last deglaciation Gottschalk, Julia Michel, Elisabeth Thöle, Lena M Studer, Anja S Hasenfratz, Adam P Schmid, Nicole Mazaud, Alain Martínez-García, Alfredo Szidat, Sönke Jaccard, Samuel L Deglaciation; ocean circulation; Radiocarbon; Termination; ventilation Past changes in ocean 14C disequilibria have been suggested to reflect the Southern Ocean control on global exogenic carbon cycling. Yet, the volumetric extent of the glacial carbon pool and the deglacial mechanisms contributing to release remineralized carbon, particularly from regions with enhanced mixing today, remain insufficiently constrained. Here, we reconstruct the deglacial ventilation history of the South Indian upwelling hotspot near Kerguelen Island, using high-resolution 14C-dating of smaller-than-conventional foraminiferal samples and multi-proxy deep-ocean oxygen estimates. We find marked regional differences in Southern Ocean overturning with distinct South Indian fingerprints on (early de-)glacial atmospheric CO2 change. The dissipation of this heterogeneity commenced 14.6 kyr ago, signaling the onset of modern-like, strong South Indian Ocean upwelling, likely promoted by rejuvenated Atlantic overturning. Our findings highlight the South Indian Ocean's capacity to influence atmospheric CO2 levels and amplify the impacts of inter-hemispheric climate variability on global carbon cycling within centuries and millennia. |
| title | Radiocarbon and oxygen ventilation in the deep South Indian Ocean during the last deglaciation |
| topic | Deglaciation; ocean circulation; Radiocarbon; Termination; ventilation |
| url | https://doi.org/10.1594/PANGAEA.912711 |