Consulta: creatorFacets:"Hodell, D."
Registros recuperados: 2
Data/hora: 09/06/2024 09:36:33

Radiocarbon evidence for enhanced respired carbon storage in the Atlantic at the Last Glacial Maximum
Provedor de dados: 5
Autores: Freeman, E.; Skinner, L. C.; Waelbroeck, C.; Hodell, D.
The influence of ocean circulation changes on atmospheric CO2 hinges primarily on the ability to alter the ocean interior's respired nutrient inventory. Here we investigate the Atlantic overturning circulation at the Last Glacial Maximum and its impact on respired carbon storage using radiocarbon and stable carbon isotope data from the Brazil and Iberian Margins. The data demonstrate the existence of a shallow well-ventilated northern-sourced cell overlying a poorly ventilated, predominantly southern-sourced cell at the Last Glacial Maximum. We also find that organic carbon remineralization rates in the deep Atlantic remained broadly similar to modern, but that ventilation ages in the southern-sourced overturning cell were significantly increased. Respired...
Tipo: Text
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00421/53241/54750.pdf

Atlantic Ocean ventilation changes across the last deglaciation and their carbon cycle implications
Provedor de dados: 5
Autores: Skinner, L. C.; Freeman, E.; Hodell, D.; Waelbroeck, C.; Vazquez Riveiros, Natalia; Scrivner, A.e.
Changes in ocean ventilation, controlled by both overturning rates and air‐sea gas exchange, are thought to have played a central role in atmospheric CO2 rise across the last deglaciation. Here we constrain the nature of Atlantic Ocean ventilation changes over the last deglaciation using radiocarbon and stable carbon isotopes from two depth transects in the Atlantic basin. Our findings broadly cohere with the established pattern of deglacial Atlantic overturning change, and underline the existence of active northern sourced deep‐water export at the Last Glacial Maximum (LGM). We find that the western Atlantic was less affected by incursions of southern‐sourced deep water, as compared to the eastern Atlantic, despite both sides of the basin being strongly...
Tipo: Text
Palavras-chave: Air&amp;#8208; Sea exchange; AMOC; Carbon cycle; Deglaciation; Radiocarbon; Ventilation.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00665/77717/79810.pdf