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Article Dans Une Revue Science Advances Année : 2022

Global reorganization of deep-sea circulation and carbon storage after the last ice age

Patrick Rafter
Sophia K.V. Hines
Andrea Burke
Kassandra Costa
Julia Gottschalk
Mathis Hain
James W.B. Rae
John Southon
  • Fonction : Auteur
Maureen Walczak
Jimin Yu
Jess Adkins
Timothy Devries

Résumé

Using new and published marine fossil radiocarbon ( 14 C/C) measurements, a tracer uniquely sensitive to circulation and air-sea gas exchange, we establish several benchmarks for Atlantic, Southern, and Pacific deep-sea circulation and ventilation since the last ice age. We find the most 14 C-depleted water in glacial Pacific bottom depths, rather than the mid-depths as they are today, which is best explained by a slowdown in glacial deep-sea overturning in addition to a “flipped” glacial Pacific overturning configuration. These observations cannot be produced by changes in air-sea gas exchange alone, and they underscore the major role for changes in the overturning circulation for glacial deep-sea carbon storage in the vast Pacific abyss and the concomitant drawdown of atmospheric CO 2 .
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hal-03917706 , version 1 (02-01-2023)

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Patrick Rafter, William Gray, Sophia K.V. Hines, Andrea Burke, Kassandra Costa, et al.. Global reorganization of deep-sea circulation and carbon storage after the last ice age. Science Advances , 2022, 8 (46), ⟨10.1126/sciadv.abq5434⟩. ⟨hal-03917706⟩
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