Major intensification of Atlantic overturning circulation at the onset of Paleogene greenhouse warmth.

Batenburg, S J; Voigt, S; Friedrich, O; Osborne, A H; Bornemann, A; Klein, T; Pérez-Díaz, L; Frank, M

Batenburg, S J; Voigt, S; Friedrich, O; Osborne, A H; Bornemann, A; Klein, T; Pérez-Díaz, L; Frank, M.

Afiliación

Batenburg SJ; Institut für Geowissenschaften, Goethe-Universität Frankfurt, Altenhöferallee 1, Frankfurt am Main, 60438, Germany. sietske.batenburg@earth.ox.ac.uk.
Voigt S; Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, UK. sietske.batenburg@earth.ox.ac.uk.
Friedrich O; Institut für Geowissenschaften, Goethe-Universität Frankfurt, Altenhöferallee 1, Frankfurt am Main, 60438, Germany.
Osborne AH; Institut für Geowissenschaften, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 234-236, 69120, Heidelberg, Germany.
Bornemann A; GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Wischhofstr. 1-3, Kiel, 24148, Germany.
Klein T; Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, 30655, Hannover, Germany.
Pérez-Díaz L; Institut für Geowissenschaften, Goethe-Universität Frankfurt, Altenhöferallee 1, Frankfurt am Main, 60438, Germany.
Frank M; Department of Earth Sciences, Royal Holloway, University of London, Egham, TW20 0EX, UK.

Nat Commun ; 9(1): 4954, 2018 11 23.

Article en En | MEDLINE | ID: mdl-30470783

RESUMEN

During the Late Cretaceous and early Cenozoic the Earth experienced prolonged climatic cooling most likely caused by decreasing volcanic activity and atmospheric CO2 levels. However, the causes and mechanisms of subsequent major global warming culminating in the late Paleocene to Eocene greenhouse climate remain enigmatic. We present deep and intermediate water Nd-isotope records from the North and South Atlantic to decipher the control of the opening Atlantic Ocean on ocean circulation and its linkages to the evolution of global climate. The marked convergence of Nd-isotope signatures 59 million years ago indicates a major intensification of deep-water exchange between the North and South Atlantic, which coincided with the turning point of deep-water temperatures towards early Paleogene warming. We propose that this intensification of Atlantic overturning circulation in concert with increased atmospheric CO2 from continental rifting marked a climatic tipping point contributing to a more efficient distribution of heat over the planet.

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2018 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Reino Unido

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