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

Autor: Batenburg SJ; Institut für Geowissenschaften, Goethe-Universität Frankfurt, Altenhöferallee 1, Frankfurt am Main, 60438, Germany. sietske.batenburg@earth.ox.ac.uk.; Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, UK. sietske.batenburg@earth.ox.ac.uk., Voigt S; Institut für Geowissenschaften, Goethe-Universität Frankfurt, Altenhöferallee 1, Frankfurt am Main, 60438, Germany., Friedrich O; Institut für Geowissenschaften, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 234-236, 69120, Heidelberg, Germany., Osborne AH; GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Wischhofstr. 1-3, Kiel, 24148, Germany., Bornemann A; Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, 30655, Hannover, Germany., Klein T; Institut für Geowissenschaften, Goethe-Universität Frankfurt, Altenhöferallee 1, Frankfurt am Main, 60438, Germany., Pérez-Díaz L; Department of Earth Sciences, Royal Holloway, University of London, Egham, TW20 0EX, UK., Frank M; GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Wischhofstr. 1-3, Kiel, 24148, Germany.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2018 Nov 23; Vol. 9 (1), pp. 4954. Date of Electronic Publication: 2018 Nov 23.
DOI: 10.1038/s41467-018-07457-7
Abstrakt: During the Late Cretaceous and early Cenozoic the Earth experienced prolonged climatic cooling most likely caused by decreasing volcanic activity and atmospheric CO 2 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 CO 2 from continental rifting marked a climatic tipping point contributing to a more efficient distribution of heat over the planet.
Databáze: MEDLINE
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