Pliocene evolution of the tropical Atlantic thermocline depth

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Abstract Mg/Ca, δ 18 O, and δ 13 C records from the late Pliocene interval at Ocean Drilling Program Site 959 in the Eastern Equatorial Atlantic (EEA), which we use to reconstruct ocean temperatures and relative changes in salinity and thermocline depth. Data were generated using surface-dwelling Globigerinoides ruber ∼ δ 18 O data from Site 959 and compare these to the Site 1000 in the Caribbean Sea. Over the course of the Pliocene, thermocline changes in the EEA and Caribbean Sea follow similar patterns, with prominent step-wise thermocline deepening between ∼  5.5 and 4.0 Ma and gradual shoaling up to the mPWP, followed by minor deepening at the end of the mPWP. The tropical thermocline depth evolution of the tropical Atlantic differs from the Pacific, which is characterized by gradual basin-wide shoaling across the Pliocene. These results potentially challenge the hypothesized link between tropical thermocline depth and global climate. The mechanisms behind the periodically divergent Pacific and Atlantic thermocline movements remain speculative. We suggest that they are related to basin geometry and heterogenous temperature evolutions in regions from where thermocline waters are sourced. A positive feedback loop between source region temperature and tropical cyclone activity may have amplified tropical thermocline adjustments.

Location: Deutsche Nationalbibliothek Frankfurt am Main

Extent: Online-Ressource

Language: Englisch

Bibliographic citation: Pliocene evolution of the tropical Atlantic thermocline depth ; volume:18 ; number:4 ; year:2022 ; pages:961-973 ; extent:13
Climate of the past ; 18, Heft 4 (2022), 961-973 (gesamt 13)

Creator: van der Weijst, Carolien M. H.
Winkelhorst, Josse
de Nooijer, Wesley
von der Heydt, Anna
Reichart, Gert-Jan
Sangiorgi, Francesca
Sluijs, Appy

DOI: 10.5194/cp-18-961-2022

URN: urn:nbn:de:101:1-2022050505190523342357

Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.

Last update: 15.08.2025, 7:30 AM CEST

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Associated

van der Weijst, Carolien M. H.
Winkelhorst, Josse
de Nooijer, Wesley
von der Heydt, Anna
Reichart, Gert-Jan
Sangiorgi, Francesca
Sluijs, Appy

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Pliocene evolution of the tropical Atlantic thermocline depth

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Mid-pliocene Atlantic Meridional Overturning Circulation not unlike modern

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