Polar amplification of orbital-scale climate variability in the early Eocene greenhouse world
Abstract ∼ 56 –48 Ma) can exclude ice albedo effects, but the required tropical temperature records for resolving timescales shorter than multi-million years are lacking. Here, we reconstruct early Eocene tropical sea surface temperature variability by presenting an up to ∼ 4 kyr resolution biomarker-based temperature record from Ocean Drilling Program (ODP) Site 959, located in the tropical Atlantic Ocean. This record shows warming across multiple orbitally paced carbon cycle perturbations, coeval with high-latitude-derived deep-ocean bottom waters, showing that these events represent transient global warming events (hyperthermals). This implies that orbital forcing caused global temperature variability through carbon cycle feedbacks. Importantly, deep-ocean temperature variability was amplified by a factor of 1.7–2.3 compared to the tropical surface ocean, corroborating available long-term estimates. This implies that fast atmospheric feedback processes controlled meridional temperature gradients on multi-million year, as well as orbital, timescales during the early Eocene. p 2. We hypothesize that the responsible carbon cycle feedbacks that are independent of ice, snow, and frost-related processes might play an important role in Phanerozoic orbital-scale climate variability throughout geological time, including Pleistocene glacial–interglacial climate variability.
- Location
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Deutsche Nationalbibliothek Frankfurt am Main
- Extent
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Online-Ressource
- Language
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Englisch
- Bibliographic citation
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Polar amplification of orbital-scale climate variability in the early Eocene greenhouse world ; volume:20 ; number:6 ; year:2024 ; pages:1303-1325 ; extent:23
Climate of the past ; 20, Heft 6 (2024), 1303-1325 (gesamt 23)
- Creator
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Fokkema, Chris D.
Agterhuis, Tobias
Gerritsma, Danielle
de Goeij, Myrthe
Liu, Xiaoqing
de Regt, Pauline
Rice, Addison
Vennema, Laurens
Agnini, Claudia
Bijl, Peter K.
Frieling, Joost
Huber, Matthew
Peterse, Francien
Sluijs, Appy
- DOI
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10.5194/cp-20-1303-2024
- URN
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urn:nbn:de:101:1-2408051357033.890585643932
- Rights
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
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14.08.2025, 11:04 AM CEST
Data provider
Deutsche Nationalbibliothek. If you have any questions about the object, please contact the data provider.
Associated
- Fokkema, Chris D.
- Agterhuis, Tobias
- Gerritsma, Danielle
- de Goeij, Myrthe
- Liu, Xiaoqing
- de Regt, Pauline
- Rice, Addison
- Vennema, Laurens
- Agnini, Claudia
- Bijl, Peter K.
- Frieling, Joost
- Huber, Matthew
- Peterse, Francien
- Sluijs, Appy
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