Pre-aged terrigenous organic carbon biases ocean ventilation-age reconstructions in the North Atlantic.

Liu, Jingyu; Wang, Yipeng; Jaccard, Samuel L; Wang, Nan; Gong, Xun; Fang, Nianqiao; Bao, Rui (2023). Pre-aged terrigenous organic carbon biases ocean ventilation-age reconstructions in the North Atlantic. Nature communications, 14(1), p. 3788. Nature Publishing Group 10.1038/s41467-023-39490-6

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Changes in ocean ventilation have been pivotal in regulating carbon sequestration and release on centennial to millennial timescales. However, paleoceanographic reconstructions documenting changes in deep-ocean ventilation using 14C dating, may bear multidimensional explanations, obfuscating the roles of ocean ventilation played on climate evolution. Here, we show that previously inferred poorly ventilated conditions in the North Atlantic were linked to enhanced pre-aged organic carbon (OC) input during Heinrich Stadial 1 (HS1). The 14C age of sedimentary OC was approximately 13,345 ± 692 years older than the coeval foraminifera in the central North Atlantic during HS1, which is coupled to a ventilation age of 5,169 ± 660 years. Old OC was mainly of terrigenous origin and exported to the North Atlantic by ice-rafting. Remineralization of old terrigenous OC in the ocean may have contributed to, at least in part, the anomalously old ventilation ages reported for the high-latitude North Atlantic during HS1.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Jaccard, Samuel

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

2041-1723

Publisher:

Nature Publishing Group

Language:

English

Submitter:

Pubmed Import

Date Deposited:

26 Jun 2023 14:01

Last Modified:

16 Jul 2023 02:25

Publisher DOI:

10.1038/s41467-023-39490-6

PubMed ID:

37355680

BORIS DOI:

10.48350/184108

URI:

https://boris.unibe.ch/id/eprint/184108

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