Data/hora: 26/07/2024 23:00:42

Provedor de dados: 	Institutional Archive of Ifreme (ArchiMer)	
País: 	France	
Título: 	Moving beyond the age-depth model paradigm in deep-sea palaeoclimate archives: dual radiocarbon and stable isotope analysis on single foraminifera	
Autores: 	Lougheed, Bryan C.; Metcalfe, Brett; Ninnemann, Ulysses S.; Wacker, Lukas.	
Data: 	2018-04	
Ano: 	2018	
Resumo: 	Late-glacial palaeoclimate reconstructions from deep-sea sediment archives provide valuable insight into past rapid changes in ocean chemistry. Unfortunately, only a small proportion of the ocean floor with sufficiently high sediment accumulation rate (SAR) is suitable for such reconstructions using the long-standing age-depth model approach. We employ ultra-small radiocarbon (C-14) dating on single microscopic foraminifera to demonstrate that the long-standing age-depth model method conceals large age uncertainties caused by post-depositional sediment mixing, meaning that existing studies may underestimate total geochronological error. We find that the age-depth distribution of our C-14-dated single foraminifera is in good agreement with existing bioturbation models only after one takes the possibility of Zoophycos burrowing into account. To overcome the problems associated with the age-depth paradigm, we use the first ever dual C-14 and stable isotope (delta O-18 and delta C-13) analysis on single microscopic foraminifera to produce a palaeoclimate time series independent of the age-depth paradigm. This new state of the art essentially decouples single foraminifera from the age-depth paradigm to provide multiple floating, temporal snapshots of ocean chemistry, thus allowing for the successful extraction of temporally accurate palaeoclimate data from low-SAR deep-sea archives. This new method can address large geographical gaps in late-glacial benthic palaeoceanographic reconstructions by opening up vast areas of previously disregarded, low-SAR deep-sea archives to research, which will lead to an improved understanding of the global interaction between oceans and climate.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	https://archimer.ifremer.fr/doc/00497/60820/65117.pdf

https://archimer.ifremer.fr/doc/00497/60820/65118.zip

https://archimer.ifremer.fr/doc/00497/60820/65119.pdf

https://archimer.ifremer.fr/doc/00497/60820/65120.zip

DOI:10.5194/cp-14-515-2018

https://archimer.ifremer.fr/doc/00497/60820/	
Editor: 	Copernicus Gesellschaft Mbh	
Formato: 	application/pdf	
Fonte: 	Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2018-04 , Vol. 14 , N. 4 , P. 515-526	
Fonte: 	info:eu-repo/semantics/openAccess

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