气候变化领域集成服务门户(CCPortal): Quantifying Benthic δ18O Lags Across Termination 1: A Probabilistic Approach Based on Radiocarbon and Benthic δ18O Chronologies

CCPortal

DOI	10.1029/2023GC011068
	Quantifying Benthic δ18O Lags Across Termination 1: A Probabilistic Approach Based on Radiocarbon and Benthic δ18O Chronologies
	Rand, D.; Lisiecki, L. E.; Lee, T.; Lawrence, C. W.; Gebbie, G.
发表日期	2024
EISSN	1525-2027
起始页码	25
结束页码	2
卷号	25 期号:2
英文摘要	Temporal offsets (lags) between benthic delta O-18 (delta O-18(b)) signals in different locations are not only a source of age model uncertainty during delta O-18(b) stratigraphic alignment but also provide an opportunity to improve reconstructions of deep ocean circulation change during Termination 1 (T1). While methods based on the visual identification of identical delta O-18(b) features have previously been used to estimate lags, here we present a novel method to calculate delta O-18(b) lags and their statistical uncertainties by subtracting a core's radiocarbon age model from an age model based on its delta O-18(b) alignment to a target stack. This method produces lag estimates as a function of time with statistical uncertainties. As an example of this approach, we calculate lags for a depth transect of 12 cores in the Brazil Margin, whose lags were described qualitatively by Lund et al. (2015, ). Our new methodology supports a previously described lag between mid-depth (1,802-2,296 m) and deep (2,500-2,951 m) water; specifically, we find a statistically significant lag across this boundary throughout T1, with a maximum of 2.08 kyr (95% credible interval: 1.36-2.85) at 14 ka BP. We also identify statistically significant lags between intermediate (1,105-1,627 m) and mid-depth cores that were not previously described. Furthermore, we demonstrate that the Brazil Margin delta O-18(b) lags during T1 are inconsistent with a tracer transport model under modern circulation pathways (Gebbie, 2012, ) that fits an Atlantic-Pacific delta O-18(b) lag.
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001158418600001
来源期刊	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/300941
作者单位	University of California System; University of California Santa Barbara; Brown University; Brown University; Woods Hole Oceanographic Institution
推荐引用方式 GB/T 7714	Rand, D.,Lisiecki, L. E.,Lee, T.,et al. Quantifying Benthic δ18O Lags Across Termination 1: A Probabilistic Approach Based on Radiocarbon and Benthic δ18O Chronologies[J],2024,25(2).
APA	Rand, D.,Lisiecki, L. E.,Lee, T.,Lawrence, C. W.,&Gebbie, G..(2024).Quantifying Benthic δ18O Lags Across Termination 1: A Probabilistic Approach Based on Radiocarbon and Benthic δ18O Chronologies.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,25(2).
MLA	Rand, D.,et al."Quantifying Benthic δ18O Lags Across Termination 1: A Probabilistic Approach Based on Radiocarbon and Benthic δ18O Chronologies".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 25.2(2024).