Radiocarbon as a Dating Tool and Tracer in Paleoceanography

IF 25.2 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Reviews of Geophysics Pub Date : 2022-01-12 DOI:10.1029/2020RG000720
L. C. Skinner, E. Bard
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引用次数: 13

Abstract

Radiocarbon is an extremely useful carbon cycle tracer and radiometric dating tool. Here, we review the main principles and challenges involved in the use of radiocarbon in paleoceanography. First, we present a conceptual framework in which there are three possible uses of a radiocarbon measurement: (a) to obtain a calendar age interval, or a fossil entity's age; (b) to obtain an estimate of a carbon reservoir's past radiocarbon activity; or (c) to compare the relative radiocarbon activities of two contemporary carbon reservoirs. We discuss the analysis of marine fossil material, the generation of an atmospheric reference curve, and the interpretation of marine radiocarbon “ventilation metrics” in relation to this reference curve. It is emphasized that marine radiocarbon integrates the influences of: changing radiocarbon production; air-sea gas exchange effects at the sea surface; transport times within the ocean interior; and the mixing of water parcels with different transit times from the sea surface, and different sea-surface sources. These controls are what make radiocarbon such a powerful paleoceanographic tracer, though the difficulty of disentangling them is what makes marine radiocarbon dating and tracer studies so challenging. We discuss the implementation of radiocarbon in numerical models, and explore the theory linking ocean-atmosphere partitioning of radiocarbon and CO2. Finally, we review existing records of marine radiocarbon variability over the last ∼25,000 years, which highlight the influence of ocean-atmosphere carbon exchange on past atmospheric CO2 and climate, and point to emerging opportunities for resolving the global radiocarbon- and carbon budgets over the last glacial cycle.

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放射性碳作为古海洋学测年工具和示踪剂
放射性碳是一种非常有用的碳循环示踪剂和放射性测年工具。在这里,我们回顾了放射性碳在古海洋学中使用的主要原理和挑战。首先,我们提出了一个概念框架,其中放射性碳测量有三种可能的用途:(a)获得日历年龄间隔或化石实体的年龄;(b)获得对碳库过去放射性碳活度的估计;或(c)比较两个当代碳储集层的相对放射性碳活度。我们讨论了海洋化石材料的分析,大气参考曲线的生成,以及与该参考曲线相关的海洋放射性碳“通风指标”的解释。强调海洋放射性碳综合了以下因素的影响:变化的放射性碳产量;海面海气交换效应;海洋内部的运输时间;以及来自不同海面和不同海面来源的不同过境时间的水团的混合。这些控制因素使放射性碳成为一种强大的古海洋示踪剂,尽管解开它们的困难使海洋放射性碳测年和示踪剂研究变得如此具有挑战性。我们讨论了放射性碳在数值模式中的实现,并探讨了放射性碳与CO2在海洋-大气中分配的理论联系。最后,我们回顾了过去~ 25000年来海洋放射性碳变率的现有记录,这些记录强调了海洋-大气碳交换对过去大气CO2和气候的影响,并指出了解决上一个冰期周期全球放射性碳和碳收支的新机会。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Reviews of Geophysics
Reviews of Geophysics 地学-地球化学与地球物理
CiteScore
50.30
自引率
0.80%
发文量
28
审稿时长
12 months
期刊介绍: Geophysics Reviews (ROG) offers comprehensive overviews and syntheses of current research across various domains of the Earth and space sciences. Our goal is to present accessible and engaging reviews that cater to the diverse AGU community. While authorship is typically by invitation, we warmly encourage readers and potential authors to share their suggestions with our editors.
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