Mapping the evolution of marine carbon during the last deglaciation: δ13C perspectives on the deglacial ocean carbon cycle

IF 10.8 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Earth-Science Reviews Pub Date : 2024-11-01 DOI:10.1016/j.earscirev.2024.104966
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Abstract

The changes in the ocean circulation and biological pump played crucial roles in the rise in atmospheric CO2 during the last deglaciation. However, our understanding remains limited regarding which processes―air-sea exchange, ocean circulation, and the biological pump―primarily influence the spatial dynamics of the oceanic carbon cycle. To address this knowledge gap, the present study compiles global stable carbon isotope (δ13C) records from various sources, including shallow and deep planktic, along with epifaunal and infaunal benthic foraminifera. The synthesis reveals a total increase of 0.37 ± 0.05 ‰ in marine δ13C values since the last glacial maximum. Of this increase, 68 ± 5 % is attributed to the response of the oceans in the southern hemisphere, while 32 ± 4 % is attributed to the northern hemisphere. By analyzing the difference between planktic and benthic foraminifera, a decreased vertical δ13C gradient (δ13Csp–sb) is observed during the last deglaciation, indicating rapid carbon exchange between surface and deep waters during deglaciation. Additionally, the offset between the epifaunal and infaunal δ13C (δ13Csb–db) provides insights into changes in productivity and bottom water oxygenation. Overall, the global synthesis suggests that the δ13C variation is largely controlled by ocean circulation in the northern hemisphere and at higher latitudes of the southern hemisphere, while primary production significantly influences subtropical regions. Furthermore, the δ13C confirms that the rise in atmospheric CO2 during the first phase of Heinrich Stadial 1 (HS1) resulted from reduced primary production in subtropical regions along with strong ventilation in the second phase of HS1. Interestingly, the δ13C variations during the Younger Dryas (YD) suggest strong ventilation without evident changes in primary production. This four-dimensional dataset provides valuable insights into the transient changes in the ocean carbon cycle during deglaciation.

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绘制末次冰期海洋碳演变图:δ13C 透视冰期海洋碳循环
大洋环流和生物泵的变化对上一次冰期大气中二氧化碳的上升起到了至关重要的作用。然而,我们对哪些过程--海气交换、大洋环流和生物泵--主要影响海洋碳循环的空间动态的了解仍然有限。为了弥补这一知识空白,本研究汇编了来自不同来源的全球稳定碳同位素(δ13C)记录,包括浅海和深海浮游生物,以及上、下底栖有孔虫。综合结果显示,自上一次冰川最大值以来,海洋δ13C值总共增加了0.37±0.05‰。其中,68 ± 5 % 的增长归因于南半球海洋的响应,32 ± 4 % 归因于北半球海洋的响应。通过分析浮游有孔虫和底栖有孔虫之间的差异,可以观察到在末次蜕变期间垂直δ13C梯度(δ13Csp-sb)减小,这表明在蜕变期间表层水和深层水之间的碳交换迅速。此外,表层动物和底层动物的δ13C(δ13Csb-db)之间的偏移也有助于了解生产力和底层水含氧量的变化。总之,全球综合结果表明,δ13C 的变化主要受北半球和南半球高纬度地区海洋环流的控制,而初级生产力对亚热带地区的影响很大。此外,δ13C 证实,在海因里希恒河 1 号(HS1)的第一阶段,大气中二氧化碳的上升是由于亚热带地区初级生产的减少以及 HS1 第二阶段强烈的通风造成的。有趣的是,少干世(YD)期间的 δ13C 变化表明,在初级生产没有明显变化的情况下出现了强烈的通风。这一四维数据集为了解脱冰期海洋碳循环的瞬时变化提供了宝贵的信息。
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来源期刊
Earth-Science Reviews
Earth-Science Reviews 地学-地球科学综合
CiteScore
21.70
自引率
5.80%
发文量
294
审稿时长
15.1 weeks
期刊介绍: Covering a much wider field than the usual specialist journals, Earth Science Reviews publishes review articles dealing with all aspects of Earth Sciences, and is an important vehicle for allowing readers to see their particular interest related to the Earth Sciences as a whole.
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