Age‐Depth Models for Tropical Marine Hemipelagic Deposits Improve Significantly When Proxy‐Based Information on Sediment Composition Is Included

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Paleoceanography and Paleoclimatology Pub Date : 2023-01-01 DOI:10.1029/2022PA004476

F. Peeters, H. V. D. van der Lubbe, Paulo Scussolini

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引用次数: 0

Abstract

Accurate age‐depth models for marine sediment cores are crucial for understanding paleo‐oceanographic and ‐climatic changes derived from these archives. To date, information on bulk sediment composition is largely ignored as a potential source of information to improve age‐depth models. In this study, we explore how bulk sediment composition can be qualitatively used to improve age‐depth models. We developed the BomDia algorithm, which produces age‐depth models with realistic sediment accumulation rates that co‐vary in harmony with the bulk sediment composition. We demonstrate that changes in the marine versus terrigenous sediment deposition, based on bulk sediment composition, can be used to significantly improve age‐depth models of hemipelagic marine deposits. Based on two marine records—each containing more than 20 radiocarbon (AMS 14C) dated levels—we show that the mean error of prediction of unused AMS 14C ages significantly improves from 3.9% using simple linear interpolation, to 2.4% (p = 0.003), when bulk sediment composition is included. The BomDia age‐depth modeling approach provides a powerful statistical tool to assess the validity of age control points used and also may assist in the detection of hiatuses. Testing and further development of the BomDia algorithm may be needed for application in depositional settings other than tropical hemipelagic.

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当包含基于代理的沉积物成分信息时，热带海洋半深海沉积物的年龄-深度模型显著改善

海洋沉积物岩心的准确年龄-深度模型对于理解从这些档案中得出的古海洋学和气候变化至关重要。到目前为止，关于整体沉积物成分的信息在很大程度上被忽视，这是改进年龄-深度模型的潜在信息来源。在这项研究中，我们探讨了如何定性地使用散装沉积物成分来改进年龄-深度模型。我们开发了BomDia算法，该算法生成了具有真实沉积物堆积率的年龄-深度模型，该模型与整体沉积物组成协调变化。我们证明，基于整体沉积物组成的海洋沉积物与陆源沉积物沉积的变化可用于显著改进半远洋海洋沉积物的年龄-深度模型。根据两份海洋记录——每一份都包含20多个放射性碳（AMS 14C）年代水平——我们表明，当包括散装沉积物成分时，未使用的AMS 14C年龄预测的平均误差从使用简单线性插值的3.9%显著提高到2.4%（p=0.003）。BomDia年龄深度建模方法提供了一个强大的统计工具来评估所用年龄控制点的有效性，也可能有助于检测间断。BomDia算法的测试和进一步开发可能需要在热带半上层以外的沉积环境中应用。

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来源期刊

Paleoceanography and Paleoclimatology Earth and Planetary Sciences-Atmospheric Science

CiteScore

6.20

自引率

11.40%

发文量

107

期刊介绍： Paleoceanography and Paleoclimatology (PALO) publishes papers dealing with records of past environments, biota and climate. Understanding of the Earth system as it was in the past requires the employment of a wide range of approaches including marine and lacustrine sedimentology and speleothems; ice sheet formation and flow; stable isotope, trace element, and organic geochemistry; paleontology and molecular paleontology; evolutionary processes; mineralization in organisms; understanding tree-ring formation; seismic stratigraphy; physical, chemical, and biological oceanography; geochemical, climate and earth system modeling, and many others. The scope of this journal is regional to global, rather than local, and includes studies of any geologic age (Precambrian to Quaternary, including modern analogs). Within this framework, papers on the following topics are to be included: chronology, stratigraphy (where relevant to correlation of paleoceanographic events), paleoreconstructions, paleoceanographic modeling, paleocirculation (deep, intermediate, and shallow), paleoclimatology (e.g., paleowinds and cryosphere history), global sediment and geochemical cycles, anoxia, sea level changes and effects, relations between biotic evolution and paleoceanography, biotic crises, paleobiology (e.g., ecology of “microfossils” used in paleoceanography), techniques and approaches in paleoceanographic inferences, and modern paleoceanographic analogs, and quantitative and integrative analysis of coupled ocean-atmosphere-biosphere processes. Paleoceanographic and Paleoclimate studies enable us to use the past in order to gain information on possible future climatic and biotic developments: the past is the key to the future, just as much and maybe more than the present is the key to the past.