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Quantitative reconstruction of sea-level dynamics for the Late Pliocene to Early Pleistocene (Marine Isotope Stages MG1–78): An integrated approach using oxygen isotopes, Mg/Ca ratios and "clumped isotopes"

上新世晚期到更新世早期海平面动态的定量重建（海洋同位素阶段 MG1â78）：使用氧同位素、Mg/Ca 比率和“团块同位素”的综合方法

基本信息

批准号：
407653836
负责人：
Dr. Kim Alix Jakob
金额：
--
依托单位：
Institut für Geowissenschaften
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/407653836?language=en
关键词：
Quantitative reconstruction sea level dynamics

项目摘要

Sea-level rise represents a component of anthropogenic climate change with exceptionally high societal relevance. In light of the need for high-fidelity, quantitative projections of future sea-level change, it is mandatory to understand sea-level variability at timescales that do justice to the tempo of anthropogenic climate change (i.e., sub-millennial); at the same time, information on the lower-frequency (i.e., orbital-scale) baseline characteristics of sea-level change underlying the short-term variability is required for a full mechanistic understanding. Such information can be obtained from time intervals of Earths history that comprise climatic boundary conditions as they are to be encountered in the near future. Therefore, this project aims at accurately deciphering sea-level variability on human-relevant (i.e., sub-millennial) timescales under a warmer-than-modern climate. The selected target interval is the Late Pliocene to Early Pleistocene (~3.35 to 2.05 Myr, Marine Isotope Stages MG1 to 78) because it captures the full range of climatic boundary conditions relevant for understanding near-future climate change. Accurate, quantitative sea-level estimates will be generated through an innovative, integrated geochemical approach based on oxygen isotopes, Mg/Ca ratios and novel "clumped-isotope" paleothermometry applied to benthic foraminifera from the tropical Pacific Ocean (ODP Site 849). This approach represents a critical step forward with respect to more conventional oxygen-isotope- and Mg/Ca-based sea-level estimates. Notably, it will help resolving the substantial inconsistencies between the different deep-time (i.e., >500 kyr) sea-level reconstructions as they are yet available. Owing to the high temporal resolution of the new datasets, the project will also allow for the first time an in-depth comparison between the internal anatomy of a Late Pliocene/Early Pleistocene glacial and the structure of the relatively well-understood Late Pleistocene glacials.

海平面上升是人为气候变化的一个组成部分，具有特别高的社会相关性。鉴于需要对未来海平面变化进行高保真的定量预测，必须了解与人为气候变化的节奏相称的时间尺度上的海平面变化（即，与此同时，关于较低频率（即，为了全面了解其机理，需要对短期变化所依据的海平面变化的基线特征进行研究。这些信息可以从地球历史的时间间隔中获得，这些时间间隔包括在不久的将来遇到的气候边界条件。因此，该项目旨在准确地破译与人类相关的海平面变化（即，下千年）的时间尺度下比现代温暖的气候。选定的目标间隔是上新世晚期至早更新世（约3.35至2.05百万年，海洋同位素阶段MG 1至78），因为它捕捉了与了解近期气候变化相关的全部气候边界条件。将采用一种创新的综合地球化学方法，根据氧同位素、Mg/Ca比率和适用于热带太平洋底栖有孔虫的新的"成团同位素"古温度测量法（ODP 849号站点），对海平面进行准确的定量估计。这种方法是一个关键的一步，相对于更传统的氧同位素和镁/钙为基础的海平面估计。值得注意的是，它将有助于解决不同深度时间（即，> 500 kyr）海平面重建，因为它们还可用。由于新数据集的时间分辨率很高，该项目还将首次对上新世晚期/更新世早期冰川的内部解剖结构和相对较好理解的更新世晚期冰川的结构进行深入比较。