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900ka variability of the North Atlantic deep water mass Nd composition

北大西洋深水团 Nd 成分的 900ka 变化

基本信息

批准号：
261039032
负责人：
Professor Dr. Norbert Frank
金额：
--
依托单位：
Institut für Umweltphysik
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/261039032?language=en
关键词：
900ka variability North Atlantic deep

项目摘要

The Atlantic Meridional Overturning Circulation (AMOC) is a key player in the global climate system due to its large contribution regarding matter and heat transport across the hemispheres. Neodymium isotopes stored in the authigenic fraction of deep Atlantic sediments have been proven valuable tools to record such provenance changes across major and millennial climate variations. Therefore, in this proposed project we investigate this process of water mass competition in the deep North Atlantic over the past 1 million years at partly millennial resolution to reconstruct the long term evolution of deep water across numerous climate cycles. Moreover, we intend to retrieve the long term frequency of changes and possibly even discover yet unrecorded Dansgard/Oeschger events from deep sea sediments. The latter seems possible as a previous study has revealed a strong link between deep water Nd isotope composition and D/O events during the past 150ka (Böhm et al., 2015). The site of choice is the deep sea sediment core at ODP Leg 172 Site 1063, where measurements of authigenic Nd isotopes in Fe /Mn -leachates have successfully traced changes of deep water provenance related to millennial climate change (Böhm et al., 2015). Moreover, our first results from this project have revealed a unique pattern across MIS 11 and thus termination V. Within the frame of this project we intend to accomplish and complete the work initiated improving the time resolution of the record. The record established through this project has the potential to become an invaluable benchmark for the link between climate and deep water provenance in the Northwest Atlantic that will strongly improve our understanding of ocean - climate feedbacks.

大西洋经向翻转环流（AMOC）是全球气候系统中的一个关键角色，因为它对跨半球的物质和热量传输有很大的贡献。储存在深大西洋沉积物自生组分中的新同位素已被证明是记录主要和千年气候变化的物源变化的宝贵工具。因此，在这个拟议的项目中，我们调查了过去100万年来北大西洋深处的水团竞争过程，部分分辨率为千年，以重建深水在众多气候周期中的长期演变。此外，我们打算检索长期的变化频率，甚至可能发现尚未记录的Dansgard/Oeschger事件从深海沉积物。后者似乎是可能的，因为先前的研究已经揭示了在过去150 ka期间深水Nd同位素组成与D/O事件之间的强烈联系（Böhm等人，2015年）。选择的地点是ODP 172航次1063地点的深海沉积物岩心，在那里，对Fe /Mn沥滤液中自生Nd同位素的测量成功地追踪了与千年气候变化有关的深水物源变化（Böhm等人，2015年）的报告。此外，我们的第一个结果，从这个项目已经揭示了一个独特的模式，整个MIS 11，从而终止V。在这个项目的框架内，我们打算完成和完成的工作开始提高记录的时间分辨率。通过该项目建立的记录有可能成为西北大西洋气候与深水物源之间联系的宝贵基准，这将大大提高我们对海洋-气候反馈的理解。