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Benthic foraminiferal stable carbon isotopes as a proxy for organic matter fluxes to the sea floor

底栖有孔虫稳定碳同位素作为海底有机物通量的代表

基本信息

批准号：
251044754
负责人：
Professor Dr. Andreas Mackensen
金额：
--
依托单位：
Alfred-Wegener-Institut (AWI) Helmholtz-Zentrum für Polar- und Meeresforschung
依托单位国家：
德国
项目类别：
Research Grants
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/251044754?language=en
关键词：
Benthic foraminiferal stable carbon isotopes

项目摘要

We propose to enhance the applicability of benthic foraminiferal stable carbon isotope records as a quantitative proxy for the assessment of organic matter flux to the sea floor. We aim to develop such a proxy based on living (Rose Bengal stained) specimens of selected taxa from undisturbed surface sediments of the Mediterranean Sea. Sampling stations were selected from a narrow water depth interval between 500 and 1000 m and are located along strong gradients in surface water productivity and organic matter fluxes. The obtained isotope data will be related by multivariate statistical analyses to the site-specific environmental conditions and biogeochemical characteristics of the substrate. Specifically, we plan to establish a transfer function for the assessment of organic matter flux rates to the sea floor based on the stable carbon isotope signature of the shallow infaunal taxa Uvigerina mediterranea and U. peregrina. In addition, we will explore the potential influence of specific trophic conditions on the ontogenetic relation between test size and the stable carbon isotope signal of the studied taxa. Subsequently, the transfer function will be applied to published isotope records from late Holocene sediment intervals of the Mediterranean Sea in order to reconstruct regional short-term changes in organic matter fluxes and surface water productivity. Our new methodological approach will provide data for the validation of model experiments on the biogeochemical variability of the Mediterranean Sea.

我们建议加强底栖有孔虫稳定碳同位素记录的适用性，作为评估有机物通量到海底的定量代用指标。我们的目标是开发这样一个代理的基础上，生活（玫瑰红染色）标本的选定类群从地中海的原状表层沉积物。取样站是从500和1000米之间的狭窄水深间隔，位于沿着强梯度的地表水生产力和有机物通量。所获得的同位素数据将通过多元统计分析与特定场地的环境条件和基质的地球化学特征相关。具体而言，我们计划建立一个传递函数的基础上，稳定的碳同位素签名的浅底栖分类群Uvigerina meditianea和U的有机质通量率的海底评估。佩雷格里娜此外，我们将探讨潜在的影响，特定的营养条件的个体发育之间的关系测试大小和稳定的碳同位素信号的研究类群。随后，转移函数将被应用到发表的同位素记录从晚全新世沉积物间隔的地中海，以重建区域的短期变化，有机物通量和地表水生产力。我们的新方法将为验证地中海海洋地球化学变化的模型实验提供数据。