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Inorganic geochemistry of Pliocene-Pleistocene sediments from the Bering Sea (IODP Expedition 323) - Studying feedbacks of productivity, nutrient availability, and redox conditions in the northernmost Pacific

白令海上新世-更新世沉积物的无机地球化学（IODP Expedition 323） - 研究最北太平洋生产力、养分可用性和氧化还原条件的反馈

基本信息

批准号：
180267101
负责人：
Professor Dr. Christian März
金额：
--
依托单位：
Lyell Centre for Earth and Marine Science and Technology
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2011-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/180267101?language=en
关键词：
Inorganic geochemistry Pliocene Pleistocene sediments

项目摘要

In 2009, Expedition 323 of the Integrated Ocean Drilling Program (IODP) recovered the first continuous sediment cores from the Bering Sea extending back 5 Million years. The unique IODP core material has considerable potential to unlock the environmental and climatic history of the Bering Sea. The Bering Sea is a large, yet poorly explored natural laboratory to study the development of climate-relevant biogeochemical element cycles in a high-productivity semi-restricted upwelling system on glacial-interglacial time scales. Moreover, the Bering Sea is of global relevance (a) due to its potential for atmospheric CO2 sequentation and its burial in the sea floor as organic matter over long time scales, and (b) due to the export of low-oxygen high-nutrient glacial water to the North Pacific and related effects on productivity, stratification, and carbon burial in the world´s largest ocean basin. Our main goal is to decipher biogeochemical dynamics and coupling that have hardly been studied both in the Bering Sea and globally so far, but may be of importance for atmosphere- ocean CO2 exchange and thus for climate dynamics on glacial-interglacial time scales: The feedbacks between primary productivity, middle and deep redox conditions, and nutrient recycling from the sediment. We will focus on sediments from two sites representative for the environmental regimes of the Bering Sea, namely open marine Site U1341, and Site U1343 at the continental slope. We will construct inorganic geochemical sediment records (Ba, Fe, P, redox-sensitive trace metals) to trace nutrient, productivity and ocean redox variations over the past 2-5 million years, but also to quantify diagenetic processes that affected primary environmental signals. To evaluate the effects of Pliocene- Pleistocene biogeochemical dynamics and interactions on a more global scale, we will compare our records from the Bering Sea to published data and interpretations from the North Pacific (e.g. ODP Leg 145). In summary, our main research topics are: 1. The development of bioproductivity and related carbon burial.2. The dynamics and coupling of Fe and P under variable redox conditions.3. The effects of early diagenesis on primary geochemical sediment signals.4. The relation between Pliocene-Pleistocene geochemical conditions in the Bering Sea and the North Pacific.

2009年，综合海洋钻探计划（IODP）的第323次探险从白令海恢复了500万年前的第一批连续沉积物岩心。独特的IODP核心材料具有相当大的潜力，可以解开白令海的环境和气候历史。在冰期-间冰期时间尺度上，白令海是研究高生产力半受限上升流系统中与气候相关的生物地球化学元素循环发展的一个大型但尚未得到充分探索的自然实验室。此外，白令海具有全球相关性(a)，因为它具有在长时间尺度上对大气CO2进行分层和作为有机物埋藏在海底的潜力，以及(b)由于向北太平洋输出低氧高营养的冰川水以及对世界上最大的海洋盆地的生产力、分层和碳埋藏的相关影响。我们的主要目标是破译生物地球化学动力学和耦合，这是迄今为止在白令海和全球范围内几乎没有研究过的，但可能对大气-海洋二氧化碳交换以及冰期-间冰期时间尺度上的气候动力学具有重要意义：初级生产力、中深层氧化还原条件和沉积物养分循环之间的反馈。我们将重点关注白令海两个具有代表性的地点的沉积物，即开放的海洋地点U1341和大陆斜坡的地点U1343。我们将构建无机地球化学沉积物记录（Ba, Fe， P，氧化还原敏感的微量金属）来追踪过去2- 500万年的营养，生产力和海洋氧化还原变化，同时也量化影响初级环境信号的成岩过程。为了在全球范围内评估上新世-更新世生物地球化学动力学和相互作用的影响，我们将把我们在白令海的记录与来自北太平洋的已发表数据和解释进行比较（例如ODP Leg 145）。综上所述，我们的主要研究课题是：1。生物生产力的发展及其相关的碳埋藏。不同氧化还原条件下铁和磷的动力学及其耦合。早期成岩作用对原生地球化学沉积信号的影响。白令海与北太平洋上新世-更新世地球化学条件的关系。