A Phosphorus Control on Oceanic Anoxic Events under Greenhouse Climates?

温室气候下磷对海洋缺氧事件的控制？

• 批准号: 2444531
• 金额: --
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2444531
• 关键词: Phosphorus; Control; Oceanic; Anoxic; Events

This project will examine controls on the development, spatial extent and duration of anoxia in the Cretaceous greenhouse ocean. Specifically, high resolution, multi-proxy records from shelf and deeper margin/basin sites, covering two contrasting greenhouse scenarios of differing intensity, will be studied to test orbital effects on: 1) Redox state: A state-of-the-art multiproxy approach will be used to distinguish between key water column redox states linked to potential perturbations of the Fe and S cycles.2) Response of the P cycle: P speciation will be utilized in order to understand the ocean biogeochemical response to changes in weathering and ocean redox.These records will unravel feedbacks between redox and P cycling on the shelf and in the deep basins, leading to a step-change in our understanding of some of the most dramatic perturbations to the Earth system of the last 120 million years. This, in turn, will inform on generic processes that likely operated during other episodes of ocean anoxia under past, and potentially future, greenhouse conditions.

本项目将研究白垩纪温室海洋缺氧的发展、空间范围和持续时间的控制因素。具体而言，将研究来自陆架和更深边缘/盆地地点的高分辨率、多代理记录，涵盖两种不同强度的对比温室情景，以测试轨道对以下方面的影响：1)氧化还原状态：将使用最先进的多代理方法来区分与铁和S循环潜在扰动相关的关键水柱氧化还原状态。2) P循环的响应：利用P的形态来了解海洋生物地球化学对风化和海洋氧化还原变化的响应。这些记录将揭示大陆架和深盆地中氧化还原和磷循环之间的反馈，从而使我们对过去1.2亿年来地球系统中一些最剧烈的扰动的理解发生了逐步变化。反过来，这将为在过去和潜在的未来温室条件下，在其他海洋缺氧事件中可能发生的一般过程提供信息。