Development and application of seawater nutrient proxies in deep-sea corals

深海珊瑚海水营养物替代物的开发与应用

• 批准号: 0962260
• 负责人: Robert Sherrell
• 金额: $ 32.72万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-06-15 至 2015-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0962260&HistoricalAwards=false
• 关键词: Development; application; seawater; nutrient; proxies

Reconstruction of nutrient concentrations in past intermediate and deep waters is a critical goal in paleoceanography. Such information will allow calculation of intermediate/deep water mass mixing ratios in areas of active advection (e.g., the Atlantic), and when combined with radiocarbon dating will yield ventilation rates, which are thought to be an important control on atmospheric CO2. Past nutrient distributions can also yield information about productivity and remineralization in areas of more sluggish circulation. This award supports refinement and application of paleo-proxies for the nutrient phosphate (P/Ca) and the quasi-nutrient barium (Ba/Ca) in the solitary deep-sea coral D. dianthus. The research will produce a regional proxy calibration for the Southern Ocean using live-collected corals, and will then analyze fossil specimens to determine the evolution of endmember Southern source water nutrient content since the Last Glacial Maximum. They will also reconstruct the history of nutrient concentrations at mid to deep water depths in the NW Atlantic over the past 30ky using dated fossil corals from the New England seamounts. The research will provide a new, quantitative assessment of nutrient distribution in the past ocean. This work is part of a larger collaborative effort involving scientists from CalTech and Imperial College, London, who will provide both sample material and complementary data. Broader impacts include funding of a female PhD student as well as outreach efforts in association with the well-established COSEE (Center for Ocean Sciences Education Excellence) program at Rutgers University.

重建过去中层和深层水域的营养物浓度是古海洋学的一个关键目标。这些信息将允许计算平流活跃区域（例如大西洋）的中层/深水质量混合比，并且与放射性碳测年相结合将产生通风率，这被认为是对大气二氧化碳的重要控制。过去的养分分布还可以提供有关循环较缓慢地区的生产力和再矿化的信息。该奖项支持对孤生深海珊瑚石竹中营养磷酸盐 (P/Ca) 和准营养钡 (Ba/Ca) 的古代理进行改进和应用。该研究将使用活体采集的珊瑚对南大洋进行区域代理校准，然后分析化石样本，以确定自末次盛冰期以来南端水源水养分含量的演变。他们还将利用来自新英格兰海山的已测年化石珊瑚重建过去 30 年来西北大​​西洋中深水深度的营养物浓度历史。该研究将为过去海洋的营养分布提供新的定量评估。这项工作是来自加州理工学院和伦敦帝国理工学院科学家的更大合作的一部分，他们将提供样本材料和补充数据。更广泛的影响包括资助一名女博士生以及与罗格斯大学完善的 COSEE（海洋科学教育卓越中心）项目相关的外展工作。