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沃茨的营养盐浓度是古海洋学的一个重要目标。这些信息将有助于计算活跃平流区（例如，大西洋），并且当与放射性碳测年相结合时将产生通风率，这被认为是对大气二氧化碳的重要控制。过去的养分分布也可以产生有关生产力和更缓慢的流通领域的矿化信息。该奖项支持了深海孤生珊瑚D中营养磷酸盐（P/Ca）和准营养钡（Ba/Ca）古代用指标的改进和应用。石竹该研究将使用现场收集的珊瑚为南大洋进行区域代理校准，然后将分析化石标本，以确定自末次冰盛期以来南源水营养成分的演变。他们还将利用来自新英格兰海山的过时珊瑚化石，重建过去30公里内西北大西洋中深水层营养物质浓度的历史。这项研究将为过去海洋中的营养分布提供一种新的定量评估。这项工作是加州理工学院和伦敦帝国理工学院科学家更大合作努力的一部分，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，以及与罗格斯大学成熟的海洋科学教育卓越中心（COSEE）项目相关的外联工作。