Nitrogen and Carbon Isotope Paleo-Proxy Verification in the Southern Ocean

南大洋氮和碳同位素古代理验证

• 批准号: 9531761
• 负责人: Roger Francois
• 金额: $ 22.05万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-11-15 至 1999-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9531761&HistoricalAwards=false
• 关键词: Nitrogen; Carbon; Isotope; Paleo; Proxy

Over the last decade, several new deep-sea sediment proxies for important oceanic properties have been proposed and developed to varying degrees. An urgent need has been recognized, though, for verification and calibration studies, particularly in the Southern Ocean. This proposal focuses on sedimentary 15N/14N ( 15N) and organic 13C/12C ( 13C org), both of which have been shown in core top and surface ocean studies to exhibit large north/south gradients in the modern Southern Ocean. Within the JGOFS study region in the Pacific Sector of the Southern Ocean this research team will: 1) Confirm and calibrate the relationships between NO3 utilization and 13C in surface waters. 2) Determine the fidelity of transfer of the proxy signal to the seafloor. 3) Determine the magnitude and consistency of any diagenetic effects in the preservation of the proxy signals in the sediments and identify sedimentary fractions for which diagenetic effects are minimized. Measurements will be made on samples collected seasonally between the subtropical convergence and Ross Sea.

在过去十年中，提出了若干新的深海沉积物重要海洋特性代用指标，并在不同程度上得到发展。 不过，人们认识到迫切需要进行核查和校准研究，特别是在南大洋。 该建议的重点是沉积15 N/14 N（15 N）和有机13 C/12 C（13 C org），这两种物质在岩心顶部和表层海洋研究中都显示出在现代南大洋中具有很大的南北梯度。 在南大洋太平洋部分的JGOFS研究区域内，该研究小组将：1）确认和校准表层沃茨中NO3利用与13 C之间的关系。 2)确定代理信号传输到海底的保真度。 3)确定在保存沉积物中代用信号方面任何成岩作用的大小和一致性，并确定成岩作用最小的沉积物组分。 测量将对在副热带辐合区和罗斯海之间季节性收集的样本进行。