Intermediate Water Records of Radiocarbon and Temperature Variability from the North Atlantic and Southern Ocean Using Deep-Sea Corals.

使用深海珊瑚记录北大西洋和南大洋的放射性碳和温度变化的中间水记录。

• 批准号: 1204211
• 负责人: Jess Adkins
• 金额: $ 47.21万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-01 至 2015-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1204211&HistoricalAwards=false
• 关键词: Intermediate; Water; Records; Radiocarbon; Temperature

Radiocarbon is a well-established tool for understanding past changes in ocean circulation and climate. However, recent studies of radiocarbon from intermediate water depths (~500 to 2,000 meters below sea level) have produced conflicting accounts of ocean behavior during the transition from the Last Glacial Maximum (LGM) to the Holocene. This project, led by a professor at the California Institute of Technology, seeks to resolve this problem by generating a new intermediate-depth radiocarbon record for the last 30,000 years using fossil deep-sea corals from the North Atlantic and Southern Oceans. A key advantage of this approach over measurements of plankton in sediment cores is the opportunity for uranium-series age control. Furthermore, fossil coral samples enable the collection of high-resolution measurements during key periods in the deglacial transition. For a subset of samples, proxy temperature data (from clumped isotopes) will be compared to radiocarbon content in order to better resolve changes in intermediate and deep water mass characteristics. Simple models will be used to provide a quantitative framework for the results of data analyses.This study will advance understanding of the role of ocean circulation in climate change on glacial time scales. Samples will be made broadly available through the developing CalTech deep-sea coral database, which is already in use by scientists from around the world. The investigator will continue collaboration with NOSAMS (National Ocean Sciences Mass Spectrometry Facility) to develop rapid and inexpensive techniques for radiocarbon dating of corals and other carbonates. The investigator will also continue ongoing climate science outreach efforts for local schools and organizations, as well as the broader public. Funding will support a female graduate student.

放射性碳是一种完善的工具，用于了解过去的海洋循环和气候变化。然而，最近对中等水深的放射性碳（海拔约500至2,000米）的研究导致了从最后一次冰川最大（LGM）过渡到全新世的过渡期间的海洋行为。该项目由加利福尼亚理工学院的一名教授领导，试图通过使用来自北大西洋和南部海洋的化石深海珊瑚产生新的30，000年中新的中等深度放射性碳记录来解决这一问题。这种方法比在沉积物核中浮游生物测量的关键优势是铀系列年龄控制的机会。此外，化石珊瑚样品可以在冰冰过渡中的关键时期内收集高分辨率测量值。对于样品的一部分，将将代理温度数据（来自集成的同位素）与放射性碳含量进行比较，以便更好地解决中间和深水质量特征的变化。简单模型将用于为数据分析的结果提供定量框架。这项研究将提高人们对海洋循环在气候变化在冰川时间尺度上的作用的了解。样品将通过开发的加州理工学院深海珊瑚数据库广泛提供，该数据库已经在世界各地的科学家使用。研究人员将继续与NOSAMS（国家海洋科学质谱设施）合作，以开发快速，廉价的技术，用于珊瑚和其他碳酸盐的放射性碳年代。调查人员还将继续为当地学校和组织以及更广泛的公众进行持续的气候科学外展工作。资金将支持女性研究生。