Collaborative Research: Development of Tunable Infrared Laser Direct Absorption Spectroscopy (TILDAS) for clumped isotope analysis of CO2

合作研究：开发用于 CO2 聚集同位素分析的可调谐红外激光直接吸收光谱 (TILDAS)

• 批准号: 1649959
• 负责人: David Dettman
• 金额: $ 29.94万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-07-01 至 2019-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1649959&HistoricalAwards=false
• 关键词: Collaborative; Research; Development; Tunable; Infrared

This project is enabling the University of Arizona, University of Washington, and private sector partner Aerodyne Research to develop a next-generation laser spectroscopy system to measure combinations of carbon and oxygen isotopes that are known as "clumped isotopes." The new technology will enable researchers to study the earth's past climate at lower cost, with smaller sample sizes, and in greater numbers than is currently possible by mass spectrometry. The new instrument will make possible a large increase in the number of proxy measurements of past earth temperatures because it eliminates the need for separate estimates of oxygen isotopes. Such a system is expected to be adopted quickly by laboratories around the world for application to geologic, oceanographic, biologic, and atmospheric samples. This project links the University of Arizona and the University of Washington with Aerodyne Research in improving the precision of Aerodyne's Tunable Infrared Laser Direct Absorption Spectroscopy (TILDAS) system to make clumped isotope measurements of carbon dioxide that are competitive with current techniques using mass spectrometry. The key measurement is of the different isotopic combinations of carbon dioxide, such as carbon 13, oxygen 18, and oxygen 16. The ability to analyze samples that are 30 to 80 times smaller means that higher spatial resolution can be obtained to allow research into better time resolution such as that afforded by seasonally-banded shells. Other research opportunities include the ability to study soil processes and Holocene paleoclimate using layered soil carbonates from the Andes and northwestern US; seasonality and carbon cycle during the Early Eocene Climatic Optimum and Cretaceous greenhouse from lake and soil carbonates; and the detailed history of fluid-fault interactions, cross cutting relationships and multiple fluids preserved in calcite veins from paleo and active fault zones and hydrothermal systems.

该项目使亚利桑那大学、华盛顿大学和私营部门合作伙伴 Aerodyne Research 能够开发下一代激光光谱系统，以测量碳和氧同位素的组合，即所谓的“聚集同位素”。这项新技术将使研究人员能够以比目前质谱法更低的成本、更小的样本量和更多的样本量来研究地球过去的气候。新仪器将使过去地球温度的替代测量数量大幅增加，因为它消除了单独估计氧同位素的需要。这样的系统预计将很快被世界各地的实验室采用，应用于地质、海洋、生物和大气样本。该项目将亚利桑那大学和华盛顿大学与 Aerodyne Research 联合起来，提高 Aerodyne 可调谐红外激光直接吸收光谱 (TILDAS) 系统的精度，以对二氧化碳进行聚集同位素测量，这与现有的质谱技术具有竞争力。关键测量是二氧化碳的不同同位素组合，例如碳 13、氧 18 和氧 16。能够分析小 30 至 80 倍的样品意味着可以获得更高的空间分辨率，以便更好地进行研究时间分辨率，例如季节性带状贝壳所提供的时间分辨率。其他研究机会包括利用安第斯山脉和美国西北部的层状土壤碳酸盐研究土壤过程和全新世古气候的能力；早始新世气候最适期和白垩纪温室期间湖泊和土壤碳酸盐的季节性和碳循环；以及古断层带和活动断层带以及热液系统中方解石脉中保存的流体-断层相互作用、横切关系和多种流体的详细历史。