EAGER: Measurement of the Oxygen and Hydrogen Isotope Composition of Evaporating Water Using a Novel Cavity Ring-Down Technique

EAGER：使用新型腔衰荡技术测量蒸发水的氧和氢同位素组成

• 批准号: 1036078
• 负责人: Zachary Sharp
• 金额: $ 13.27万
• 依托单位: University of New Mexico
• 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: 2010-08-15 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1036078&HistoricalAwards=false
• 关键词: EAGER; Measurement; Oxygen; Hydrogen; Isotope

The Principal Investigator (PI) plans to: (1) To refine and apply a new experimental technique to measurements of the kinetic isotopic fractionation of water associated with evaporation and condensation; and (2) to calibrate a said instrument with traditional mass spectrometry techniques focusing on relatively low water vapor concentrations (6000 ppmv) and on the deuterium excess of water vapor. It is expected that both of these goals will be beneficial to a wide range of scientists with interest in hydrology and atmospheric climate dynamics. The PI has developed a novel experimental technique for measuring the fractionation associated with evaporation and condensation that takes advantage of the rapid analytical capabilities of newly commercially available laser-based cavity ring-down spectrometers (CRDS). The new technique has several advantages over traditional mass spectrometry as simultaneous, real-time measurements of water vapor concentration and water vapor hydrogen and oxygen isotopic ratios may be made. Preliminary evaporation data corroborate the published equilibrium fractionations (100% relative humidity), suggesting that this approach may provide a new way to advance understanding of isotopic fractionation during disequilibrium evaporation and condensation. This work is exploratory in nature and the approach largely untested and thus qualifies for an EAGER. This work will provide a foundation for future research in a wide range of hydrologic and atmospheric research. The research methodologies developed in this project will be published in peer-reviewed journals and presented at national conferences, and the project will partially fund the Ph.D. research of a female Ph.D. student.

首席研究员（PI）计划：（1）精炼并应用一种新的实验技术，以测量与蒸发和凝结相关的水的动态同位素分馏； （2）用传统的质谱技术校准上述仪器，重点是相对较低的水蒸气浓度（6000 ppmv）和水蒸气的氘过量。 可以预期，这两个目标将对对水文和大气气候动态感兴趣的广泛科学家有益。 PI开发了一种新型的实验技术，用于测量与蒸发和凝结相关的分馏，该技术利用了新近市售的基于激光的腔量降谱仪（CRDS）的快速分析能力。 这项新技术比传统质谱法具有多个优点，因为可以同时进行水蒸气浓度和水蒸气氢和氧同位素比的实时测量。 初步蒸发数据证实了已发布的平衡分馏（100％相对湿度），这表明这种方法可能会提供一种新的方法来提高对在不平衡蒸发和凝结过程中的同位素分馏。这项工作本质上是探索性的，而这种方法在很大程度上未经测试，因此有资格渴望。这项工作将为未来研究的基础，以在各种水文和大气研究中进行。该项目开发的研究方法将在同行评审的期刊上发表，并在国家会议上介绍，该项目将部分资助博士学位。女性博士的​​研究学生。