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) 完善并应用一种新的实验技术来测量与蒸发和冷凝相关的水的动力学同位素分馏； (2)用传统的质谱技术校准所述仪器，重点关注相对较低的水蒸气浓度(6000ppmv)和水蒸气的氘过量。 预计这两个目标都将有益于对水文学和大气气候动力学感兴趣的广大科学家。 PI 开发了一种新颖的实验技术，用于测量与蒸发和冷凝相关的分馏，该技术利用了新商用激光腔衰荡光谱仪 (CRDS) 的快速分析功能。 与传统质谱法相比，新技术具有多个优点，因为可以同时实时测量水蒸气浓度以及水蒸气氢氧同位素比。 初步蒸发数据证实了已发表的平衡分馏（100％相对湿度），表明这种方法可能提供一种新方法来增进对不平衡蒸发和冷凝过程中同位素分馏的理解。这项工作本质上是探索性的，并且该方法基本上未经测试，因此符合 EAGER 的资格。这项工作将为未来广泛的水文和大气研究奠定基础。该项目开发的研究方法将在同行评审期刊上发表并在全国会议上发表，该项目将部分资助博士生。一位女性博士的​​研究学生。