Development of a Laser Spectroscopy System for Analysis of 17Oexcess on Ice Cores

开发用于分析冰芯上 17O 过量的激光光谱系统

• 批准号: 1341360
• 负责人: Eric Steig
• 金额: $ 35.76万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-10-01 至 2017-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1341360&HistoricalAwards=false
• 关键词: Development; Laser; Spectroscopy; System; Analysis; Development; Laser; Spectroscopy; System; Analysis

Steig/1341360This award supports a two-year project to develop a method for rapid and precise measurements of the difference in 18O/16O and 17O/16O isotope ratios in water, referred to as the 17O-excess. Measurement of 17O-excess is a recent innovation in geochemistry, complementing traditional measurements of the ratios of hydrogen (D/H) and oxygen (18O/16O). Conventional measurements of 17O/16O are limited in number because of the time-consuming and laborious nature of the analyses, which involves the conversion of water to oxygen via fluorination, followed by high-precision mass spectrometry. This project will use a novel cavity ring-down spectroscopy (CRDS) system developed by a joint effort of the University of Washington and Picarro, Inc. (Santa Clara, CA), along with the Centre for Ice and Climate (Neils Bohr Institute, Copenhagen). The primary intellectual merit of the research is the improvement of the CRDS method for measurements of 17Oexcess of discrete samples of water, to obtain precision and accuracy competitive with conventional methods using mass spectrometry. This will be achieved by quantification of the effects of water vapor concentration variability and instrument memory, precise calibration of the instrument against standard waters, and improvements to the spectroscopic analyses. The CRDS system will also be coupled to continuous-flow systems for ice core analysis, in collaboration with the University of Colorado, Boulder. The goal is to have an operational system available for ice core processing associated with the next major U.S.-led ice core project at South Pole, in 2015-2017. The broader impacts of the research include the ability to measure 17O-excess in ambient atmospheric water vapor, which can be used to improve understanding of convection, moisture transport, and condensation. The instrument development work proposed here is relevant to research supported by several NSF-GEO programs, including Hydrology, Climate and Large Scale Dynamics, Paleoclimate, Atmosphere Chemistry, and both the Arctic and Antarctic Programs. This proposal will support a postdoctoral researcher.

Steig/1341360这项奖项支持为期两年的项目，以开发一种方法，用于快速，精确地测量水中18o/16o和17o/16o同​​位素比率的差异，称为17o-Excess。 17o筛选的测量是地球化学的最新创新，补充了氢（D/H）和氧气比率（18o/16o）的传统测量值。由于分析的时间耗时和费力，涉及通过氟化的水转化为氧，然后进行高精度质谱法，因此数量的常规测量值有限。 该项目将使用由华盛顿大学和Picarro，Inc。（加利福尼亚州圣克拉拉）的联合努力以及冰和气候中心（哥本哈根尼尔斯·鲍尔研究所）共同开发的新型腔环铃声（CRDS）系统。 这项研究的主要智力优点是改进了CRDS方法，用于测量17oExcess的离散水样品，以获得使用质谱法的常规方法获得精确性和准确性。这将通过量化水蒸气浓度变异性和仪器记忆的影响，对标准水的精确校准以及光谱分析的改进来实现。 CRDS系统还将与科罗拉多大学博尔德分校合作，将其与连续流系统进行冰核分析。目标是在2015 - 2017年的南极下一个由美国下一个主要的ICE核心项目相关的冰核加工系统。 这项研究的更广泛的影响包括在环境大气水蒸气中测量17o筛选的能力，这些能力可用于提高对对流，水分传输和凝结的理解。 这里提出的仪器开发工作与多个NSF-GEO计划的研究相关，包括水文学，气候和大规模动态，古气候，大气化学以及北极和南极计划。该建议将支持博士后研究人员。