Measurements of Stable Isotope Compositions of Greenhouse Gases in the Stratosphere & Upper Troposphere: Applications to Stratospheric Chemistry, Transport & Global Biogeoc

平流层温室气体稳定同位素组成的测量

• 批准号: 9901463
• 负责人: Kristie Boering
• 金额: $ 13.7万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-15 至 2001-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9901463&HistoricalAwards=false
• 关键词: Measurements; Stable; Isotope; Compositions; Greenhouse

This project is focused on studying the isotopic composition of chemically and radiatively important trace gases such as carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) in the stratosphere and upper troposphere. Continuous-flow isotope ratio mass spectrometry will be used to analyze a subset of whole air samples obtained from the NASA ER-2 high-altitude aircraft. The results will be interpreted in terms of (a) establishing a data base of the global-scale variations in stratospheric isotope compositions and (b) constraining isotope fractionation mechanisms in the stratosphere. Further objectives are to determine the feasibility of using isotopic observations to (a) quantify vertical and horizontal transport in the stratosphere, (b) distinguish chemical ozone loss from ozone changes due to transport alone, (c) improve estimates of stratosphere-troposphere exchange, and (d) derive improved estimates of the influence of stratospheric fractionation processes on the isotopic compositions of tropospheric N2O, CO2, and, by inference, O2.

本项目重点研究平流层和对流层上层中具有重要化学和辐射意义的微量气体，如二氧化碳（CO2）、甲烷（CH4）和氧化亚氮（N2O）的同位素组成。连续流同位素比质谱法将用于分析从NASA ER-2高空飞机获得的整个空气样本的子集。这些结果将从(a)建立平流层同位素组成全球尺度变化数据库和(b)限制平流层同位素分馏机制两方面进行解释。进一步的目标是确定利用同位素观测的可行性，以便(a)量化平流层中的垂直和水平输送，(b)区分化学臭氧损失与仅由输送引起的臭氧变化，(c)改进对平流层-对流层交换的估计，以及(d)改进对平流层分馏过程对对流层N2O、CO2以及由此推断的O2同位素组成的影响的估计。