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Isotope Fractionation Effect During Soil Uptake of Methane, Carbon Monoxide, and Hydrogen

土壤吸收甲烷、一氧化碳和氢气过程中的同位素分馏效应

基本信息

批准号：
9708446
负责人：
Paul Quay
金额：
$ 11万
依托单位：
University of Washington
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1997
资助国家：
美国
起止时间：
1997-08-15 至 2000-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9708446&HistoricalAwards=false
关键词：
Isotope Fractionation Effect During Soil

项目摘要

Isotope fractionation effect during soil uptake of methane, carbon monoxide and hydrogen This proposal was submitted in response to the Environmental Geochemistry and Biogeochemistry (EGB) solicitation, NSF 06-152. It is being jointly funded by the Divisions of Ocean Sciences and Atmospheric Science. The objective of this proposal is to measure isotope fractionation during soil uptake of carbon monoxide (CO), methane (CH4) and hydrogen (H2). These fractionation effects are important to quantify so that continued atmospheric measurements of these greenhouse gases can take full advantage of isotopic data to fingerprint specific sources and sinks. This will allow for a significant advancement in our understanding of the global cycles of these radiatively important trace gases. The PI's propose to empirically measure the isotopic fractionation effect using soil enclosures and measuring air samples collected as a time-series in the headspace. The site specific data will be extrapolated to regional and global scales using soil characteristics (e.g. temperature, moisture, porosity, composition, etc.). Overall, the proposed measurements, when coupled with on-going time series measurements of the isotopic composition of CH4, CO and anticipated measurements of H2, will provide the framework needed to determine the influence of soil uptake on the seasonal changes in the concentration and isotopic composition of these gases in temperate northern latitudes and on the interhemispheric asymmetry of their isotopic composition.

土壤吸收甲烷、一氧化碳和氢过程中的同位素分馏效应本提案是应环境地球化学和生物地球化学（EGB）的要求提交的，NSF 06-152。该项目由海洋科学司和大气科学司共同资助。本提案的目的是测量土壤吸收一氧化碳（CO），甲烷（CH 4）和氢（H 2）过程中的同位素分馏。这些分馏效应必须量化，以便对这些温室气体的持续大气测量能够充分利用同位素数据来确定具体的源和汇。这将使我们对这些具有重要辐射意义的微量气体的全球循环的理解有重大进展。 PI的建议，经验测量同位素分馏效应，使用土壤外壳和测量空气样品收集作为一个时间序列的顶部空间。将利用土壤特性（例如温度、湿度、孔隙度、成分等）将特定地点的数据外推到区域和全球范围。总的来说，拟议的测量，再加上持续的时间序列测量的同位素组成的甲烷，CO和预期的测量H2，将提供必要的框架，以确定土壤吸收的影响，这些气体的浓度和同位素组成的季节性变化，在温带北方纬度和半球间的不对称性，其同位素组成。