Triple oxygen isotope variations in natural and anthropogenic carbon dioxide

我们将使用不同来源的气态二氧化碳的氧三同位素组成作为约束，以更好地了解地球S对流层的二氧化碳收支。不同的储集层(天然的、人为的)预计会有明显不同的(17O/(18O)比率(以∆17OTFL记数法表示)。对流层二氧化碳的∆170TFL将分别与土壤和人类呼吸、有机质燃烧(化石和现代)、石灰窑和高炉操作的二氧化碳的∆17O进行比较。将进行实验以确定CO2和H2O之间的17O/16O和18O/16O分馏。这些实验将被用来研究二氧化碳和水的平衡(例如，在叶片气孔、土壤、海洋中)对∆17OTFL的影响。结果将分别用于模拟生物层、对流层和平流层之间的二氧化碳交换。这项研究的一个组成部分是建立一种高准确度和精密度的测定二氧化碳∆170TFL的新技术。

We will use the oxygen triple isotope composition of gaseous CO2 of different provenance as constraint to better understand the CO2 budget in the Earth s troposphere. Different reservoirs (natural, anthropogenic) are expected to have distinctly different (17O/(18O ratios (expressed in form of the ∆17OTFL notation). The ∆17OTFL of tropospheric CO2 will be compared to ∆17O of CO2 from soil and human respiration, combustion of organic matter (fossil & modern), limekiln and blast furnace operation, respectively. Experiments will be conducted to determine the 17O/16O and 18O/16O fractionation between CO2 and H2O. The experiments will be used to study the effect of equilibration of CO2 with H2O (e.g in leaf stomata, soils, oceans) on ∆17OTFL. Results will be used to model the exchange of CO2 between bio-, tropo- and stratosphere, respectively. An integral part of this study is to establish a novel technique for the determination of ∆17OTFL of CO2 with high accuracy and precision.