The Isotopic Composition of Atmospheric Formaldehyde, FormicAcid and Acetic Acid

本项目旨在评估 大气中甲醛、甲酸和乙酸的各种来源 酸在遥远的大陆位置内的美国从同位素 收集的样品组成。 在选定的地点： (a)大气中甲醛的碳同位素组成 将被确定并与主要的成分进行比较 甲烷和天然非甲烷 芳香烃. 这些来源的相对贡献， 因此，通过甲醛到一氧化碳的碳通量应该是 评估。 (b)结果表明，甲酸和 将测定非甲酸轻质单羧酸， 与甲醛和其他主要有机物相比， 人为和自然的排放量，以推断可能的来源 捐款. 具体而言，该项目将完善现有的收集和 后处理技术，测定13C和14C含量的三个 大气物种，估算本地植物的13 C含量 排放量，并确定相对人为影响。

This project seeks to evaluate the relative importance of the various sources of atmospheric formaldehyde, formic acid and acetic acid at remote continental locations within the US from the isotopic composition of collected samples. At chosen locations: (a) The carbon isotopic composition of atmospheric formaldehyde will be determined and compared to the compositions of the principal sources at those sites - methane and natural non-methane hydrocarbons. The relative contributions of these sources to the carbon flux through formaldehyde to carbon monoxide should thus be evaluated. (b) The carbon isotopic compositions of formic acid and non-formic light mono-carboxylic acids will be determined and compared to each other, to formaldehyde and to other major organic emissions, both anthropogenic and natural, to deduce likely source contributions. Specifically the project will refine existing collection and work-up techniques, determine the 13C and 14C content of the three atmospheric species, estimate the 13C content of local plant emissions, and determine the relative anthropogenic influence.