Oxidation, Photooxidation and Photodecomposition of Dicarbonylic and Ketocarboxylic Ice Core Dopants

该项目涉及对与冰芯中有机污染物的光分解有关的羰基的光化学进行定量研究，目的是解释在深冰芯中观察到的过量一氧化碳和二氧化碳气体水平。 这种模糊性可能会增加显着的不确定性与使用冰芯来研究问题的重要性和古气候记录的相关性和代表性。 具体而言，该项目将使用光谱技术和化学分析的组合来表征各种选定的冰掺杂剂，随后研究它们在近紫外波长及以上的单色光下的光化学反应和转化，并进一步测量含有实验室替代矿物粉尘的合成冰混合物中的气体形成速率。 这项研究应该能够更好地了解深冰芯中发生的光化学过程，并为科学评估历史冰记录可能的破坏机制提供所需的重要数据。 研究的基本性质，因为它适用于我们未来对古气候冰芯记录的理解，解决了更广泛的科学对地球气候的影响，更广泛的科学界的影响通过奖学金，社区参与，技术转让和能力建设外展，少数民族和代表性不足的群体参与，以及指导和研究方向的年轻地球科学家来解决。

This project involves quantitative studies on the photochemistry of the carbonylic group as pertains to photodecomposition of organic contaminants in ice cores and is thereby aimed at accounting for excess carbon monoxide and carbon dioxide gas levels observed in deep ice cores. Such ambiguities may increase significantly uncertainties associated with using ice cores to study issues of importance to the relevance and representativeness of paleoclimate records. Specifically, the project will use a combination of spectroscopic techniques and chemical analyses to characterize a variety of selected ice dopants, and subsequently investigate their photochemical reactions and transformations under monochromatic light at wavelengths at and above the near-UV, and further measure gaseous formation rates in synthesized ice mixtures containing a laboratory surrogate mineral dust. This study should lead to a better understanding of photochemical processes occurring in deep ice cores and provide important data required for a scientific evaluation of the possible mechanisms of corruption of historical ice records. The fundamental nature of the research as it applies to our future understanding of the paleoclimate ice core record addresses broader scientific impacts upon geoclimate, and broader scientific community impacts are addressed through scholarship, community involvement, technology transfer and capacity-building by outreach, minority and underrepresented group involvement, as well as mentoring and research direction of young geoscientists.