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解有关的碳基的光化学进行的定量研究，从而旨在解释在深层冰芯中观察到的过量一氧化碳和二氧化碳气体水平。这种模棱两可的情况可能会大大增加与使用冰芯研究对古气候记录的相关性和代表性具有重要意义的问题有关的不确定性。具体地说，该项目将使用光谱技术和化学分析相结合的方法来表征各种选定的冰掺杂剂，随后将调查它们在近紫外光及其以上波长的单色光下的光化学反应和变化，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。这项研究应有助于更好地了解在深冰芯中发生的光化学过程，并为科学评估历史冰记录腐败的可能机制提供所需的重要数据。这项研究的基本性质适用于我们今后对古气候冰芯记录的理解，它涉及对地质气候的更广泛的科学影响，而更广泛的科学界影响通过学术、社区参与、技术转让和通过外联、少数群体和代表性不足的团体参与的能力建设以及对年轻地球科学家的指导和研究指导来解决。

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.