Applications of Advanced Laser Spectroscopy to the Ice Core Record of Changes in Climate and Methane Biogeochemistry

该奖项支持一个基于创新激光光谱技术开发和使用冰芯气体和同位素分析新分析工具的项目。测量将与不断融化冰芯垂直部分的样品处理技术相结合，通常在这种样品处理中浪费的古代空气将被释放和分析。拟议的工作集中在三个与气候相关的测量上，激光技术已经足够先进，使冰芯的应用成为可能。这些数据包括甲烷的大气浓度和稳定同位素组成（δ 13C和δ D）、一氧化碳混合比以及冰本身的同位素组成（δ D和δ 18O）。这些选择的生物地球化学原理是，甲烷混合比率与北半球的温度变化高度相关，并在冰芯研究中用作全球地层标志。甲烷同位素组成对于认识甲烷的来源和汇以及解决大型海洋水合物储层稳定性的争议具有重要意义。一氧化碳可以与甲烷及其同位素同时测量，它参与了生物地球化学循环，也控制着甲烷的混合比例。在冰芯研究中，水的稳定同位素是过去温度的基本示踪剂。这项工作将为极地研究带来新的尖端技术，并进一步发展。鉴于传统方法难以进行这些测量，因此提出的同位素方法在这方面尤为重要，因此提出的工作有可能改变冰中甲烷的同位素研究。测量在垂直剖面连续融化期间从冰芯释放的空气中的气体进行其他化学测量将节省宝贵的时间和宝贵的冰，并最终实时生成痕量大气气体数据。该项目将支持一名博士后研究员和一名研究生，并将涉及一名新教员，该教员将为学术界带来重要的行业经验。pi将参与针对少数民族研究生的招聘工作，博士后将参与各种推广工作，包括新闻采访，电视纪录片，实验室参观，为有天赋的中学生提供迷你课程，以及与俄勒冈科学与工业博物馆合作建立气候展览的新努力。

0944552/BrookThis award supports a project to develop and use a new analytical tool for ice core gas and isotope analyses based on an innovative laser spectroscopic technique. The measurements will be integrated with sample processing techniques that continuously melt vertical sections of ice core, and the ancient air that is normally wasted in such sample processing will be released and analyzed. The proposed work focuses on three climatically relevant measurements for which laser technology has sufficiently advanced that ice core applications are possible. These include the atmospheric concentration and stable isotopic composition of methane (delta 13C and delta D), the carbon monoxide mixing ratio, and the isotopic composition of the ice itself (delta D and delta 18O). The biogeochemical rationale for these choices is that methane mixing ratios are highly correlated with temperature change in the northern hemisphere and used as global stratigraphic markers in ice core studies. The methane isotopic composition is important for understanding sources and sinks of methane and addressing controversies over the stability of the large marine hydrate reservoir. Carbon monoxide, which can be measured simultaneously with methane and its isotopes, is involved in biogeochemical cycles that also control methane mixing ratios. The stable isotopes of water are basic tracers of past temperature in ice core research. The proposed work will bring new cutting-edge technology to polar research, and develop it further. The proposed isotopic methods are particularly important in this regard given that these measurements are difficult with traditional methods, the proposed work has the potential to transform isotopic studies of methane in ice. Measuring gases in air released from ice cores during continuous melting of vertical sections for other chemical measurements will save valuable time and precious ice and will ultimately generate trace atmospheric gas data in real time. The project will support both a postdoctoral researcher and a graduate student and will involve a new faculty member who is bringing significant industry experience to academia. The PIs will participate in recruitment efforts that target minority graduate students and post-docs will participate in a variety of outreach efforts, including news interviews, television documentaries, lab tours, mini-classes for gifted middle school students and a new effort with Oregon Museum of Science and Industry to build a climate exhibit.