U.S.-New Zealand Cooperative Research: Nuclear Magnetic Resonance Study of Antarctic Sea Ice Morphology

9726777 Seymour该奖项支持加州大学戴维斯分校化学工程和材料科学系Joseph D.Seymour博士和新西兰梅西大学物理系Paul T.Callaghan教授之间的合作工作。该项目将把一台在地球磁场中工作的核磁共振(核磁共振)光谱仪带到南极洲，测量麦克默多海峡第一年海冰中的卤水含量和卤水扩散。目标是获得第二季(第一季，NZAP赛事K131，10月至11月。1995年)的核磁共振数据，以验证先前的结果，提供季节性冰变化的样本，并建立核磁共振测量、冰结构和传统光学显微镜数据之间的关联。此外，将测试一种将磁铁放置在冰层钻孔中的系统，这对首席研究员来说是一项新技术。在新西兰的时间将用于完成对PI在NSF博士后任期(1995-1996年，梅西大学)期间进行的广泛实验室核磁共振显微镜测量的数据分析，并准备一份关于实验室和实地研究的手稿。实验室数据包括盐水通道结构的三维图像和扩散张量的空间分辨测量。扩散数据提供了卤水迁移率的方向和大小，有助于理解海冰中的对流热传输。这是首次使用核磁共振显微镜对NaCI/海冰结构进行定量表征。该项目是正在进行的极地研究领域核磁共振方法的唯一应用，代表着核磁共振作为环境测量领域仪器的有效性。

9726777 Seymour This award supports collaborative work between Dr. Joseph D. Seymour, Department of Chemical Engineering and Materials Science, University of California at Davis, and Professor Paul T. Callaghan, Department of Physics, Massey University, New Zealand. This project will take a Nuclear Magnetic Resonance (NMR) spectrometer which operates in the Earth's magnetic field, to Antarctica to measure brine content and brine diffusion within first year sea ice of McMurdo sound. The objective is to obtain a second season (1st season, NZAP Event K131, Oct.-Nov. 1995) of NMR data to validate prior results, provide sampling of seasonal ice variation and establish a correlation between NMR measurements, ice structures and traditional optical microscopy data. In addition, a system in which a magnet is placed in a bore hole in the ice will be tested, a technique new to the principal investigator. Time in New Zealand will be used to complete data analysis on extensive laboratory NMR microscopy measurements made during the PI's NSF postdoctoral tenure (1995-1996, Massey University) and prepare a manuscript on the laboratory and field studies. The laboratory data includes three dimensional images of brine channel structure and spatially resolved measurements of the diffusion tensor. The diffusion data provide the direction and magnitude of brine mobility, of use in understanding convective heat transport in sea ice. This is the first use of NMR microscopy to quantitatively characterize NaCI/sea ice structure. The project is the only application of field NMR methods to polar research being pursued and represents validation of NMR as a field instrument for environmental measurements.