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

该奖项支持加州大学戴维斯分校化学工程与材料科学系Joseph D. Seymour博士和新西兰梅西大学物理系Paul T. Callaghan教授之间的合作研究。该项目将使用在地球磁场中工作的核磁共振（NMR）光谱仪，前往南极洲测量麦克默多湾第一年海冰内的盐水含量和盐水扩散。目标是获得第二季（第一季，NZAP事件K131, 10月至11月）。1995年)利用核磁共振数据来验证先前的结果，提供季节性冰变化的采样，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相关性。此外，还将测试一个系统，该系统将磁铁放置在冰的钻孔中，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PI在美国国家科学基金会博士后任期（1995-1996，梅西大学）期间所做的大量实验室核磁共振显微镜测量的数据分析，并准备一份实验室和实地研究的手稿。实验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。扩散数据提供了盐水迁移的方向和大小，有助于理解海冰中的对流热输送。这是第一次使用核磁共振显微镜定量表征NaCI/海冰结构。该项目是现场核磁共振方法在极地研究中的唯一应用，代表了核磁共振作为环境测量现场仪器的有效性。

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.