Insoluble Particles in the GISP2 Ice Core: (a) Analysis of Core Stratigraphy by Laser-Light Scattering (b) Changes in Minerology and Particle Size in Glacial Ice

9322401 Ram该奖项是对一个为期三年的项目的支持，该项目旨在完成格陵兰冰盖项目2(GISP2)冰芯的激光散射地层测量，使用固体技术和涉及融水分析的技术。目前，融水测量的分辨率只能分辨出大于3厘米的年层，因此无法通过融水的散射来正确分析1900米以下的冰。这些测量的分辨率将得到提高，以便能够用这种技术测量小至1厘米的年层。到目前为止，使用固体技术的测量只应用于无气泡的冰。它将证明，这项技术可以扩展到泡状冰，并将这种方法将被用于分析冰芯的所有剩余部分。激光散射测量将被校准，以便它们给出沿核心大于0.5微米的粒子数量的变化，而不仅仅是相对散射光强度。最后，选定的岩心部分将定期重新测量，以确定当气泡重新出现时，散射信号如何随时间变化。***

9322401 Ram This award is for support for a three year project to complete measurements of stratigraphy on the Greenland Ice Sheet Project Two (GISP2) ice core with laser-light scattering, using both a solid technique and a technqiue that involves analysis of meltwater. At present, the resolution of the meltwater measurements only allows annual layers larger than 3 cm to be distinguished, so ice below 1900 m cannot be properly analyzed by scattering from meltwater. The resolution of these measurements will be improved so that annual layers as small as 1 cm will be able to be measured by this technique. Measurements using the solid technique have, so far, only been applied to bubble-free ice. It will be demonstrated that this technique can be extended to bubbly ice and this method will be used to analyze all remaining sections of the ice core. The laser-light scattering measurements will be calibrated so that they give the variation in number of particles larger than 0.5 microns along the core, rather than just the relative scattered light intensity. Finally, selected sections of the core will be remeasured at regular time intervals to determine how the scattered signal changes with time as bubbles reemerge. ***