Physical and Structural Properties of the Greenland Ice Sheet Project (GISP II) Deep Core

该奖项旨在支持一个为期三年的项目，以完成格陵兰冰盖项目2 （GISP2）冰芯的物理性质工作（视觉地层学分析、密度变化和c轴结构测量）。该项目的目标是：1)完成岩心的测年，使用所有可用的参数，尽可能提供高度精确的深度/年龄尺度；2)确定峰顶的累积历史，直至最大可能的深度；3)利用冰晶c轴结构和相关结构参数，对冰底200 ~ 300 m观测到的变形程度和性质进行评估；4)通过重复测量冰样密度和超声速度，继续监测冰的弛豫特性；5)对基底碎屑层进行详细检查，确定其组成和结构特征，并描绘富碎屑冰的成因和结合机制。＊＊＊

9321624 Gow This award is for support for a three year project to complete physical properties work (analysis of visual stratigraphy, density variations, and c-axis fabric measurements) on the Greenland Ice Sheet Project Two (GISP2) ice core. The objectives of this project are to: 1) complete the dating of the core, providing as highly accurate a depth/age scale as is possible using all available parameters; 2) determine the accumulation history at Summit to the maximum possible depth; 3) use ice crystal c-axis fabrics and related structural parameters to assess the extent and nature of the distortion which has been observed in the bottom 200-300 m of ice; 4) continue monitoring relaxation characteristics of the ice through repeated measurements of ice sample density and ultrasonic velocities; 5) carry out detailed examination of the basal debris layer to determine its compositional and structural characteristics and to delineate the origin and mechanics of incorporation of the debris-rich ice. ***