Collaborative Research:History and Evolution of the Siple Coast Ice Stream Systems as Recorded by Former Shear-Margin Scars

9909518雷蒙德该奖项提供了三年的资金支持，以研究南极洲西部西普尔海岸冰流系统中众所周知的疤痕状特征。 拟议的现场工作的目的是确定几个尚未访问的疤痕的性质，并进一步表征以前确定的边缘疤痕，日期不清楚。 高级甚高分辨率辐射计和雷达卫星图像数据将用于定位和绘制地物图，并将其置于区域范围内。 该研究旨在描述西普尔海岸冰川的近代历史，并调查其结构变化的原因。 主要的调查工具将是低频RES和高频探地雷达剖面图，以便对内部地层进行成像，并测量埋藏裂缝或断裂地层的深度。 这一点，再加上从浅冰芯确定的积累率，将提供边缘特征的“关闭”年龄。 现场数据将为在主动剪切期间和停堆后的边缘和冰间流脊的冰流简单模型提供输入参数。 该建模将估计关闭时疤痕的初始高程以及当时相应的冰流高程。

9909518RaymondThis award provides support for three years of funding to study the scar-like features that are well-known from the Siple Coast ice stream system in West Antarctica. The objective of the proposed field work is to identify the nature of several as yet unvisited scars, and to further characterize previously-identified margin scars that are poorly dated. Advanced Very High Resolution Radiometer (AVHRR) and Radarsat image data will be used to locate and map the features, and place them in a regional context. The study seeks to describe the recent history of the Siple Coast glaciers and investigate the causes of their changes in configuration. The main investigative tools will be low-frequency RES and high-frequency ground penetrating radar (GPR) profiles to image internal layers and measure depths to buried crevasses or disrupted layering. This, coupled with accumulation rates determined from shallow ice cores, will provide "shutdown" ages for the margin features. The field data will provide input parameters for simple models of ice flow for margins and inter-ice stream ridges during active shearing and after shutdown. This modeling will estimate the initial elevation of a scar at the time of shut down and the corresponding ice stream elevation at that time.