Study of Recent Ice-Volume Changes Along the Margin of the East Antarctic Ice Sheet

东南极冰原的边缘与横跨南极的维多利亚地山脉相邻，包含大量裸露的冰。冰原位于冰下脊的背风处，暴露出冰原的地层剖面。冰盖内的冰碛通过冰的消融而积聚在冰原上。根据冰流速度、陨石积累速率和石英中宇宙生成的10Be的丰度来定年，表明冰碛岩开始形成的时间不到10万年。冰碛形成的最合理的原因是冰盖厚度的减少，这是对冰盖积累区或冰盖边缘气候条件变化的反应。这项调查将通过恢复1986/87年期间设置的消融桩来确定Reckling冰碛附近冰盖的年消融速率。将收集紧密间隔的冰样本以记录时间上的不连续性，并用雷达测量冰的厚度。

The margin of the East Antarctic ice sheet adjacent to the Transantarctic mountains of Victoria Land contains large exposures of bare ice. The icefields are located in the lee of subglacial ridges and expose a stratigraphic cross-section of the ice sheet. Moraines within the ice sheet accumulate on these icefields by ablation of the ice. Dating based on ice-flow velocities, rates of meteorite accumulation, and the abundance of cosmogonic 10Be in quartz indicates that the moraines began to form less than 100,000 years ago. The most plausible cause for the formation of the moraines is a decrease in the thickness of the ice sheet in response to changes in climatic conditions either in the zone of accumulation or at the margin of the ice sheet. This investigation will determine the annual ablation rate of the ice sheet in the vicinity of the Reckling Moraine by recovering the ablation stakes set out during the 1986/87 season. Closely- spaced ice samples will be collected to document chronological discontinuities and ice thickness measurements will be made by radar.