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

南极东部冰盖边缘近期冰量变化研究

• 批准号: 8716088
• 负责人: Gunter Faure
• 金额: $ 2.6万
• 依托单位: Ohio State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-06-15 至 1989-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8716088&HistoricalAwards=false
• 关键词: Study; Recent; Ice; Volume; Changes

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.

毗邻维多利亚地横贯南极山脉的东南极冰盖边缘含有大量裸露的冰。 冰原位于冰下山脊的背风处，暴露出冰盖的地层横截面。 冰盖内的冰碛因冰的消融而积聚在这些冰原上。 根据冰流速度、陨石堆积率和石英中宇宙起源 10Be 丰度进行的年代测定表明，冰碛在不到 10 万年前就开始形成。 形成冰碛的最可能的原因是冰盖厚度随着冰盖堆积区或冰盖边缘气候条件变化而减少。 这项调查将通过恢复 1986/87 季节期间设定的消融桩来确定 Reckling Moraine 附近冰盖的年度消融率。 将收集密集的冰样本以记录时间上的不连续性，并通过雷达进行冰厚度测量。