Dynamics of a Temperate Tidewater Glacier: LeConte Glacier Alaska

温带潮水冰川的动力学：阿拉斯加勒孔特冰川

• 批准号: 9806275
• 负责人: Roman Motyka
• 金额: $ 15.45万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-08-15 至 2000-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9806275&HistoricalAwards=false
• 关键词: Dynamics; Temperate; Tidewater; Glacier; LeConte

Abstract OPP-9806275 Motyka Echelmeyer The Le Conte Glacier is a rapidly retreating temperate glacier in southeastern Alaska. It has been stable for 33 years, but rapidly began to calve and retreat in December 1994. It has receded one kilometer over nine-months and is calving into 270-meter deep water. This proposal addresses many of the key issues and recommendations from the recent National Science Foundation (NSF)-sponsored tidewater glacier workshop. Previous studies on similar glaciers have focused on processes at and near the terminus. In this study, the Principal Investigators will measure and characterize a number of parameters along the entire length of the glacier and not just the snout or terminus. The objectives are to: 1) understand what controls the stability of calving glaciers; 2) characterize glacier calving, especially submarine events; and 3) measure and characterize proglacial sedimentation to assess its effects on the dynamics and stability of calving glaciers. Because the Le Conte Glacier is rapidly calving, this is a "time-critical" study and it is important to begin collecting data while the glacier is in the initial stages of the calving retreat. Repeated airborne elevation profiling, which has not been preciously used on glaciers, will be used to measure changes in surface geometry along the full length of the glacier on a seasonal and annual basis.

摘要摘要编号-9806275 Motyka Echelmeyer 勒孔特冰川（Le Conte Glacier）是位于阿拉斯加东南部的一个快速退缩的温带冰川。 它已经稳定了33年，但在1994年12月迅速开始崩解和退缩。 它在九个月的时间里后退了一公里，并在270米深的水中崩解。 该提案解决了最近由美国国家科学基金会（NSF）赞助的冰川研讨会上提出的许多关键问题和建议。 以前对类似冰川的研究集中在终点及其附近的过程。 在这项研究中，主要研究人员将测量和表征沿着冰川的整个长度沿着的一些参数，而不仅仅是鼻子或末端。 其目标是：1）了解是什么控制着崩解冰川的稳定性; 2）描述冰川崩解，特别是海底事件; 3）测量和描述冰前沉积，以评估其对崩解冰川的动态和稳定性的影响。 由于勒孔特冰川正在迅速崩解，这是一项“时间紧迫”的研究，在冰川处于崩解消退的初始阶段时开始收集数据是很重要的。 重复的空中高程剖面测量尚未在冰川上得到精确的应用，将用于测量沿着冰川全长的表面几何形状的季节性和年度性变化。