SGER: Columbia Glacier Photogrametry

Pfeffer 0228223该提案是作为探索性研究小额赠款（SGER）提交的，以记录阿拉斯加东南部哥伦比亚冰川因快速崩解而持续退缩的情况。 冰川目前正在以每年约0.74公里的速度退缩。 这种快速退缩伴随着每天高达33米的流速，使其成为世界上移动最快的冰川。 自1982年以来，自世纪中期以来，冰川终点已经后退了13公里多。 它将冰排入威廉王子湾超过22立方公里。明年，随着冰川终点通过一个限制其流动的缺口，冰川的模式和退缩速度可能会发生重大变化。 未来几个月的活动可能会为哥伦比亚冰川的长期命运提供重要线索，因为冰川床位于海平面以下的通道上。 主要调查员正在继续分析1999年、2000年和2001年的摄影测量数据，并将于2002年8月向国家统计局/国家统计局提交一份建议。然而，目前的终点位置和新计算的冰下地形可能意味着冰川处于退缩的临界状态，2002年底之前可能会发生重大事件。 这笔资金将使他们能够继续进行空中摄影到2002年，届时随着终点站进入更深的水域并通过一个主要的横向收缩，可能会发生重要的变化。

Pfeffer0228223This proposal was submitted as a Small Grant for Exploratory Research (SGER) to document to continuing retreat of the Columbia Glacier, in southeast Alaska by rapid calving. The Glacier is presently retreating at a rate of approximately .74 kilometers (km) per year. This rapid retreat has been accompanied by flow speeds up to 33 meters (m) per day, making it the world's fastest-moving glacier. Since 1982, the glacier terminus has retreated more than 13 km since the mid-eighteenth century. It discharges ice into Prince William Sound in excess of 22 km3 . Significant changes may be occurring in the glacier's pattern and speed of retreat during the next year as the glacier terminus passes through a gap which confines its flow. The activities over the next few months may provide important clues about the longer-term fate of Columbia Glacier as the retreat progresses up the channel where the glacier bed lies below sea-level. The Principal Investigators are continuing their analysis of photogrammetric data from 1999, 2000, and 2001 and will submit a proposal to OPP/ANS in August 2002. However, the present terminus position and newly calculated subglacial topography may mean that that the glacier is at a critical state in its retreat, and that significant events may occur before the end of 2002. The funds will allow them to continue the aerial photography through 2002 when important changes may occur as the terminus enters deeper water and passes a major lateral constriction.