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RAPID: Surge of Negribreen, Svalbard

RAPID：内格里布林的涌动，斯瓦尔巴特群岛

基本信息

批准号：
1745705
负责人：
Ute Herzfeld
金额：
$ 8.5万
依托单位：
University of Colorado at Boulder
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-09-01 至 2020-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1745705&HistoricalAwards=false
关键词：
RAPID Surge Negribreen Svalbard

项目摘要

Changes in the rate at which glaciers flow into the ocean are a source of uncertainty in estimates of future sea level rise. Surges are brief events during which these rates increase up to 100 times greater than the normal flow rate. Surges, which typically last between a few months and a few years on any given glacier, occur at intervals of decades to centuries. Therefore, few detailed observations of surges are available for study. Negribreen, one of the largest glaciers in Svalbard, has started to surge last summer. This project will collect different data sets that will be used with satellite data to characterize the surging glacier. The project will contribute to STEM workforce development by supporting the training of a graduate student and an undergraduate student. Observations from this project will be added to an existing website and to develop presentations for the K-12 community.A combination of observations (laser altimetry, video, GPS data, photographs from small aircraft, and satellite data) and recently developed analysis approaches will be used to develop an understanding of glacier response (deformation, crevassing, acceleration, surge progression in the glacier system, elevation change and mass transfer) to surge dynamics. The principal investigator has been studying the 2011-2013 and 1993-1995 surges of the Bering-Bagley Glacier System, Alaska, using similar techniques and numerical modeling. Bering Glacier is a warm-based glacier and Negribreen a cold-based glacier. Results from the two systems will be compared and contrasted. It is anticipated that characteristics of surges common to different climate conditions may be isolated from those dependent upon specific environmental conditions.

冰川流入海洋的速度的变化是未来海平面上升估计的不确定性来源。喘振是短暂的事件，在此期间，这些速率增加到比正常流速大100倍。在任何冰川上，通常持续几个月到几年的浪涌，每隔几十年到几个世纪就会发生一次。因此，可供研究的涌浪详细观测资料很少。斯瓦尔巴特群岛最大的冰川之一内格里布林冰川去年夏天开始激增。该项目将收集不同的数据集，这些数据集将与卫星数据一起用于描述涌动的冰川的特征。该项目将通过支持一名研究生和一名本科生的培训，为STEM劳动力的发展做出贡献。该项目的观察结果将被添加到现有网站，并为K-12社区开发演示文稿。（激光测高、视频、全球定位系统数据、小型飞机拍摄的照片和卫星数据）以及最近开发的分析方法将用于了解冰川的反应（变形、裂隙、加速度、冰川系统中的浪涌进展、海拔变化和质量转移）到浪涌动力学。首席研究员一直在研究2011-2013年和1993-1995年阿拉斯加Bering-Bagley冰川系统的激增，使用类似的技术和数值模拟。白令冰川是一个温暖的冰川，而内格里布林冰川是一个寒冷的冰川。将对两个系统的结果进行比较和对比。预计不同气候条件下共有的浪涌特性可能与取决于具体环境条件的浪涌特性不同。