Benchmarking Spatial Patterns of Glacier Change

冰川变化的空间模式基准测试

基本信息

批准号：
1853705
负责人：
Jason Briner
金额：
$ 34.69万
依托单位：
SUNY at Buffalo
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-06-01 至 2022-11-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1853705&HistoricalAwards=false
关键词：
Benchmarking Spatial Patterns Glacier Change

项目摘要

This research will investigate global patterns of past glacier advance and retreat to analyze regional patterns of environmental variability. During times of global glacier recession, glaciers in different parts of the world behaved differently. The rate of glacier retreat varied through time, and in some cases, glacier retreat was interrupted by short intervals of glacier growth. These differential spatial patterns can help scientists predict future patterns of regional response to global environmental variability. In this project, using various earth science techniques, investigators will analyze glacial landforms in Alaska to affirm regional differences in rates of past glacier change. Alaska is a region where past glacier change is less well understood than other parts of the world, but one where regional glacier change was different from global patterns. Findings will contribute to an improved understanding of past regional environmental variability and thereby be an important data source for future modelling. The project's broader impacts include the career advancement of a scientist from an underrepresented group and includes the training of graduate and undergraduate students. Dissemination will include academic publications and public-oriented materials disseminated via national parks and native communities in Alaska. To better understand the trajectory of future glacier change, and related environmental variability, better regional influences on glacier behavior across the planet must be elucidated. For this reason, detailed knowledge of regional glacier change and their deviations from the global pattern are critically needed for paleoclimate and glacial-geomorphology communities. Carbon dioxide changes during the last deglaciation were tightly coupled to mountain glacier change. Yet, this compilation lacked data from the high latitudes. Recent research hypothesizes that carbon dioxide in modern times has overwhelmed regional drivers and has become the dominant control on glacier change. The proposed research aims address these ideas by filling in a key data gap. The investigators will test two hypotheses that are at the forefront of paleoclimate and glacier science. (1) Atmospheric carbon dioxide is the primary forcing mechanism of mountain glacier change. (2) Glaciers outside the North Atlantic region advanced during Heinrich stadials, but retreated prior to their terminations. The researchers will reconstruct a highly detailed mountain glacier record from the high northern latitudes, temporally spanning from the last deglaciation to the present. Because continental ice sheets covered most of the high northern latitudes during Ice Ages, there are few accessible sites that offer detailed glacier moraine sequences with materials that can be precisely dated. Because Alaska remained largely untouched by continental sheets during the last glacial period and was instead dominated by mountain glaciers, this is an ideal location to benchmark and develop a record of glacier change since last deglaciation. The PIs will combine cosmogenic Beryllium-10 dating of an exceptional moraine sequence in the Revelation Mountains in western Alaska with digital mapping and glacier equilibrium-line altitude analysis to test their hypotheses and to benchmark a regional record of mountain glacier change.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这项研究将研究过去冰川前进和撤退的全球模式，以分析环境变异性的区域模式。在全球冰川经济衰退时期，世界各地的冰川行为不同。冰川撤退的速率随时间变化，在某些情况下，冰川静修会因冰川生长的短时间而中断。这些差异空间模式可以帮助科学家预测区域对全球环境变异性的反应的未来模式。在该项目中，使用各种地球科学技术，研究人员将分析阿拉斯加的冰川地形，以确认过去冰川变化速率的区域差异。阿拉斯加是一个与世界其他地区相比，过去的冰川变化不太了解的地区，但是区域冰川变化与全球模式不同。调查结果将有助于改善对过去区域环境变异性的了解，从而有一个重要的数据源用于未来建模。该项目的更广泛的影响包括一名人数不足的小组的科学家的职业发展，包括对研究生和本科生的培训。传播将包括通过国家公园和阿拉斯加的土著社区传播的学术出版物和以公共为导向的材料。为了更好地了解未来冰川变化的轨迹以及相关的环境变异性，必须阐明区域对整个地球冰川行为的更好影响。因此，对于古气候和冰川地球形态社区而言，对区域冰川变化及其与全球模式的偏差非常需要详细的了解。在最后一次脱气过程中，二氧化碳变化紧密耦合到山地冰川变化。然而，这种汇编缺乏来自高纬度的数据。最近的研究假设，现代的二氧化碳使区域驱动因素不堪重负，并且已成为对冰川变化的主要控制。拟议的研究旨在通过填补关键数据差距来解决这些想法。研究人员将检验两个位于古气候和冰川科学的最前沿的假设。（1）大气二氧化碳是山地冰川变化的主要强迫机制。（2）北大西洋地区以外的冰川在海因里希体育场（Heinrich Stadials）前进，但在终止之前撤退。研究人员将重建高度详细的山地冰川记录，从北部高纬度地区，从最后的脱水到现在。由于大陆冰盖覆盖了冰期的大部分北部纬度，因此很少有可访问的地点提供详细的冰川冰ora序列，并具有可以精确过时的材料。由于阿拉斯加在最后一个冰川时期仍然很大程度上没有大陆床单，而是由山地冰川主导，因此自上次脱胶以来，这是一个理想的基准测试和发展冰川变化记录的理想场所。 PIS将结合阿拉斯加西部启示山山脉典型序列的宇宙基因氏芽孢杆-10与数字映射和冰川平衡线的高度分析，以测试其假设，并基于山地冰川的区别记录，以反映NSF的智力传统和跨越的范围。审查标准。