Doctoral Dissertation Research: A Geospatial Analysis of Alpine Glacial Variability

这一博士论文研究改进项目将使用地理空间分析来评估从20世纪初到现在的遥远高山冰川的变化程度。分析将使用卫星图像和最近从历史探险中找回的航空照片的档案。这项研究的发现将有助于人们对偏远地区高山冰川历史的有限了解，并对未来对冰川融化和全球海平面变化的估计产生影响。这项研究将利用一组独特的历史航空照片，这些照片作为数据来源一直未得到充分利用，从而为评估区域范围内的高山冰川变化提供了机会。这项研究将促进与丹麦自然历史博物馆的新的国际合作，并吸引本科生参与极地地理空间研究。这位博士生和她的导师将为芝加哥公立学区的K-12 STEM教师开设研讨会。作为博士论文研究改进奖，该奖项还将提供支持，使有前途的学生能够建立强大的独立研究生涯。以前对偏远冰川的研究大多局限于20世纪末和21世纪初的卫星时代。因此，这些冰川和冰盖的长期、全新世历史一般不为人所知，尽管它们对全球海平面很重要。与未来特别相关的是，人们对它们对过去持续变暖时期的敏感性知之甚少。为了更好地估计过去的冰川活动以及未来的冰川变化，博士生将利用历史航空照片、陆地卫星和Worldview卫星数据以及几个开源的数字分析工具来重建历史上的冰川范围和面积，并建立冰川平衡线海拔模型(ELA)。与利用同一地区的湖泊沉积物重建全新世长期冰川历史的相关研究相结合，这一互补性的地理空间分析将把20世纪和21世纪的冰川变异性置于更长期的视角中。虽然这一研究项目将侧重于南格陵兰岛的高山冰川，但它对于更广泛地了解全球环境变化的影响具有很高的相关性。这项研究旨在开发改进的冰川变化历史分析方法，这将对包括美国境内在内的许多其他地方的自然资源管理有用。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This doctoral dissertation research improvement project will use geospatial analysis to evaluate the extent of changes in remote alpine glaciers from the early 20th century to the present. The analysis will use satellite images and an archive of recently recovered air-photos from historical expeditions. Findings from the study will contribute to the limited knowledge of alpine glacier histories in remote regions, with implications for future estimates of ice loss and global sea-level change. The research will capitalize on a unique collection of historical air-photos, which have been underutilized as a source of data, thereby providing an opportunity to assess alpine glacier change on a regional scale. This study will foster a new international collaboration with the Natural History Museum of Denmark and engage undergraduate students in polar geospatial research. The doctoral student and her advisor will develop workshops for K-12 STEM teachers from the Chicago public-school district. As a Doctoral Dissertation Research Improvement award, this award also will provide support to enable a promising student to establish a strong independent research career.Most previous studies of remote glaciers have been restricted to the satellite era of the late 20th and early 21st centuries. Thus, the long-term, Holocene, history of these glaciers and ice caps is generally not well known, despite their importance to global sea level. Of particular relevance to the future, their sensitivity to sustained periods of past warming is poorly understood. To facilitate improved estimates of past glacier activity as well as future glacier change, the doctoral student will utilize historical air-photos, Landsat and Worldview satellite data, as well as several open-sourced digital analytical tools to reconstruct historical glacier extent and area, and model glacier Equilibrium Line Altitude (ELA). In combination with the related research which reconstructs long-term Holocene glacier histories using lake sediments in the same region, this complementary geospatial analysis will place 20th and 21th century glacier variability into a longer-term perspective. Although this research project will focus on alpine glaciers in South Greenland, it is highly relevant to understanding the impacts of global environmental change more broadly. The study aims to develop improved approaches for the historical analysis of glacial change, which will be useful for natural resource management in many other locations, including within the United States.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.