Collaborative Research: Assessing the Antarctic Contribution to Sea-level Changes during the Last Deglaciation: Constraints from Darwin Glacier

霍尔/1246170该奖项支持一个项目，该项目通过详细的冰川测绘和南极达尔文-哈瑟顿冰川地区冰雹的测年(使用以前冰缘池塘的藻类的14C日期和10Be表面暴露年龄)来重建过去的冰面海拔，以试图解决目前对该地区冰川历史存在的非常不同的解释。研究结果将与现有的气候和地球物理数据结合到一个流线模型中，以深入了解南极洲冰川对气候和冰动力学扰动的响应。这项工作将有助于更好地了解LGM冰层厚度，以及是否有任何证据表明南极洲促成了融水脉冲(MWP-1A)，这是南极冰川地质学中一个非常有争议的话题。这项工作的学术价值与这样一个事实有关，即重建南极冰盖(AIS)过去的波动对于理解冰量对海平面和气候变化的敏感性至关重要。对过去行为的限制有助于将正在进行的变化纳入背景，并为预测未来海平面上升提供基础。更广泛的影响包括支持两名研究生和两名本科生，以及一名女性职业早期调查员。研究生将参与该项目的所有阶段，从规划和实地测绘到地质年代学分析、解释、综合和报告。两名本科生将从事该项目的实验室研究。该项目还将包括访问K-12教室，讨论冰川和气候变化，与外地教师和学生通信，以及基于网络的外联。这一奖项在南极洲进行了实地考察。

Hall/1246170This award supports a project to reconstruct past ice-surface elevations from detailed glacial mapping and dating of moraines (using 14C dates of algae from former ice-marginal ponds and 10Be surface exposure ages) in the region of the Darwin-Hatherton Glaciers in Antarctica in order to try and resolve very different interpretations that currently exist about the glacial history in the region. The results will be integrated with existing climate and geophysical data into a flow-line model to gain insight into glacier response to climate and ice-dynamics perturbations during the Late Glacial Maximum (LGM) in Antarctica. The work will contribute to a better understanding of both LGM ice thickness and whether or not there is any evidence that Antarctica contributed to Meltwater Pulse (MWP)-1A a very controversial topic in Antarctic glacial geology. The intellectual merit of the work relates to the fact that reconstructing past fluctuations of the Antarctic Ice Sheet (AIS) is critical for understanding the sensitivity of ice volume to sea-level and climatic change. Constraints on past behavior help put ongoing changes into context and provide a basis for predicting future sea-level rise. Broader impacts include the support of two graduate and two undergraduate students, as well as a female early-career investigator. Graduate students will be involved in all stages of the project from planning and field mapping to geochronological analyses, interpretation, synthesis and reporting. Two undergraduates will work on lab-based research from the project. The project also will include visits to K-12 classrooms to talk about glaciers and climate change, correspondence with teachers and students from the field, and web-based outreach. This award has field work in Antarctica.