RII Track-4: NSF: Building Linkages: Assessing the Importance of Terrestrial Climate in Deglacial Ice Sheet Dynamics through Collaborative Research Capacity Building

RII Track-4：NSF：建立联系：通过合作研究能力建设评估陆地气候在冰消冰盖动力学中的重要性

• 批准号: 2229696
• 负责人: Simon Pendleton
• 金额: $ 13.9万
• 依托单位: Plymouth State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-01-15 至 2024-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2229696&HistoricalAwards=false
• 关键词: RII; Track; NSF; Building; Linkages

As the world’s climate continues to warm, it is increasingly important to understand how the melting Greenland and Antarctic ice sheets will contribute to sea level rise. Specifically, as the ice sheets retreat over land, it becomes imperative to understand the role local climate has on the melting of ice sheet margins. Thus, the goals of this project are threefold. Initially, the researcher will reconstruct records of past climate (temperature and precipitation) in New England. The reconstructed past climate will be from approximately 13,000 years ago when a large ice sheet was retreating under analogous warming conditions. To accomplish this, the research team will analyze organic molecules from plants and bacteria left behind in lake sediments and whose form and composition reflect past changes in temperature and precipitation. Second, the PI will compare these new high-resolution climate records to existing records of changes in ice sheet margin activity to elucidate the role of local climate on the melting and retreat of large ice sheets. Understanding how local climate impacted the melting of past ice sheets will help forecast how continued climate change will drive melting of the Greenland and Antarctic ice sheets. Better understanding and predictions of melting ice sheet contributions to sea level rise are vital in helping coastal areas worldwide to prepare for and mitigate associated consequences. The third and final goal of the project includes capacity building at a small rural institution and research experience for undergraduate students, helping to prepare the next generation of earth and climate scientists.This Research Infrastructure Improvement Track-4 EPSCoR Research Fellows (RII Track-4:NSF) project would provide a fellowship to a Teaching Faculty member and training for an undergraduate student at Plymouth State University. This work would be conducted in collaboration with researchers at the University of Colorado Boulder. The world's ice sheets are projected to continue to shrink under future warming conditions, with potentially wide-ranging and catastrophic global consequences. However, the role of terrestrial climate change on ice sheet fluctuations, especially during times of ice margin retreat, remains poorly understood. While changes in ice sheet mass balance and ice dynamics are known to drive ice-margin fluctuations on millennial to multi-millennial timescales, it is hypothesized that more local, terrestrial climate plays a significant role in shorter timescale ice margin fluctuations. A better understanding of the impact of local climate on past ice margin behavior is necessary to understand how modern ice sheet margins will respond to continued climate change. The researcher will pilot the generation of new, high-resolution temperature and hydroclimate records following the deglaciation of the northeastern United States by the Laurentide Ice Sheet following the Last Glacial Maximum. Temperature and hydroclimate will be reconstructed using branched glycerol dialkyl glycerol tetraethers (brGDGTs) and the hydrogen isotopic composition (δ2H) of precipitation from preserved leaf waxes, respectively, using sediment cores (in-hand and to-be-collected) from central New England. The researcher will accomplish this through extended visits to two laboratory facilities at the University of Colorado Boulder and in collaboration with their PIs and staff. These new records will be compared to the existing North American Varve Chronology which contains a detailed record of LIS retreat and ice margin fluctuations through the study area.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.

随着世界的气候继续变暖，了解融化的格陵兰和南极冰盖将如何促进海平面上升，这一点越来越重要。具体而言，随着冰盖在陆地上的撤退，必须了解当地气候在冰片边缘融化中的作用。那，该项目的目标是三倍。最初，研究人员将重建新英格兰过去气候（温度和降水）的记录。重建的过去气候将来自大约13，000年前，当时大型冰盖在类似的变暖条件下撤退。为此，研究小组将分析湖中留下的植物和细菌的有机分子，其形式和组成反映了过去温度和降水的过去变化。其次，PI将将这些新的高分辨率气候记录与现有的冰盖边缘活动变化记录进行比较，以阐明当地气候在大型冰盖的融化和撤退中的作用。了解当地气候如何影响过去的冰盖融化将有助于预测持续的气候变化将如何推动格陵兰和南极冰盖的融化。更好地理解和预测融化冰盖对海平面上升的贡献对于帮助全球沿海地区做准备和减轻相关后果至关重要。该项目的第三个也是最终目标包括在一个小型农村机构和本科生的研究经验上建设能力，帮助准备下一代地球和气候科学家。本研究基础设施改进轨道-4 EPSCOR研究Fellows（RII Track-4：NSF）项目将为教职员工成员和培训教职员工和培训培训的州立大学学生和培训。这项工作将与科罗拉多大学博尔德大学的研究人员合作进行。预计世界的冰盖将在未来的变暖条件下继续缩小，并带来巨大的范围和灾难性的全球后果。然而，陆地气候变化在冰片波动中的作用，尤其是在冰缘撤退时期，人们对冰片的波动的了解仍然很少。虽然已知冰板质量平衡和冰动力学的变化会驱动千禧一代到多千年时间尺度上的冰块波动的波动，但假设更多局部的陆地气候在较短的时间表冰缘波动中起着重要作用。需要更好地理解当地气候对过去的冰缘行为的影响，以了解现代冰纸利润率将如何应对持续的气候变化。研究人员将在最后一次冰川最大值之后通过劳伦德赛冰盖脱胶后，在美国东北部的脱水后，导致新的高分辨率温度和氢化气候记录的产生。温度和氢化气候将分别使用固定叶蜡的沉淀物分别使用分别的氢同位素组成（Δ2H）重建，并使用新英格兰中部的沉积物核（In Hand and and to-Be Collesed）对固定叶蜡的沉淀分别重建。研究人员将通过对科罗拉多大学博尔德大学的两个实验室设施进行扩展访问，并与他们的PIS和员工合作来实现这一目标。将将这些新记录与现有的北美Varve年表进行比较，该记录包含通过研究区域的LIS撤退和冰缘波动的详细记录。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子优点和更广泛的影响审查标准通过评估来获得的支持。