Developing a New Paleoclimate Proxy for Polar and Alpine Glacial Regions Based on Noble Gases

基于稀有气体为极地和高山冰川地区开发新的古气候代理

• 批准号: 1245580
• 负责人: M. Clara Castro
• 金额: $ 27.12万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-11-01 至 2016-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1245580&HistoricalAwards=false
• 关键词: Developing; New; Paleoclimate; Proxy; Polar

Intellectual Merit: Noble gases in groundwater systems can indicate past climates in ice-free regions through estimation of noble gas temperatures. Traditional noble gas temperatures cannot be derived in ice-covered regions where water is not in contact with the atmosphere. The goal of the proposed work is to take advantage of noble gas properties in ice covered lakes at the ice/water interface to develop a new paleoclimate proxy with the potential to be routinely used in both polar and alpine glacial regions. The evolution of the Taylor Valley lakes is intimately connected to the dynamics of nearby glaciers, as well as the advance and retreat of the Ross Ice Shelf, both of which are dictated by climate change. The perennial ice cover of the lakes form at the water/ice interface and sublimate at the top rendering these lakes ideal to test and develop this new proxy. The proposed research involves conducting an extensive noble gas sampling campaign of lake water, stream water, ice covers and glacial ice. This data set, together with data continuously collected in the area will provide a solid basis to develop, test and refine mathematical models capable of accurately describing heavy noble gas concentration profiles as well as their overall inventory in the lakes over time. These will provide information on the occurrence of major climatic events while simultaneously providing temporal constraints on such events. Broader impacts: The findings of this work will be inserted into a new class that the PI has created at the University of Michigan targeted at non-science majors. It will create research opportunities for 1-2 undergraduates each year and will support a PhD student. The outcomes of this research could have strong societal relevance.

智力优点：地下水系统中的贵重气体可以通过估计高贵的气体温度来表明无冰区域的气候。传统的贵重气温不能在没有与大气接触的冰覆盖区域中得出。拟议的工作的目的是利用冰/水界面冰覆盖的湖泊中的崇高气体特性，以开发新的古气候代理，并有可能在极性和高山冰川区域中定期使用。泰勒河谷湖泊的演变与附近冰川的动态以及罗斯冰架的前进和撤退密切相关，这两者都取决于气候变化。湖泊的多年生冰盖在水/冰界面处形成，并在顶部升华，这些湖泊理想地测试和开发了这种新的代理。拟议的研究涉及开展广泛的贵族气体采样活动，湖水，溪流，冰盖和冰川冰。该数据集以及在该地区连续收集的数据将为开发，测试和完善数学模型提供可靠的基础，能够准确地描述较重的贵重气体浓度概况以及随着时间的推移在湖泊中的整体库存。这些将提供有关重大气候事件发生的信息，同时在此类事件上提供时间限制。更广泛的影响：这项工作的发现将插入PI在密歇根大学以非科学专业为目标的新班级。它将为每年1-2的大学生创造研究机会，并支持博士生。这项研究的结果可能具有很强的社会意义。