Collaborative Research: Long Term Sublimation/Preservation of Two Separate, Buried Glacier Ice Masses, Ong Valley, Southern Transantarctic Mountains

合作研究：跨南极山脉南部翁谷两个独立的埋藏冰川冰块的​​长期升华/保存

• 批准号: 1445205
• 负责人: Jaakko Putkonen
• 金额: $ 27.12万
• 依托单位: University of North Dakota Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-11-01 至 2022-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1445205&HistoricalAwards=false
• 关键词: Collaborative; Research; Long; Term; Sublimation

Putkonen/1445205This award supports the study of a large body of ice that is buried beneath approximately a meter of debris in the Ong Valley of the Transantarctic Mountains of East Antarctica. Preliminary analyses of this material suggest that it could be over a million years old. Most glacial ice contains tiny air bubbles that have trapped the atmospheric gases and other atmospherically transported materials existing at the time that the ice was deposited such as plant pollen, microbes and mineral dust. Samples will be collected from this buried ice mass, down to a depth of 10 meters, and cosmogenic nuclide concentrations both in the overlying debris and in the till contained in the ice will be measured. This site could contain some of the oldest ice on Earth and studies of the material contained within it may help researchers to better understand the processes involved in its survival for such long periods of time. This work will also help inform scientists about the processes involved in the development of landforms here on earth as well as those on Mars where similar dirt covered glaciers are found today.Samples of the buried ice will be collected in Ong Valley and analyzed to determine the cosmogenic nuclide concentrations in both the overlying debris and in the mineral matter suspended in the ice. The combined analysis of the target cosmogenic nuclides (Beryllium-10, Aluminum-26, and Neon-21) will allow the age of the ice to be uniquely determined and will enable determination of the rate that the ice is sublimating. The intellectual merit of this research is to unequivocally determine the age of the ice and the sublimation rate of the ice in Ong Valley, Antarctica and to better understand if this an uniquely Antarctic process or whether it could exist elsewhere on earth or on other planets. The work may also lead to the recognition of the oldest buried ice ever found on Earth and would provide a source from which direct information about the atmospheric chemistry, ancient life forms, and geology of that time could be measured. The broader impacts of this work are that it will be relevant to researchers in a number of different fields including glaciology, paleoclimatology, planetary geology, and biology. Several students will also participate in the project, conducting Antarctic field work, making measurements in the lab, attending meetings, participating in outreach activities, and producing videos. A graduate student will also write a thesis on this research. The results will be published in scientific journals and presented at conferences. The project requires field work in Antarctica.

这个奖项支持对埋在南极洲东部横越南极山脉的翁山谷中大约一米厚的碎片下的一大块冰体的研究。对这种物质的初步分析表明，它可能有一百多万年的历史。大多数冰川冰含有微小的气泡，这些气泡将大气气体和其他在冰沉积时存在的大气运输物质（如植物花粉、微生物和矿物粉尘）困住。将从埋在地下10米深处的冰块中收集样本，并测量上面的碎片和冰块中含有的宇宙核素浓度。这个地点可能包含地球上一些最古老的冰，对其中所含物质的研究可能有助于研究人员更好地了解它在如此长时间内存活的过程。这项工作还将帮助科学家了解地球上地貌的发展过程，以及今天在火星上发现的类似的被泥土覆盖的冰川。埋藏冰的样本将在Ong Valley收集，并进行分析，以确定上覆碎片和悬浮在冰中的矿物质中的宇宙核素浓度。对目标宇宙形成核素（铍-10，铝-26和氖-21）的综合分析将使冰的年龄得到唯一的确定，并将使冰升华的速度得到确定。这项研究的智力价值在于明确地确定南极翁谷冰的年龄和冰的升华率，并更好地了解这是南极独有的过程，还是它可能存在于地球或其他行星的其他地方。这项工作还可能使人们认识到地球上发现的最古老的埋藏冰，并将为测量当时的大气化学、古代生命形式和地质提供直接信息的来源。这项工作的更广泛的影响是，它将与许多不同领域的研究人员相关，包括冰川学、古气候学、行星地质学和生物学。几名学生也将参与该项目，进行南极实地考察，在实验室进行测量，参加会议，参加外展活动，并制作视频。研究生也将写一篇关于这项研究的论文。研究结果将发表在科学期刊上，并在会议上发表。这个项目需要在南极洲进行实地工作。