Tephrochronology of the WAIS Divide Ice Core: Linking Ice Cores through Volcanic Records

WAIS 分水岭冰芯的年代学：通过火山记录将冰芯联系起来

• 批准号: 1142115
• 负责人: Nelia Dunbar
• 金额: $ 16.75万
• 依托单位: New Mexico Institute of Mining and Technology
• 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: 2012-07-01 至 2017-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1142115&HistoricalAwards=false
• 关键词: Tephrochronology; WAIS; Divide; Ice; Core

Dunbar/1142115This award supports a project to investigate the extremely rich volcanic record in the WAIS Divide ice core as part of this ongoing tephrochronology research in Antarctica. Ice cores in Polar Regions offer unparalleled records of earth's climate over the past 500,000 years. Accurate chronology of individual ice cores and chronological correlations between different ice cores is critically important to the interpretation of the climate record. The field of Antarctic tephrochronology has been progressing steadily, and is on the cusp of having a fully integrated tephra framework for large parts of the continent. Major advances in this field have been made due to the acquisition of a number of ice cores with strong volcanic records, improvement of analytical techniques and better characterization of source eruptions due in part to through studies of englacial tephra from several major blue ice areas. The intellectual merit of this work is that the tephrochonological studies will provide independently dated time-stratigraphic markers in the ice core, particularly for the deepest ice, linking tephra layers between the WAIS Divide core and the Siple Dome core which will allow detailed comparisons to be made of coastal and inland climate. It will also contribute to a better understanding of eruption magnitude, dispersal patterns and geochemical evolution of West Antarctic volcanoes. The work will also contribute to a new tephra dataset to the literature for use in future ice core studies. The broader impacts of this project fall into the areas of education, outreach and international cooperation. This project will employ one New Mexico Tech graduate student, but will also be featured in outreach programs for NMT undergraduates, as well as teacher and student groups and outreach for the general public in New Mexico. NMT is an Hispanic serving institution (25% Hispanic students) and also found by NSF to rank 15th nationwide in "baccalaureate-origin" institutions for doctoral recipients in science and engineering, thereby having a disproportionately large effect on producing Hispanic scientists and engineers. However, probably the most significant broader impact of this project will be the continued efforts of the PI in fostering and promoting of international cooperation in the tephra-in-ice community. Dunbar has been collaborating with European tephra researchers for a number of years, sharing data and working collaboratively on tephra correlations, and these activities have lead to, and will continue to promote, forward progress in integrating the Antarctic tephrochronology record. This proposal does not require field work in the Antarctic.

Dunbar/1142115此奖项支持一个项目，旨在调查WAIS Divide Ice Core的极富富裕火山记录，这是南极洲正在进行的Tephroanology Research的一部分。 在过去的500，000年中，极地地区的冰芯提供了地球气候无与伦比的记录。各个冰芯的准确年代和不同冰芯之间的年代相关性对于对气候记录的解释至关重要。南极tephroanology的领域一直在稳步发展，并且正是在大陆大部分地区拥有完全集成的tephra框架。由于采集了许多具有强大火山记录的冰芯，分析技术的改进以及更好地表征来自几个主要蓝色蓝冰区域的英语tephra，因此该领域的重大进展已取得了重大进展。 这项工作的智力优点在于，tephrohonologology研究将在冰芯中提供独立的日期时间间隙标记，尤其是对于最深的冰层，将Wais Divide Core和Siple Dome Core之间的Tephra层连接起来，这将允许详细的比较沿海和内地气候。 它还将有助于更好地理解南极火山的喷发幅度，分散模式和地球化学演化。这项工作还将为文献中的新的Tephra数据集做出贡献，以在未来的ICE核心研究中使用。 该项目的更广泛影响属于教育，外展和国际合作领域。该项目将聘请一名新墨西哥理工学院的研究生，但也将在NMT本科生以及新墨西哥州的普通公众的宣传计划中介绍。 NMT是一家西班牙裔服务机构（25％的西班牙裔学生），也是NSF在全国范围内在“学士学位 - 奥里金（Origin）”中为科学和工程学的博士获得者中的第15位排名，从而对生产西班牙裔科学家和工程师产生不成比例的影响。但是，该项目可能最大的广泛影响将是PI在促进和促进Tephra-Ice社区的国际合作方面的持续努力。邓巴（Dunbar）多年来一直与欧洲的泰弗拉（Tephra）研究人员合作，共享数据并在Tephra相关性上进行合作，这些活动已导致并将继续促进，并将在整合南极Tephrosonology Record的整合方面都在促进进步。该建议不需要南极的现场工作。