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该奖项支持一个项目，调查WAIS分水岭冰芯中极其丰富的火山记录，作为南极洲正在进行的火山灰年代学研究的一部分。 极地地区的冰芯提供了过去50万年来地球气候的无与伦比的记录。准确的冰芯年代学和不同冰芯之间的年代学相关性对于解释气候记录至关重要。南极火山灰年代学领域一直在稳步发展，并即将为该大陆的大部分地区建立一个完全整合的火山灰框架。在这一领域取得了重大进展，这是由于获得了一些具有强烈火山记录的冰芯，分析技术的改进以及对来源喷发的更好描述，部分原因是通过对几个主要蓝冰区的冰内火山灰的研究。 这项工作的智力价值是，火山灰研究将提供独立的时间地层标记的冰芯，特别是最深的冰，连接火山灰层之间的WAIS分水岭核心和Siple圆顶核心，这将允许详细比较沿海和内陆气候。 它还将有助于更好地了解西南极火山的喷发规模、扩散模式和地球化学演变。这项工作也将有助于一个新的火山灰数据集的文献，用于未来的冰芯研究。 该项目的广泛影响涉及教育、外联和国际合作领域。该项目将雇用一名新墨西哥州技术研究生，但也将在NMT本科生的推广计划，以及教师和学生团体和推广为一般公众在新墨西哥州的特色。NMT是一个西班牙裔服务机构（25%的西班牙裔学生），也被NSF发现在全国范围内排名第15位的“学士学位起源”机构的博士生在科学和工程，从而产生西班牙裔科学家和工程师的不成比例的大影响。然而，该项目最重要的影响可能是PI在促进和促进冰中火山灰社区国际合作方面的持续努力。邓巴多年来一直与欧洲火山灰研究人员合作，分享数据并就火山灰相关性进行合作，这些活动已经导致并将继续促进南极火山灰年代学记录的整合。这项提议不需要在南极进行实地工作。