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

邓巴/1142115该奖项支持一项研究WAIS分水岭冰芯中极其丰富的火山记录的项目，该项目是正在进行的南极洲温度年代学研究的一部分。极地地区的冰芯提供了过去50万年地球气候的无与伦比的记录。单个冰芯的准确年代学和不同冰芯之间的年代学相关性对气候记录的解释至关重要。南极温度年代学领域一直在稳步取得进展，并即将为该大陆的大部分地区建立一个完全综合的温度框架。这一领域的重大进展是由于获得了一些具有强烈火山记录的冰芯，改进了分析技术，并更好地描述了源喷发，部分原因是通过对几个主要蓝冰区的冰川冰的研究。这项工作的知识价值在于，温度学研究将在冰芯中提供独立的年代-地层标记，特别是对于最深的冰，将WAIS Divide核心和简单圆顶核心之间的温度层联系起来，这将允许对沿海和内陆气候进行详细的比较。它还将有助于更好地了解南极西部火山的喷发规模、扩散模式和地球化学演化。这项工作还将为未来冰芯研究的文献提供一个新的tephra数据集。该项目的广泛影响涉及教育、外联和国际合作等领域。该项目将雇用一名新墨西哥理工学院的研究生，但也将在面向新墨西哥理工学院本科生、教师和学生团体以及面向普通公众的推广项目中发挥重要作用。NMT是一所为西班牙裔服务的大学（25%的学生是西班牙裔），在美国国家科学基金会（NSF）的科学和工程博士学位培养机构中，NMT在全国排名第15位，因此在培养西班牙裔科学家和工程师方面产生了不成比例的巨大影响。不过，这一项目最重要的广泛影响可能是PI继续努力促进和促进冰中燕界的国际合作。邓巴多年来一直与欧洲麻风研究人员合作，分享数据，共同研究麻风的相关性，这些活动已经并将继续促进整合南极麻风年代学记录的进展。这项建议不需要在南极进行实地工作。

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.