CAREER: The Last Glacial Termination in Interior Asia

职业生涯：亚洲内陆最后一次冰川消亡

• 批准号: 1554990
• 负责人: Aaron Putnam
• 金额: $ 47.33万
• 依托单位: University of Maine
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-05-01 至 2023-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1554990&HistoricalAwards=false
• 关键词: CAREER; Last; Glacial; Termination; Interior

The climate event that ended the last ice age - dubbed the "last glacial termination" - involved the greatest natural global warming of the recent geologic past. This was also the last time in which atmospheric CO2 rose by a substantial amount prior to the industrial period. The last glacial termination therefore represents a spectacular natural experiment played out by the Earth system that can be studied in order to decipher the underlying dynamics of the climate system and its sensitivity to forcing factors, such as atmospheric CO2. This project aims to determine when, and how rapidly, glaciers receded and the climate warmed at the end of the last ice age in the heart of Asia - Earth's largest and most populous continent. This research will help identify factors that produced this last great global warming, and to clarify the role of atmospheric CO2 in ice-age climate cycles. This work will provide immersive, field-based, and cooperative educational experiences for the next generation of scientists. The project will bring together a research team that includes underrepresented high-school students and STEM teachers from the South Side of Chicago, graduate and undergraduate students from the U.S.A., Mongolia, and China, and graduate students of science journalism. The overarching goal is to establish and nurture international and cross-cultural educational and scientific partnerships that are built to last well beyond the duration of this project.Identifying the causes of the last glacial termination is a major objective of the earth and climate sciences, and requires detailed chronologies of sensitive paleoclimate proxies that monitored the last glacial-to-interglacial transition across the planet. The purpose of this CAREER research is to develop such chronologies from the center of Asia for the reduction of mountain glacier extent from the peak of the last ice age to today's conditions. Glacier chronologies will be based on precise and accurate 10Be surface-exposure dating of glacial landforms in the mid-latitude Altai range of Mongolia and in the monsoonal eastern Himalaya of China. Glaciological modeling will convert these glacier reconstructions into records of glacier-inferred atmospheric temperature, which will in turn be compared with signatures of incoming solar radiation, greenhouse gases, as well as other proposed drivers, to discriminate among possible causes of the last termination. This project will be carried out following an integrated research and education plan that implements a cooperative, field-based learning strategy in which students at different levels learn by teaching each other. The collaborative, cross-cultural, multi-national, and multi-generational team will share knowledge and experiences in the field and throughout the scientific process. This team will consist of (1) graduate and undergraduate students from the University of Maine, (2) students and researchers from Mongolian and Chinese institutions, (3) students and science teachers from the Gary Comer College Preparatory school ? a public charter school devoted to improving the lives of underserved minority students from the South Side of Chicago, and (4) embedded science journalism graduate students from the Medill School of Journalism who will produce stories for publication and broadcast, thus documenting scientific outcomes for the public.

结束最后一个冰河时代的气候事件 - 被称为“最后的冰川终止” - 涉及最近地质过去的最大自然全球变暖。这也是工业时期之前大气二氧化碳大量升高的最后一次。 因此，最后的冰川终止代表了一个壮观的自然实验，可以研究地球系统，以破译气候系统的潜在动力学及其对强迫因子的敏感性，例如大气CO2。 该项目的目的是确定冰川何时以及何时速度，气候在亚洲中心最后一个冰河时代结束时变暖 - 地球最大，最人口的大陆。这项研究将有助于确定产生最后一次全球变暖的因素，并阐明大气二氧化碳在冰河气候周期中的作用。这项工作将为下一代科学家提供身临其境，基于现场和合作的教育经验。 该项目将汇集一个研究团队，其中包括芝加哥南侧的代表性不足的高中生和STEM老师，来自美国，蒙古和中国的研究生和本科生，以及科学新闻学的研究生。总体目标是建立和培育国际和跨文化的教育和科学伙伴关系，这些伙伴关系始终超出该项目的持续时间。识别最后一次冰川终止的原因是地球和气候科学的主要目标，并且需要详细的敏感古态式跨性沟通式旋转式跨度跨度的详细时间。这项职业研究的目的是从亚洲中心开发此类时间，以减少山地冰川范围从上一个冰河时代的高峰到当今的状况。冰川的时间顺序将基于蒙古中部纬度范围内以及中国季风东部喜马拉雅山脉中的冰川地面的精确和准确的10BE表面暴露年代。冰川模型将这些冰川重建转换为冰川加入的大气温度的记录，这反过来将与传入的太阳辐射，温室气体以及其他提议的驱动程序进行比较，以区分最后终止的可能原因。该项目将按照一项综合的研究和教育计划进行，该计划实现了一种合作，基于现场的学习策略，在该策略中，不同级别的学生通过相互教学来学习。 合作，跨文化，跨国和多代团队将在该领域以及整个科学过程中分享知识和经验。 该团队将由（1）缅因州大学的毕业生和本科生组成（2）蒙古和中国机构的学生和研究人员，（3）来自加里·科默大学预科学校的学生和科学老师？一所公立特许学校致力于改善芝加哥南侧服务不足的少数族裔学生的生活，以及（4）来自Medill新闻学院的嵌入式科学新闻学研究生，他们将为出版和广播提供故事，从而记录公众的科学成果。