Collaborative Research: Ice Core Studies Reconstructing Greenland Climate During the Eemian and Beyond

合作研究：冰芯研究重建峨眉纪及以后的格陵兰气候

• 批准号: 1107343
• 负责人: Michael Bender
• 金额: $ 29.56万
• 依托单位: Princeton University
• 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: 2012-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1107343&HistoricalAwards=false
• 关键词: Collaborative; Research; Ice; Core; Studies

The primary goal of this collaborative project between three institutions is to understand the extent and evolution of the Greenland Ice Sheet (GIS) during the Eemian period (roughly 130,000 to 115,000 years ago, the last major interglacial period in Earth's history) and the deglaciation immediately preceding it ("Termination 2"). The GIS is an important agent influencing sea level, and Arctic and global climate, on multiple timescales. Its dynamics need to be understood in the context of past climate changes, but there is little information available about the footprint, volume, and elevation of the GIS prior to the last ice age due to the absence of continuous ice core records prior to 123,000 years ago. During the Eemian, the GIS was perhaps half its present size, contributing on the order of 3 m to "excess" sea level rise. Characterizing the evolution of the GIS during glacial termination 2 and the Eemian would improve our understanding of its dynamics, and enhance our ability to make projections of sea level rise during the coming centuries. Older ice does exist at the bottoms of previously drilled ice cores, but the extraction of age and climate information from this older ice is hampered by the fact that it is stratigraphically disturbed and, in many cases, contaminated with soil or bedrock material. These investigators propose several novel methods to date this disturbed and/or "dirty" ice and to extract information on climate and ice sheet extent. The investigators will combine their new measurements and other available data to develop a more complete history of the GIS during termination 2 and the Eemian. They will work with ice sheet modelers to investigate the constraints that the Eemian data provide for the models and improve their predictive capability. These efforts have the potential to improve our ability to predict the contribution of the GIS to sea-level rise in the coming decades to centuries. Educational and outreach activities include the training of two graduate students, inclusion of this research in summer teacher enrichment programs, a lecture series for graduate students and postdocs, and communication of the results through the news media.

这三个机构之间的合作项目的主要目标是了解在EEMIAN时期格陵兰冰盖（GIS）的程度和演变（大约130,000至115，000年前，是地球历史上最后一个主要的冰河间时期）和脱气的次数（即“终止2”）。 GIS是影响海平面，北极和全球气候在多个时间尺度上的重要代理。在过去的气候变化的背景下，需要理解其动态，但是由于123，000年前之前没有连续的冰核记录，因此几乎没有关于GIS之前GIS的足迹，数量和高程的信息。在EEMIAN期间，GIS可能是目前的一半，以3 m的命令促成“过度”海平面上升。表征GIS在冰川终止2和EEMIAN期间的GIS的演变将提高我们对其动态的理解，并增强我们在未来几个世纪的海平面上升的能力。较旧的冰确实存在于先前钻孔的冰芯的底部，但是从该较旧冰中提取的年龄和气候信息受到了地层干扰，并且在许多情况下被土壤或基岩材料污染的事实受到了阻碍。这些研究者提出了几种新颖的方法，以确定这种干扰和/或“脏”冰，并提取有关气候和冰盖范围的信息。研究人员将结合他们的新测量结果和其他可用数据，以在终止2和EEMIAN期间开发更完整的GIS历史。他们将与冰盖建模者一起研究EEMIAN数据为模型提供的约束并提高其预测能力。这些努力有可能提高我们预测GIS在未来几十年到几个世纪中对海平面上升的贡献的能力。教育和外展活动包括对两名研究生进行培训，将这项研究包括在夏季教师丰富计划中，为研究生和博士后提供的演讲系列以及通过新闻媒体进行结果的沟通。