Collaborative Research: Millennial Scale Arctic Climate Change for the last 3.6 My: Scientific Drilling at Lake El'gygytgyn, NE Russia

合作研究：过去 3.6 年的千年规模北极气候变化 我的：俄罗斯东北部 Elgygytgyn 湖的科学钻探

• 批准号: 0602308
• 负责人: Steven Forman
• 金额: $ 5.32万
• 依托单位: University of Illinois at Chicago
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-15 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0602308&HistoricalAwards=false
• 关键词: Collaborative; Research; Millennial; Scale; Arctic

The sedimentary record of Lake El'gygytgyn, an impact crater in northeastern Siberia, has become a focus for paleoclimatic research and is now considered a high-priority, world-class target for drilling by the International Continental Drilling Program (ICDP). Sediment cores retrieved from the deepest part of the lake (170 m) in 1998 and 2003 revealed a basal age of ~ 250 and nearly 300 ka, and reproducibly demonstrated the sensitivity of the lake to climatic change across NE Asia at millennial timescales. These cores are the oldest terrestrial Arctic cores yet retrieved. This grant will support acquiring deeper cores in spring 2008 through to bedrock. The cores could potentially yield a record of Arctic climate dating back to over 3 My ago. Seismic measurements show 400 m of sediments overlying the impact breccias. This grant is the U.S. contribution to a multi-national effort to retrieve the cores and carry out subsequent scientific research, joining contributions from the ICDP, the Canadian, German and Russian governments.Intellectual merit: The goal is to collect and interpret the longest time-continuous record of climate change in the terrestrial Arctic and compare this record with those from lower latitude marine and terrestrial sites to better understand hemispheric and global climate change. Coring objectives include 2 replicate overlapping cores at 2 sites near the deepest part of the lake. One additional land-based core on lake sediments now overlain by frozen alluvial sediments will allow a better understanding of sediment supply to the lake. These cores will provide a unique Arctic record capturing the mechanisms and dynamics of glacial/interglacial and millennial-scale change for comparison with other long records from the oceans. This will allow scientists to evaluate and model systemic teleconnections and leads/lags relative to insolation forcing during periods of both 41 ka and 100 ka cycling. This record will provide insight as to whether rapid change events identified during the last glacial cycle are typical of earlier glacial periods. This core will allow us to address questions concerning the evolution and mode of Arctic climate change via the transition from the warm middle Pliocene to the onset of the first major Northern Hemisphere glaciation. The cores will provide a record of the regional sensitivity of the N E Asian Arctic to millennial-scale abrupt change and interglacial warmth detected in the timeframe of the EPICA ice cores, long Asian loess and lake records, and marine records.Broader impacts: This work will help us understand the background of natural variations in Arctic climate so that modern changes can be understood within that context. As this work will occur during the International Polar Year (IPY), the retrieval of a unique Arctic core will be especially timely. International sharing of research builds trust and mutual respect between our nations and individuals, but also between political bodies and institutions in Moscow and the more remote regions of Russia. This proposal will support graduate and undergraduates at 4 U.S. institutions. A large portion of the outreach efforts will be internet-based, incorporating the latest interactive 3D GIS and terrain visualization technology, video, and real-time interactions with educators in the field, all tying this project into the IPY.

西伯利亚东北部的撞击火山口湖埃及湖湖的沉积记录已成为古气候研究的重点，现在被认为是国际大陆钻探计划（ICDP）的高优先级，世界一流的钻探目标。从1998年和2003年，从湖中最深的部分（170 m）检索到的沉积物岩心显示了〜250的基础年龄，近300 ka，可重复证明湖中湖中千禧年时标的NE亚洲气候变化的敏感性。这些岩心是尚未检索的最古老的陆地北极核心。该赠款将支持2008年春季至基岩的更深层核心。这些核心可能会产生北极气候的记录，可追溯到我的AOGO以上。地震测量表明，有400 m的沉积物覆盖了撞击角砾岩。这项赠款是美国对跨国努力的贡献，以检索核心并进行随后的科学研究，加入ICDP，加拿大，德国和俄罗斯政府的贡献。智能优点：目的是收集和解释与陆地上的较长的较低的潮流和较低段落的较长的记录，从而使较低的较低的段落和较低的段落相提并论，并将其与较低的段落相提并论，并与较低的latires clotiment和terristion相提并论。 改变。加芯目标包括在湖泊最深处的2个地点上的2个重复重叠的核心。现在，湖泊沉积物上的另一个陆基核心被冷冻冲积沉积物覆盖，可以更好地了解湖泊的沉积物供应。这些核心将提供独特的北极记录，以捕获冰川/冰川间和千禧一代变化的机制和动力学，以与海洋的其他长期记录进行比较。这将允许科学家在41 ka和100 ka循环期间评估和建模相对于在41 ka和100 ka循环期间的沉积强迫的系统性远程连接和延迟/滞后。该记录将提供有关在上一个冰川周期中确定的快速变化事件是否典型的早期冰川时期的洞察力。该核心将使我们能够通过从温暖的上新世过渡到第一个主要北半球冰川的发作，以解决有关北极气候变化的演变和模式的问题。这些核心将提供记录亚洲北极对千禧一代突然变化和冰川间温暖的区域敏感性，在Epica Ice核心的时间范围内发现，长期的亚洲冰丝和湖泊记录以及海洋记录。BROADS.BROADS.BROADERS：这项工作将帮助我们理解自然变化的现代风险，因此可以理解现代的情况。由于这项工作将在国际极性年（IPY）期间进行，因此取回独特的北极核心将特别及时。国际研究的共享建立了我们的国家和个人之间的信任和相互尊重，以及莫斯科和俄罗斯更偏远地区的政治机构和机构之间的信任和尊重。该提案将支持美国4个机构的毕业生和大学生。大部分外展工作将基于Internet，结合了最新的交互式3D GIS和地形可视化技术，视频和与该领域的教育工作者的实时互动，所有这些都将该项目纳入了IPY。