Collaborative Research: Arctic Sensitivity to Climate Perturbations and a Millenial Perspective on Current Warming Derived from Shrinking Ice Caps

合作研究：北极对气候扰动的敏感性以及对冰盖缩小导致的当前变暖的千年视角

• 批准号: 1204005
• 负责人: Jason Briner
• 金额: $ 24.95万
• 依托单位: SUNY at Buffalo
• 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: 2012-09-01 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1204005&HistoricalAwards=false
• 关键词: Collaborative; Research; Arctic; Sensitivity; Climate

The goal of this proposal is to provide a millennial context for current warming and to better constrain the nature of abrupt climate changes over the past 5000 years in the North Atlantic sector of the Arctic. This goal will be addressed with the powerful datasets derived from radiocarbon-dated vegetation preserved beneath ice caps for centuries to millennia, but now being exposed annually by current ice-margin retreat across northeastern Canada and West Greenland. These chronologies define the pattern and timing of abrupt summer coolings in the recent past and place current warming in a millennial context. 14C dating of vegetation will be complemented by measuring in situ 14C inventories in recently exposed rock surfaces, providing essential temporal constraints on the duration of ice-covered and ice-free conditions throughout the Holocene. Combined, these two datasets will provide the most secure evidence for the character of current summer warming by explicitly dating when the region was last as warm as present. Comparing our climate reconstructions with on-going studies in NW Europe will help to separate the roles of unforced variability from hemispherically symmetric forcing as causes for abrupt climate change. Research activities under this award will be made accessible to indigenous peoples by translating the goals and eventual results into Inuktitut, through posters that describe the research, and by offering public lectures in Iqaluit, the capital of Nunavut, and at Qikiqtarjuaq, where INSTAAR has long had a presence. This research program will train a PhD and MSc student, and provides opportunities for undergraduate students to become involved with research, building on successful traditions from previous years.

该提案的目的是为当前的变暖提供千禧一代的背景，并更好地限制过去5000年中北极大西洋地区突然气候变化的性质。该目标将通过在冰盖下保存在冰盖下几个世纪的放射性植物的强大数据集来解决，但现在每年都会每年在加拿大东北部和西部格陵兰岛的当前冰块静修处暴露。这些时间顺序定义了最近的夏季冷却的模式和时机，并在千禧一代的情况下定义了当前的变暖。 14c植被的日期将通过在最近裸露的岩石表面的原位14C清单进行补充，从而在整个全新世对冰覆盖和无冰条件的持续时间提供了必不可少的时间限制。这两个数据集结合在一起，将为当前夏季变暖的特征提供最安全的证据，以明确的约会，当时该地区的最后一次温暖。将我们的气候重建与在欧洲西北持续的研究进行比较，将有助于将未强制性变异性的作用与半球形强迫的作用分为突然的气候变化的原因。 该奖项下的研究活动将通过描述研究的海报，并在Iqaluit，Nunavut的首都和Qikiqtarjuaq在Instaar长期拥有长期的Iqaluit，通过描述研究的海报，在Instaar的首都iqaluit提供公开演讲，使土著人民可以通过将目标和最终结果转化为Inuktitut，使土著人民能够获得研究活动。有一个存在。该研究计划将培训博士学位和MSC的学生，并为本科生提供参与研究的机会，并以往年的成功传统为基础。