Testing an abrupt onset of the Little Ice Age

测试小冰河时代的突然开始

基本信息

批准号：
1821968
负责人：
Gifford Miller
金额：
$ 8.5万
依托单位：
University of Colorado at Boulder
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-06-01 至 2021-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1821968&HistoricalAwards=false
关键词：
Testing abrupt onset Little Ice

项目摘要

The investigator will collect vegetation exposed along the margins of receding glaciers on Baffin Island, Canada and use radiocarbon dating to determine when it was frozen as glaciers advanced during the Little Ice Age. Samples from the same sites collected in 2005 suggest that ice may have expanded following volcanic activity. This study will address hypotheses about the rate of cooling by combining the distance of ice retreat since 2005 and difference in age of the mosses. A graduate student will participate in field work and prepare results of radiocarbon dating for publication.The goal of this project is to examine the rate of onset of persistent Little Ice Age (LIA) cold by dating 50 new samples from current ice margins from ice complexes in Baffin Island, Canada, and comparing them to similar collections from 2005. If LIA ice expansion was abrupt and persistent then dates on the new plants should be about the same age as the 2005 samples, 200 to 500 m distant. Whereas if summers slowly cooled over decades-to-centuries through the late Holocene, then the new dates will be significantly older than their 2005 counterparts. Collectively, these data will provide the most robust testing of an abrupt onset of LIA cold and will be of interest to the sea ice and climate modeling communities.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

研究人员将收集沿加拿大巴芬岛上冰川冰川的边缘暴露的植被，并使用放射性碳约会来确定何时将其冷冻，因为冰川在小冰河时代升级时散发出来。 2005年收集的同一地点的样品表明，火山活动后冰可能已经扩大。这项研究将通过结合2005年以来的冰撤退距离和苔藓的年龄差异来解决关于冷却速率的假设。一名研究生将参加现场工作并准备出版的放射性碳预期结果。该项目的目的是通过在当前来自Baffin Island，加拿大Baffin Island的ICE Complextes的50个新样本的日期来检查持续的小冰河时代（LIA）冷的速度，并将其与2005年的相似植物进行比较。样品，距离200至500 m。如果夏季通过全新世晚期慢慢冷却了几十年，那么新的日期将比其2005年的同行大得多。总的来说，这些数据将提供对LIA COLD突然发作的最强大测试，并将吸引海冰和气候建模社区。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的审查标准来评估的支持。