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Testing an abrupt onset of the Little Ice Age

Testing an abrupt onset of the Little Ice Age
测试小冰河时代的突然开始
批准号:
1821968
负责人:
Gifford Miller
金额:
$8.5万
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
项目状态:
已结题
起止时间:
2018-06-01 至 2021-05-31

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中文摘要
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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.
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Collaborative Research: Toward placing contemporary Arctic summer warming in a millennial perspective with a pan-Arctic record of Neoglacial crysophere expansion
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    2100381
  • 项目类别:
    Standard Grant
  • 资助金额:
    $6.27万
  • 财政年份:
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  • 负责人:
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  • 依托单位:
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  • 项目类别:
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    $27.5万
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Integrating novel molecular techniques to disentangle the roles of climate, time, and human agency on the evolution of the Icelandic landscape
  • 批准号:
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  • 资助金额:
    $93.5万
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    2019
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Collaborative Research: Ecosystem Response to a Warming Arctic: Deciphering the Past to Inform The Future.
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    1737712
  • 项目类别:
    Standard Grant
  • 资助金额:
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