Doctoral Dissertation Research: An Evaluation of Sedimentary Lipid Hydrogen Isotopes as an Arctic Precipitation Proxy

博士论文研究:沉积脂质氢同位素作为北极降水代理的评估

基本信息

  • 批准号:
    1634118
  • 负责人:
  • 金额:
    $ 1.6万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2016
  • 资助国家:
    美国
  • 起止时间:
    2016-09-01 至 2018-02-28
  • 项目状态:
    已结题

项目摘要

This doctoral dissertation research project will characterize the distribution and hydrogen isotopic composition of plant biomarkers in lake sediments and modern plants to reconstruct past hydroclimate environments in the Arctic. By inferring the isotopic composition of past precipitation patterns and lake waters, this research will facilitate better modeling of the impacts of environmental change on Arctic ecosystems. Improved reconstruction of past hydroclimates will provide a more comprehensive understanding of the Arctic's atmospheric circulation responses to amplified thermal configurations. The project promises a significant STEM education component led by three early-career women that includes the engagement of several undergraduate students in research activities. In addition, the doctoral student will work with the PI on workshops for K-12 STEM teachers from Chicago and Evanston public schools to incorporate current scientific information into their educational materials. As a Doctoral Dissertation Research Improvement award, this award will provide support to enable a promising student to establish a strong independent research career.Existing paleoclimate records provide unique perspectives on how climate related to the hydrologic cycle varied temporally over the Arctic. However, there presently are insufficient data samples and inadequately calibrated proxies to confidently assess changes in hydroclimate. To facilitate improved reconstructions of past hydroclimate environments, the doctoral student will develop new methodologies for characterizing the distributions and hydrogen isotopic values of modern lipids in lake sediments and modern plants along an extensive latitudinal and climatic transect. Gas chromatography and mass spectrometry will be used on lake sediments cores to derive a dataset of plant biomarkers and their correlates (alkanes and acids.) Sedimentary leaf wax and aquatic plant lipid hydrogen isotopes will be measured and used to infer source water hydrogen isotopes by applying a fractionation correction. By answering fundamental questions about the characterization of lipid biomarkers and the relationship between lipid biomarkers and source water, the research will advance the broader application of using hydrogen lipid biomarkers as a paleohydrologic proxy in sedimentary archives.
本博士论文研究项目将描述湖泊沉积物和现代植物中植物生物标志物的分布和氢同位素组成,以重建北极过去的水文气候环境。通过推断过去降水模式和湖水的同位素组成,本研究将有助于更好地模拟环境变化对北极生态系统的影响。对过去水文气候的改进重建将使我们更全面地了解北极大气环流对放大热配置的响应。该项目承诺由三名早期职业女性领导一个重要的STEM教育组成部分,其中包括几名本科生参与研究活动。此外,该博士生将与PI合作,为来自芝加哥和埃文斯顿公立学校的K-12 STEM教师举办研讨会,将当前的科学信息纳入他们的教材中。作为博士论文研究改进奖,该奖项将为有前途的学生提供支持,使他们能够建立强大的独立研究事业。现有的古气候记录提供了独特的视角来研究北极地区与水文循环有关的气候如何在时间上发生变化。然而,目前没有足够的数据样本和不充分校准的代理来自信地评估水文气候的变化。为了更好地重建过去的水文气候环境,博士生将开发新的方法来表征湖泊沉积物和现代植物中现代脂质的分布和氢同位素值,沿着广泛的纬度和气候样带。气相色谱法和质谱法将用于湖泊沉积物岩心,以获得植物生物标志物及其相关物(烷烃和酸)的数据集。将测量沉积叶蜡和水生植物脂质氢同位素,并通过应用分馏校正来推断源水氢同位素。通过对脂质生物标志物表征及脂质生物标志物与源水关系等基础性问题的解答,将推动氢质生物标志物作为古水文指标在沉积档案中的广泛应用。

项目成果

期刊论文数量(0)
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Yarrow Axford其他文献

Evaluating middle to late Holocene climate variability from δsup18/supO of aquatic invertebrate remains in southwestern Greenland
从ΔSup18/Supo的水生无脊椎动物中评估全新世气候变异性的中期气候变异性仍然存在于格陵兰西南部
  • DOI:
    10.1016/j.quascirev.2024.108664
  • 发表时间:
    2024-06-01
  • 期刊:
  • 影响因子:
    3.300
  • 作者:
    Briana A. Edgerton;Yarrow Axford;Melissa L. Chipman
  • 通讯作者:
    Melissa L. Chipman
Aquatic moss δsup18/supO as a proxy for seasonally resolved lake water δsup18/supO, northwest Greenland
水生苔藓ΔSup18/supo作为季节性解决的湖水ΔSup18/supo,西北格陵兰岛的代理
  • DOI:
    10.1016/j.quascirev.2024.108682
  • 发表时间:
    2024-06-15
  • 期刊:
  • 影响因子:
    3.300
  • 作者:
    Peter J.K. Puleo;Pete D. Akers;Ben G. Kopec;Jeffrey M. Welker;Hannah Bailey;Magdalena R. Osburn;Tenna Riis;Yarrow Axford
  • 通讯作者:
    Yarrow Axford
Aquatic moss δ<sup>18</sup>O as a proxy for seasonally resolved lake water δ<sup>18</sup>O, northwest Greenland
  • DOI:
    10.1016/j.quascirev.2024.108682
  • 发表时间:
    2024-06-15
  • 期刊:
  • 影响因子:
  • 作者:
    Peter J.K. Puleo;Pete D. Akers;Ben G. Kopec;Jeffrey M. Welker;Hannah Bailey;Magdalena R. Osburn;Tenna Riis;Yarrow Axford
  • 通讯作者:
    Yarrow Axford

Yarrow Axford的其他文献

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{{ truncateString('Yarrow Axford', 18)}}的其他基金

Doctoral Dissertation Research: A Paleolimnological Investigation of Climate and Nitrogen Impacts on Primary Producers in Greenland Lakes and Community Water Supplies
博士论文研究:气候和氮对格陵兰湖泊和社区供水初级生产者影响的古湖泊学调查
  • 批准号:
    2330271
  • 财政年份:
    2024
  • 资助金额:
    $ 1.6万
  • 项目类别:
    Standard Grant
Collaborative Research: Climate Change and Human Adaptation in Arctic-like Environments across the Pleistocene-Holocene Transition
合作研究:更新世-全新世过渡期间类北极环境中的气候变化和人类适应
  • 批准号:
    2305723
  • 财政年份:
    2023
  • 资助金额:
    $ 1.6万
  • 项目类别:
    Continuing Grant
Seasonality of Abrupt Climate Change over Greenland: Direct Tests for the Younger Dryas and 8.2 ka event using Paleolimnology
格陵兰岛气候突变的季节性:利用古湖沼学对新仙女木期和 8.2ka 事件进行直接测试
  • 批准号:
    2002515
  • 财政年份:
    2020
  • 资助金额:
    $ 1.6万
  • 项目类别:
    Standard Grant
Doctoral Dissertation Research: A Geospatial Analysis of Alpine Glacial Variability
博士论文研究:高山冰川变化的地理空间分析
  • 批准号:
    1812764
  • 财政年份:
    2018
  • 资助金额:
    $ 1.6万
  • 项目类别:
    Standard Grant
CAREER: South Greenland's Holocene Climate History Reconstructed Using Three Paleolimnological Approaches
职业:使用三种古湖泊学方法重建格陵兰岛南部的全新世气候历史
  • 批准号:
    1454734
  • 财政年份:
    2015
  • 资助金额:
    $ 1.6万
  • 项目类别:
    Standard Grant
COLLABORATIVE RESEARCH: Response of the Northwest Greenland cryosphere to Holocene climate change
合作研究:格陵兰岛西北部冰冻圈对全新世气候变化的响应
  • 批准号:
    1108306
  • 财政年份:
    2012
  • 资助金额:
    $ 1.6万
  • 项目类别:
    Standard Grant
Collaborative research: Coupled glacial and lacustrine evidence for decadal- to millennial-scale variability in the climatologic Aleutian low, southern Alaska
合作研究:阿拉斯加南部阿留申低压气候十年至千年尺度变化的冰川和湖泊耦合证据
  • 批准号:
    1137983
  • 财政年份:
    2010
  • 资助金额:
    $ 1.6万
  • 项目类别:
    Continuing Grant
Collaborative Research: Testing Mechanisms for Holocene Climate Change in the Southern Tropical and Mid-Latitude Andes
合作研究:热带南部和中纬度安第斯山脉全新世气候变化的测试机制
  • 批准号:
    1003082
  • 财政年份:
    2010
  • 资助金额:
    $ 1.6万
  • 项目类别:
    Standard Grant
Collaborative Research: Testing Mechanisms for Holocene Climate Change in the Southern Tropical and Mid-Latitude Andes
合作研究:热带南部和中纬度安第斯山脉全新世气候变化的测试机制
  • 批准号:
    1138274
  • 财政年份:
    2010
  • 资助金额:
    $ 1.6万
  • 项目类别:
    Standard Grant
Collaborative research: Coupled glacial and lacustrine evidence for decadal- to millennial-scale variability in the climatologic Aleutian low, southern Alaska
合作研究:阿拉斯加南部阿留申低压气候十年至千年尺度变化的冰川和湖泊耦合证据
  • 批准号:
    0823583
  • 财政年份:
    2008
  • 资助金额:
    $ 1.6万
  • 项目类别:
    Continuing Grant

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