Timing of Tropical Vegetation Response Following Abrupt Deglacial Climate Changes

冰消期气候突变后热带植被响应的时间

基本信息

  • 批准号:
    0447281
  • 负责人:
  • 金额:
    $ 32.5万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2005
  • 资助国家:
    美国
  • 起止时间:
    2005-03-15 至 2008-02-29
  • 项目状态:
    已结题

项目摘要

Global climate is changing at an accelerating pace, and policy makers in society must have accurate predictions of the natural ecosystem response in order to anticipate and mitigate the most severe environmental impacts. With this research, we will measure the response times and rates of change in vegetation assemblages following abrupt climate shifts of the last deglaciation, 15,000 to 10,000 years ago. Annually laminated sediments are ideal for this purpose because they are undisturbed by burrowing organisms and typically have high accumulation rates. We will construct high-resolution records of both terrestrial vegetation and climate change from laminated sediments at two locations in the tropical Atlantic. Vegetation will be characterized using organic compounds (biomarkers) that can be traced back to terrestrial vascular plant sources, whereas records of past climate change will be constructed through continuous analysis of elemental abundances related to river runoff. Vegetation and climate shifts will be comparable across rapid climate transitions between wet and dry conditions from the same sediment cores. This project will provide the most precise measures currently obtainable of the response of vegetation assemblages to rapid climate change, and will address several outstanding questions: How quickly did deglacial vegetation shifts take place? Did vegetation change at the same rate following different rates of climatic change? What was the timing of vegetation change relative to the proximate climate forcing? By helping quantify the sensitivity of vegetation assemblages and entire ecosystems to rapid climate shifts, this work may allow improved prediction of similar changes in the future.
全球气候正在加速变化,社会决策者必须对自然生态系统的反应有准确的预测,以便预测和减轻最严重的环境影响。通过这项研究,我们将测量15,000至10,000年前最后一次冰川消融后气候突变后植被组合的响应时间和变化率。每年的层状沉积物是这一目的的理想选择,因为它们不受洞穴生物的干扰,通常具有很高的堆积率。我们将从热带大西洋的两个地点的叠层沉积物中构建陆地植被和气候变化的高分辨率记录。将使用可追溯到陆地维管植物来源的有机化合物(生物标记物)来表征植被,而过去气候变化的记录将通过持续分析与河流径流有关的元素丰度来构建。植被和气候变化将在相同沉积物岩芯的干湿条件之间的快速气候过渡中具有可比性。该项目将提供目前可获得的关于植被组合对快速气候变化的反应的最精确的措施,并将解决几个悬而未决的问题:去冰川植被转变发生的速度有多快?在不同的气候变化速度下,植被的变化速度是否相同?相对于最近的气候强迫,植被变化的时间是什么?通过帮助量化植被组合和整个生态系统对快速气候变化的敏感性,这项工作可能会改进对未来类似变化的预测。

项目成果

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Konrad Hughen其他文献

Konrad Hughen的其他文献

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{{ truncateString('Konrad Hughen', 18)}}的其他基金

Collaborative Research: Spatio-temporal changes in Red Sea surface hydrology and controls on deep ocean circulation since the 1700s
合作研究:1700年代以来红海表面水文学的时空变化及其对深海环流的控制
  • 批准号:
    2303247
  • 财政年份:
    2023
  • 资助金额:
    $ 32.5万
  • 项目类别:
    Standard Grant
Collaborative Research: Multi-century hydrologic and NAO variability in the tropical Western Atlantic - A Marine NAO Synthesis
合作研究:热带西大西洋的多世纪水文和 NAO 变化 - 海洋 NAO 综合
  • 批准号:
    1903385
  • 财政年份:
    2019
  • 资助金额:
    $ 32.5万
  • 项目类别:
    Standard Grant
Controls on Deep Water Ventilation and Red Sea Overflow Water Formation in the Red Sea
红海深水通风与红海溢流水形成的控制
  • 批准号:
    1657191
  • 财政年份:
    2017
  • 资助金额:
    $ 32.5万
  • 项目类别:
    Standard Grant
Collaborative Research: Organic geochemical and isotopic reconstructions of North Pacific climate and sea ice variability
合作研究:北太平洋气候和海冰变化的有机地球化学和同位素重建
  • 批准号:
    0961728
  • 财政年份:
    2010
  • 资助金额:
    $ 32.5万
  • 项目类别:
    Standard Grant
Multicentury Reconstruction of Tropical Climate Variability from Red Sea Corals
红海珊瑚热带气候变化的多世纪重建
  • 批准号:
    1031288
  • 财政年份:
    2010
  • 资助金额:
    $ 32.5万
  • 项目类别:
    Standard Grant
Collaborative Research: Aquatic Paleoclimate Proxy Records of Tropical Temperature Variability
合作研究:热带温度变化的水生古气候代理记录
  • 批准号:
    0502517
  • 财政年份:
    2005
  • 资助金额:
    $ 32.5万
  • 项目类别:
    Standard Grant
Calibration and Reconstruction of Temperature and Precipitation Change in Arctic Lakes
北极湖泊温度和降水变化的校准和重建
  • 批准号:
    0520226
  • 财政年份:
    2005
  • 资助金额:
    $ 32.5万
  • 项目类别:
    Standard Grant
Collaborative Research: A Synthesis of the Last 2000 Years of Climatic Variability from Arctic Lakes
合作研究:北极湖泊过去 2000 年气候变化的综合
  • 批准号:
    0454609
  • 财政年份:
    2005
  • 资助金额:
    $ 32.5万
  • 项目类别:
    Standard Grant
Radiocarbon Calibration And Climate Change During Marine Isotope Stages 2 and 3
海洋同位素第二阶段和第三阶段期间的放射性碳校准和气候变化
  • 批准号:
    0117356
  • 财政年份:
    2001
  • 资助金额:
    $ 32.5万
  • 项目类别:
    Standard Grant
Calibration and Reconstruction of Past Temperature Changes from Glacial Varved Sediments
冰川变化沉积物过去温度变化的校准和重建
  • 批准号:
    0096751
  • 财政年份:
    2001
  • 资助金额:
    $ 32.5万
  • 项目类别:
    Standard Grant

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Tropical矩阵乘法半群的代数性质及应用
  • 批准号:
    12101280
  • 批准年份:
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  • 资助金额:
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Tropical矩阵半群和Tropical矩阵群
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    2015
  • 资助金额:
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合作研究:热带稀树草原-森林马赛克中火与植被关系的本质
  • 批准号:
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