Validation of the MBT paleotemperature proxy in lakes

湖泊中 MBT 古温度代理的验证

基本信息

  • 批准号:
    0745658
  • 负责人:
  • 金额:
    $ 19.94万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2008
  • 资助国家:
    美国
  • 起止时间:
    2008-02-15 至 2011-01-31
  • 项目状态:
    已结题

项目摘要

EAR-0745658WERNE, Josef P.Temperature is one of the most critical climate parameters to understand, yet remains difficult to reconstruct. Earth's surface temperature has a tremendous impact on other climate factors, such as hydrological variability. Furthermore, the recent trend of global warming illustrates our need to understand temperature, and its influence on climate change for future generations. A recent report by the IPCC stated that the Earth warmed by 0.6 degrees C during the 20th century, and is projected to warm by an additional ~2-6 degrees C during the 21st century. In addition, a recent NRC Committee has concluded that the recent warming observed in many records is real, but that there is less confidence in temperature reconstructions prior to A.D. 1600, and much less prior to A.D. 900. The primary reason for a lack of confidence in temperature reconstructions, according to the NRC committee, is the relative scarcity of precisely dated proxy evidence. They propose that the generation of additional temperature records would improve our confidence in global temperature reconstructions during the period from 2,000 years before present to today. Furthermore, the NRC committee indicates that efforts to improve the reliability of new temperature reconstructions through use of new developing proxies are also of great interest.Paleotemperature is difficult to measure in continental systems, particularly paleoarchives such as lake sediments. Recent work has highlighted the potential for new, microbial lipid based proxies for temperature to be applied in lake sediments. Bacterial-sourced branched GDGT lipids have been identified in soils, peats, and lake sediments and it appears that the degree of branching in these GDGTs is related to temperature, which can be quantified in the "MBT" index of Weijers et al. (2007). The goal of this proposal is to validate the use of the MBT paleotemperature proxy in lake sediments by (a) determining whether the branched GDGT distribution identified in lake sediments do indeed reflect watershed mean annual air temperature, and (b) to what extent other factors such as seasonal bias and sub-environments within a given watershed are influencing the apparent temperature signal preserved by these bacterial membrane lipids.I propose a series of analyses designed to test the validity of the MBT and CBT proxies as tools to reconstruct temperature and pH from lacustrine sediments, following an approach involving three different avenues of investigation. The combination of these three analytical approaches will target some of the major questions related to reconstructing temperature with the MBT index, including issues related to accuracy of the reconstruction, biases from seasonality and environmental variability, and coherence with the instrumental record. Specifically, the proposed study will be comprised of three major objectives. 1) Development of a global calibration of CBT and MBT between lake surface sediment and watershed mean annual air temperature (MAT). 2) Analysis of MBT in soils from different sub-environments from three selected sites over an annual cycle to identify environmental factors affecting MBT and potential seasonal biases. 3) Comparison of instrumental temperature data from three selected sites with MBT temperatures reconstructed from lake sediments over the past ~100 years. Broader impacts include training graduate and undergraduate students and disseminating information on this research to the public through displays at state parks. Broader impacts to the scientific community include a much-needed validation of the application of the MBT paleotemperature proxy in lacustrine systems. Increasing temperatures predicted by modern global climate change will significantly impact natural systems as well as human populations in the coming century. Gaining a better understanding of modern system processes and how they reflect modern climatic conditions can provide a useful tool for understanding past climate and modeling future trends. Appropriate application of rigorously investigated proxies such as the MBT provides the best information about paleotemperature estimates currently available on timescales beyond the existence if instrumental records, but the use of such proxies is only valid if we fully understand all of the caveats associated with them and apply them appropriately.
WERNE,Josef P.温度是最关键的气候参数之一,但仍然很难重建。地球表面温度对水文变化等其他气候因素有着巨大的影响。此外,最近全球变暖的趋势表明,我们需要了解温度及其对子孙后代气候变化的影响。IPCC最近的一份报告指出,地球在20世纪变暖了0.6摄氏度,预计在21世纪将再变暖约2-6摄氏度。此外,最近的一个NRC委员会得出结论,许多记录中观察到的最近变暖是真实的,但对公元1600年之前的温度重建的信心较低,公元900年之前更是如此。根据NRC委员会的说法,对温度重建缺乏信心的主要原因是精确年代的替代证据相对稀缺。他们提出,生成额外的温度记录将提高我们对从2,000年前到今天的全球温度重建的信心。此外,NRC委员会指出,通过使用新开发的替代物来提高新温度重建的可靠性的努力也很有意义。在大陆系统中,特别是在湖泊沉积物等古档案中,古温度很难测量。最近的工作突出了新的,微生物脂质为基础的代理温度应用于湖泊沉积物的潜力。已在土壤、泥炭和湖泊沉积物中鉴定出细菌来源的分支GDGT脂质,并且这些GDGT中的分支程度似乎与温度有关,这可以在Weijers等人(2007)的“MBT”指数中量化。本提案的目标是通过以下方式验证MBT古温度代用指标在湖泊沉积物中的使用:(a)确定湖泊沉积物中确定的分支GDGT分布是否确实反映了流域年平均气温,以及(B)在多大程度上其他因素,如季节性偏差和次给定流域内的环境正在影响这些细菌膜脂保存的表观温度信号。旨在测试的有效性MBT和CBT代理工具,以重建温度和pH值从湖泊沉积物,以下方法涉及三种不同的调查途径。这三种分析方法的结合将针对与MBT指数重建温度有关的一些主要问题,包括与重建的准确性、季节性和环境变异性的偏差以及与仪器记录的一致性有关的问题。具体而言,拟议研究将包括三个主要目标。 1)在湖泊表面沉积物和流域年平均气温(MAT)之间发展CBT和MBT的全球校准。 2)在一个年度周期内,对三个选定地点的不同亚环境土壤中的MBT进行分析,以确定影响MBT的环境因素和潜在的季节性偏差。 3)过去~100年三个选定地点的仪器温度数据与从湖泊沉积物重建的MBT温度的比较。更广泛的影响包括培训研究生和本科生,并通过在州立公园的展览向公众传播有关这项研究的信息。对科学界更广泛的影响包括对湖相系统中MBT古温度代用指标的应用进行急需的验证。现代全球气候变化所预测的气温上升将在未来世纪对自然系统和人类人口产生重大影响。更好地了解现代系统过程以及它们如何反映现代气候条件,可以为理解过去的气候和模拟未来趋势提供有用的工具。适当应用严格调查的代理,如MBT提供了最好的信息,目前可在时间尺度上的古温度估计超出了仪器记录的存在,但只有当我们充分理解与它们相关的所有注意事项,并适当地应用它们,使用这些代理是有效的。

项目成果

期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)

数据更新时间:{{ journalArticles.updateTime }}

{{ item.title }}
{{ item.translation_title }}
  • DOI:
    {{ item.doi }}
  • 发表时间:
    {{ item.publish_year }}
  • 期刊:
  • 影响因子:
    {{ item.factor }}
  • 作者:
    {{ item.authors }}
  • 通讯作者:
    {{ item.author }}

数据更新时间:{{ journalArticles.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ monograph.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ sciAawards.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ conferencePapers.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ patent.updateTime }}

Josef Werne其他文献

Josef Werne的其他文献

{{ item.title }}
{{ item.translation_title }}
  • DOI:
    {{ item.doi }}
  • 发表时间:
    {{ item.publish_year }}
  • 期刊:
  • 影响因子:
    {{ item.factor }}
  • 作者:
    {{ item.authors }}
  • 通讯作者:
    {{ item.author }}

{{ truncateString('Josef Werne', 18)}}的其他基金

Collaborative Research: Neotropical climate and environmental change over 400ka of glacial-interglacial cycles from Lake Peten Itza
合作研究:佩滕伊察湖 400ka 冰川-间冰期循环中的新热带气候和环境变化
  • 批准号:
    2002484
  • 财政年份:
    2020
  • 资助金额:
    $ 19.94万
  • 项目类别:
    Standard Grant
Collaborative Research: Cyanobacteria, Nitrogen Cycling, and Export Production in the Laurentian Great Lakes
合作研究:劳伦森五大湖的蓝藻、氮循环和出口生产
  • 批准号:
    1948739
  • 财政年份:
    2020
  • 资助金额:
    $ 19.94万
  • 项目类别:
    Standard Grant
NSFGEO-NERC: Collaborative Research: P2C2: MexiDrill: Developing a 350,000 year record of climate and environmental change in tropical North America
NSFGEO-NERC:合作研究:P2C2:MexiDrill:开发北美热带气候和环境变化 35 万年的记录
  • 批准号:
    1804429
  • 财政年份:
    2018
  • 资助金额:
    $ 19.94万
  • 项目类别:
    Continuing Grant
COLLABORATIVE RESEARCH: DETERMINING PATHWAYS OF DIAGENETIC SULFURIZATION OF ORGANIC MATTER USING COMPOUND-SPECIFIC SULFUR ISOTOPIC ANALYSIS
合作研究:利用化合物特异性硫同位素分析确定有机物成岩硫化的途径
  • 批准号:
    1424170
  • 财政年份:
    2014
  • 资助金额:
    $ 19.94万
  • 项目类别:
    Continuing Grant
MRI-R2: Acquisition of a liquid chromatograph-mass spectrometer for biogeochemistry and paleoclimate studies at the Large Lakes Observatory
MRI-R2:在大湖天文台购买用于生物地球化学和古气候研究的液相色谱-质谱仪
  • 批准号:
    0959984
  • 财政年份:
    2010
  • 资助金额:
    $ 19.94万
  • 项目类别:
    Standard Grant
Collaborative Research: A high-resolution middle Pleistocene paleoclimate record from the Valles Caldera, New Mexico
合作研究:来自新墨西哥州火山口火山口的高分辨率中更新世古气候记录
  • 批准号:
    0902888
  • 财政年份:
    2009
  • 资助金额:
    $ 19.94万
  • 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:
    0502456
  • 财政年份:
    2005
  • 资助金额:
    $ 19.94万
  • 项目类别:
    Standard Grant
Linking Archaeal Membrane Lipids and Ecology in Great Lakes: Understanding the TEX86 Paleotemperature Proxy
将古细菌膜脂质与五大湖生态联系起来:了解 TEX86 古温度代理
  • 批准号:
    0452927
  • 财政年份:
    2005
  • 资助金额:
    $ 19.94万
  • 项目类别:
    Standard Grant
Acquisition of stable isotope mass spectrometry system for biogeochemical research at the Large Lakes Observatory
大湖天文台购置稳定同位素质谱系统用于生物地球化学研究
  • 批准号:
    0320880
  • 财政年份:
    2003
  • 资助金额:
    $ 19.94万
  • 项目类别:
    Standard Grant

相似国自然基金

基于MBT-ASTRA技术的智能质谱检测系统研制及其在细菌耐药表型快速检测中的应用
  • 批准号:
  • 批准年份:
    2025
  • 资助金额:
    0.0 万元
  • 项目类别:
    省市级项目
MBT垃圾的环境土工特性及其填埋灾害孕育机理研究
  • 批准号:
    LZ21E080003
  • 批准年份:
    2020
  • 资助金额:
    0.0 万元
  • 项目类别:
    省市级项目
MBT垃圾渗透与变形的相关性及其相互作用机理研究
  • 批准号:
    51978625
  • 批准年份:
    2019
  • 资助金额:
    60.0 万元
  • 项目类别:
    面上项目
基于MBT技术的生活垃圾强度特性及其强度机理研究
  • 批准号:
    51678532
  • 批准年份:
    2016
  • 资助金额:
    62.0 万元
  • 项目类别:
    面上项目
MBT域小分子拮抗剂的设计与合成研究
  • 批准号:
    81072526
  • 批准年份:
    2010
  • 资助金额:
    40.0 万元
  • 项目类别:
    面上项目

相似海外基金

Evaluation of Integrated waste management system based on MBT concept for municipal solid waste
基于MBT概念的城市固体废物综合废物管理系统评价
  • 批准号:
    17H01917
  • 财政年份:
    2017
  • 资助金额:
    $ 19.94万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
ROLE OF MBT FAMILY GENES IN STABILITY OF UNDIFFERENTIATED STATE OF HUMAN PLURIPOTENT STEM CELLS
MBT 家族基因在人类多能干细胞未分化状态稳定性中的作用
  • 批准号:
    15K01280
  • 财政年份:
    2015
  • 资助金额:
    $ 19.94万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Regulation of cell growth and proliferation of neural progenitor cells in the central brain of Drosophila melanogaster by protein kinase Mbt and the nucleolar protein Mbm.
蛋白激酶 Mbt 和核仁蛋白 Mbm 对果蝇中枢神经祖细胞生长和增殖的调节。
  • 批准号:
    264042185
  • 财政年份:
    2014
  • 资助金额:
    $ 19.94万
  • 项目类别:
    Research Grants
The Function of the MBT Family of Epigenetic Regulators in the Hematopoietic System
表观遗传调节因子 MBT 家族在造血系统中的功能
  • 批准号:
    283965
  • 财政年份:
    2012
  • 资助金额:
    $ 19.94万
  • 项目类别:
    Studentship Programs
Discovery of Small Molecule MBT Domain Antagonists
小分子 MBT 结构域拮抗剂的发现
  • 批准号:
    7943037
  • 财政年份:
    2009
  • 资助金额:
    $ 19.94万
  • 项目类别:
Discovery of Small Molecule MBT Domain Antagonists
小分子 MBT 结构域拮抗剂的发现
  • 批准号:
    7812717
  • 财政年份:
    2009
  • 资助金额:
    $ 19.94万
  • 项目类别:
MBTポリコームによるエピジェネティカルな発癌制御
MBT 多梳对致癌作用的表观遗传调控
  • 批准号:
    20011001
  • 财政年份:
    2008
  • 资助金额:
    $ 19.94万
  • 项目类别:
    Grant-in-Aid for Scientific Research on Priority Areas
Analysis of L(3)MBT transgenic mice
L(3)MBT转基因小鼠的分析
  • 批准号:
    20790298
  • 财政年份:
    2008
  • 资助金额:
    $ 19.94万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
新しいポリコーム分子MBT-1による白血病制御を目指して
旨在利用新型多梳分子 MBT-1 控制白血病
  • 批准号:
    18790647
  • 财政年份:
    2006
  • 资助金额:
    $ 19.94万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
The function of I(3)mbt in hematopoietic cancers
I(3)mbt 在造血系统癌症中的作用
  • 批准号:
    6929882
  • 财政年份:
    2003
  • 资助金额:
    $ 19.94万
  • 项目类别:
{{ showInfoDetail.title }}

作者:{{ showInfoDetail.author }}

知道了