Pilot Project: Reconstructing tropical North American climate with the sedimentary record of Lake Chalco, Mexico

试点项目:利用墨西哥查尔科湖的沉积记录重建北美热带气候

基本信息

  • 批准号:
    0902682
  • 负责人:
  • 金额:
    $ 10.28万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2009
  • 资助国家:
    美国
  • 起止时间:
    2009-09-01 至 2011-08-31
  • 项目状态:
    已结题

项目摘要

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).This project examines a sedimentary sequence from Lake Chalco (Central Mexico) to develop a ~50 kyr record of terrestrial climate variability in the North American tropics. The project uses proxies that reflect hydrological and thermal variability, focusing in particular on the transition from the Last Glacial Maximum to the Holocene. This project is in cooperation with the Autonomous University of Mexico who, in the first phase of a drilling program, recovered a ~100 m drill core. Subsequent drilling may extend this by 100 m, providing a record back to ~300 ka that includes the previous two interglacials. This pilot project focuses on the uppermost 50 m of the core recovered earlier. The analyses include x-ray fluorescence core scanning for major elemental composition at an average resolution of ~20 years through the 50 m section, as well as a series of organic geochemical analyses, including MBT (paleotemperature), biomarker del-D (aridity) and lignins and biomarker del-13C (vegetation response) at ~1000 year resolution since 50 ka. This work provides a 'proof of concept' for this site and a unique level of information on past temperatures and precipitation since mid-MIS 3 in a region where climate records are sparse. The climate record from Chalco should provide insights on regional responses to past changes in coupled climate systems. Recent work in Antarctic ice cores documents significant differences in atmospheric pCO2 and climate change over the Middle Pleistocene (EPICA 2005, Siegenthaler, 2005), but high-resolution continental records spanning this interval are rare globally and absent in North America. The full Chalco record has the potential to provide unique information that fills this critical gap, improving our understanding of our present interglacial and its future course.This project contributes to the training of the next generation of geoscientists through the direct support of graduate and undergraduate students. This study also fosters international collaboration among scientific communities in the U.S. and Mexico; Mexican students will come to the Large Lakes Observatory to work on this project.Broader impacts to the scientific community include a reconstruction of the climate history of central Mexico spanning the past 35 kyr, and a validation of the application of the MBT paleotemperature proxy in lacustrine systems of Mexico. 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 climate system processes and how they are reflected in geochemical proxy records can help in modeling future climate trends. Appropriate application of rigorously investigated proxies provides the best information about paleoclimate estimates currently available on timescales beyond the existence of instrumental records.
该奖项是根据2009年美国复苏和再投资法案(公法111-5)资助的。该项目研究了查尔科湖(墨西哥中部)的沉积序列,以开发北美热带陆地气候变化的约50 kyr记录。该项目使用反映水文和热变化的代用指标,特别侧重于从末次盛冰期到全新世的过渡。该项目是与墨西哥自治大学合作进行的,该大学在钻探计划的第一阶段回收了约100米的岩芯。随后的钻探可能会将其延长100米,提供一个可以追溯到约300 ka的记录,其中包括前两次间冰期。该试点项目的重点是早先采出的岩芯最上面50米。分析包括X射线荧光岩心扫描的主要元素组成,平均分辨率为20年,通过50米的部分,以及一系列的有机地球化学分析,包括MBT(古温度),生物标志物del-D(干旱)和木质素和生物标志物del-13 C(植被响应)在约1000年的分辨率,因为50万年。这项工作提供了一个“概念证明”,为这个网站和一个独特的信息水平,过去的温度和降水,因为中MIS 3在一个地区的气候记录是稀疏的。中铝的气候记录应该可以提供有关区域对耦合气候系统过去变化的反应的见解。最近在南极冰芯中的工作记录了中更新世大气pCO 2和气候变化的显着差异(EPICA 2005,Siegenthaler,2005),但跨越这段时间的高分辨率大陆记录在全球范围内很少见,在北美也不存在。完整的中铝记录有可能提供独特的信息,填补这一关键空白,提高我们对当前间冰期及其未来进程的理解。通过研究生和本科生的直接支持,该项目有助于培养下一代地球科学家。该研究还促进了美国和墨西哥科学界之间的国际合作;墨西哥学生将来到大湖观测站开展该项目。对科学界的更广泛影响包括重建墨西哥中部过去35 kyr的气候历史,以及验证MBT古温度代理在墨西哥湖泊系统中的应用。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。更好地了解气候系统过程以及它们如何反映在地球化学代用记录中,有助于模拟未来的气候趋势。适当应用严格调查代理提供了最好的信息,目前可在时间尺度上的古气候估计超出仪器记录的存在。

项目成果

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Erik Brown其他文献

Inorganic geochemistry of lake sediments: A review of analytical techniques and guidelines for data interpretation
湖泊沉积物的无机地球化学:分析技术综述与数据解释指南
  • DOI:
    10.1016/j.earscirev.2023.104639
  • 发表时间:
    2024-02-01
  • 期刊:
  • 影响因子:
    10.000
  • 作者:
    Sebastien Bertrand;Rik Tjallingii;Malin E. Kylander;Bruno Wilhelm;Stephen J. Roberts;Fabien Arnaud;Erik Brown;Richard Bindler
  • 通讯作者:
    Richard Bindler
Safe passage for fish: The case for in-stream turbines
鱼类的安全通道:关于河道内涡轮机的案例
  • DOI:
    10.1016/j.rser.2022.113034
  • 发表时间:
    2023-03-01
  • 期刊:
  • 影响因子:
    16.300
  • 作者:
    Erik Brown;Samer Sulaeman;Raul Quispe-Abad;Norbert Müller;Emilio Moran
  • 通讯作者:
    Emilio Moran

Erik Brown的其他文献

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{{ truncateString('Erik Brown', 18)}}的其他基金

Graduate Research Fellowship Program (GRFP)
研究生研究奖学金计划(GRFP)
  • 批准号:
    2240238
  • 财政年份:
    2022
  • 资助金额:
    $ 10.28万
  • 项目类别:
    Fellowship Award
Graduate Research Fellowship Program (GRFP)
研究生研究奖学金计划(GRFP)
  • 批准号:
    1840377
  • 财政年份:
    2018
  • 资助金额:
    $ 10.28万
  • 项目类别:
    Fellowship Award
NSFGEO-NERC: Collaborative Research: MexiDrill: Developing a 350,000 year record of climate and environmental change in tropical North America
NSFGEO-NERC:合作研究:MexiDrill:开发北美热带地区 35 万年的气候和环境变化记录
  • 批准号:
    1803725
  • 财政年份:
    2018
  • 资助金额:
    $ 10.28万
  • 项目类别:
    Continuing Grant
MexiDrill: The Basin of Mexico Drilling Program
MexiDrill:墨西哥盆地钻探计划
  • 批准号:
    1551311
  • 财政年份:
    2016
  • 资助金额:
    $ 10.28万
  • 项目类别:
    Standard Grant
Collaborative Research: Facility Support: National Lacustrine Core Facility (LacCore)
合作研究:设施支持:国家湖泊核心设施(LacCore)
  • 批准号:
    1462347
  • 财政年份:
    2015
  • 资助金额:
    $ 10.28万
  • 项目类别:
    Continuing Grant
Collaborative Research: An ultra-high-resolution record of drought, flood, and coupled ocean-atmosphere climate oscillations in Holocene and late Quaternary Californian sediments
合作研究:全新世和晚第四纪加利福尼亚沉积物中干旱、洪水和海洋-大气耦合气候振荡的超高分辨率记录
  • 批准号:
    1304148
  • 财政年份:
    2013
  • 资助金额:
    $ 10.28万
  • 项目类别:
    Standard Grant
IPG: Collaborative Research: A high-resolution analysis of unique paleoenvironmental data from key hominin sites in East Africa
IPG:合作研究:对东非主要古人类遗址的独特古环境数据进行高分辨率分析
  • 批准号:
    1241530
  • 财政年份:
    2012
  • 资助金额:
    $ 10.28万
  • 项目类别:
    Standard Grant
Collaborative Research: Facility Support: National Lacustrine Core Facility (LacCore)
合作研究:设施支持:国家湖泊核心设施(LacCore)
  • 批准号:
    0949285
  • 财政年份:
    2010
  • 资助金额:
    $ 10.28万
  • 项目类别:
    Continuing Grant
EAGER: Seismic survey to evaluate the potential of Lake Chalco, Mexico, for continental drilling
EAGER:地震调查评估墨西哥查尔科湖大陆钻探潜力
  • 批准号:
    1032589
  • 财政年份:
    2010
  • 资助金额:
    $ 10.28万
  • 项目类别:
    Standard Grant
SGER: The Chesapeake Bay Region's Response to Late-Cenozoic Isostatic Uplift, Subsidence, and Tectonism
SGER:切萨皮克湾地区对晚新生代均衡隆起、沉降和构造作用的响应
  • 批准号:
    0917771
  • 财政年份:
    2009
  • 资助金额:
    $ 10.28万
  • 项目类别:
    Standard Grant

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