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COLLABORATIVE RESEARCH: Investigating the link between modern spring activity and associated paleospring mounds in Death Valley, NP

合作研究：调查现代春季活动与北卡罗来纳州死亡谷相关古泉丘之间的联系

基本信息

批准号：
2038420
负责人：
Brian Hedlund
金额：
$ 19.15万
依托单位：
University of Nevada Las Vegas
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-07-01 至 2024-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2038420&HistoricalAwards=false
关键词：
COLLABORATIVE RESEARCH Investigating link between

项目摘要

In the coming decades, climate change is projected to reduce water availability in dryland regions and the already water-stressed regions of the southwestern United States. In order to implement sustainable water resource policies, a thorough understanding of regional climate history is essential. The PIs will investigate previously undescribed terrestrial limestone rocks that form from spring activity (travertine) from Keane Wonder Spring (KWST), Death Valley, National Park to reconstruct the timing of past wet events. In addition to their potential as past recorders of the regions’ hydroclimate, travertine deposits serve to better understand how microbial communities that inhabit the spring water and associated sediment become part of the fossil record, thus informing the interpretation of the earliest records of life on Earth. Results from this research will help elucidate past changes in the regions’ hydroclimate and help inform our understanding of the pathways that govern microbial fossilization. This study will support three early to mid-career faculty, two graduate students and five undergraduate students at three institutions (two of which are minority-serving institutions). Training for students and class field trips will provide unique research opportunities for undergraduates including field surveys and lab processing methods. Recent work summarizing global trends in travertine deposits indicates that peaks in deposition correspond with local times of high precipitation or wet conditions. Travertine deposits are common in Death Valley, but their reliability as hydroclimate archives has not been fully vetted across multiple climate transitions and necessitates comparison with well-calibrated, proximal hydroclimate records. In addition to their paleoclimate archive potential, travertine deposits are sensitive recorders of interactions between microbial communities and their environment, making travertine a target setting to assess the morphology and function of fossilized microorganisms. The PIs will use a suite of geochemical and microbiological analyses of modern spring water and associated modern travertine growth along distinct facies types of a spring flow transect to reveal the extent to which active travertine accretion records and preserves microbiological, geochemical, and hydrologic signatures. The PIs will analyze Quaternary travertine deposits at KWST and use a suite of geochemical and geochronological analyses to establish the timing of hydroclimatic changes in the region.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.

在接下来的几十年里，气候变化预计将减少干旱地区和美国西南部本已缺水地区的可用水。为了实施可持续的水资源政策，彻底了解区域气候历史是至关重要的。PI将调查以前未被描述的陆地石灰岩，这些石灰岩来自国家公园死亡谷基恩奇迹泉(KWST)的泉水活动(钙华)，以重建过去潮湿事件的时间。除了作为过去记录该地区水气候的潜力外，石灰华沉积还有助于更好地了解栖息在泉水和相关沉积物中的微生物群落是如何成为化石记录的一部分，从而为解释地球上最早的生命记录提供信息。这项研究的结果将有助于阐明该地区过去的水文气候变化，并有助于我们了解支配微生物石化的途径。这项研究将支持三个机构(其中两个是为少数群体服务的机构)的三名职业生涯早期到中期的教员、两名研究生和五名本科生。对学生的培训和班级实地考察将为本科生提供独特的研究机会，包括实地调查和实验室处理方法。最近总结全球钙华沉积趋势的工作表明，沉积高峰与当地高降雨量或潮湿条件相对应。钙华沉积物在死亡谷很常见，但它们作为水气候档案的可靠性尚未经过多次气候转变的充分审查，因此有必要与校准良好的近端水气候记录进行比较。除了其古气候档案潜力外，钙华沉积还是微生物群落与其环境之间相互作用的敏感记录器，使钙华成为评估微生物化石的形态和功能的目标环境。PIS将使用一套现代泉水的地球化学和微生物分析，以及沿泉水横断面不同相类型的相关现代钙华生长，以揭示活动的钙华沉积记录和保存微生物、地球化学和水文特征的程度。PIS将分析KWST的第四纪钙华矿床，并使用一套地球化学和地质年代学分析来确定该地区水文气候变化的时间。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。