Collaborative Research: Using a Combined Basin Analysis, Isotopic, and Modeling Approach to Reconstruct the LGM through Early Holocene Hydroclimate for Glacial Lake Mojave.

合作研究：利用盆地分析、同位素和建模相结合的方法，通过莫哈韦冰川湖早期全新世水文气候重建末次盛冰期。

• 批准号: 2303484
• 负责人: Daniel Ibarra
• 金额: $ 27.24万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2303484&HistoricalAwards=false
• 关键词: Collaborative; Research; Using; Combined; Basin

Water is California’s (CA) most critical and unpredictable resource. As a predominantly agricultural economy, CA’s socioeconomic success and sustainability are closely tied to water availability. And as the United States' largest state economy, the health of CA is important to the health of the United States. To understand modern and future water availability, scientists look to the past to inform the future – a field of study called paleoclimatology. Arid environments like the Mojave Desert are especially sensitive to water availability. As a result, arid environments are excellent sites for studying past changes in the water cycle. This project will focus on Silver Lake (CA) and combine geological, hydrological, and modeling methods to examine the amplitude, magnitude, and frequency of changes in water availability across one of the most geologically recent and climatically dynamic periods in Earth’s history – the period from the Last Glacial Maximum (ca. 24,000 years before present) to the early Holocene (8,000 years before present). Most importantly, our novel and transdisciplinary methods will allow us to quantify past changes in water availability and assess the climatic drivers that cause these changes. Cal-State Fullerton and Santiago Canyon College (both Hispanic Serving Institutions) will partner with Brown University (a major research-active university) to create a diverse educational and research experience for a total of 15 funded students and 1 post-doc. This multi-institutional collaboration provides a clear pathway for 2-year college students to transfer into 4-year universities and establishes a positive science identity and a sense of belonging in underrepresented groups. This research will use a combined basin analysis (i.e.,core-to-shore), isotopic, and modeling approach to reconstruct a quantitative record of minimum lake depth, minimum lake volume, and the requisite hydroclimatic conditions during the Late Glacial to Early Holocene necessary to fill the Silver Lake Basin, the ostensible terminal basin of Glacial Lake Mojave. Existing and new beach or near-shore geomorphic sites will be identified and characterized using UAV-based, Structure-from-Motion photogrammetry. These shore data, and their respective ages, will be coupled with dated and analyzed sediment cores to quantify changes in minimum lake depth, and thus lake volume, from 24-8 ka. Coupled with these geological data, the project team will apply oxygen isotopic constrained, non-steady state hydrologic models of the lake system to quantify the requisite conditions necessary to fill and sustain Silver Lake during the Late Glacial to Early Holocene. Finally, the results from this work will be compared to a variety of climatic forcings to evaluate the primary drivers of hydroclimatic change in the southern Great Basin. This award is co-funded by the Division of Earth Sciences and Division of Atmospheric and Geospace Sciences by way of the Paleo Perspectives on Present and Projected Climate program, and increases research capabilities, capacity and infrastructure at a wide variety of institution types, as outlined in the GEO EMBRACE DCL.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.

水是加州 (CA) 最重要且不可预测的资源。作为一个以农业为主的经济体，加州的社会成功和可持续发展与水资源的供应密切相关，而作为美国最大的州经济体，加州的健康对整个州的健康至关重要。为了了解现代和未来的水资源供应情况，科学家们通过回顾过去来了解未来——这是一个称为古气候学的研究领域，像莫哈韦沙漠这样的干旱环境对水资源供应特别敏感。研究过去变化的网站该项目将重点关注银湖（CA），并结合地质、水文和建模方法来研究地质最近和气候动态时期之一的可用水量变化的幅度、幅度和频率。地球的历史——从末次盛冰期（距今约 24,000 年）到全新世早期（距今 8,000 年）最重要的是，我们新颖的跨学科方法将使我们能够量化过去的变化。加州州立大学富勒顿分校和圣地亚哥峡谷学院（均为西班牙裔服务机构）将与布朗大学（一所主要的研究型大学）合作，为学生创造多样化的教育和研究体验。共有 15 名受资助的学生和 1 名博士后。这种多机构合作为 2 年制大学生转入 4 年制大学提供了明确的途径，并在代表性不足的群体中建立了积极的科学认同和归属感。研究将使用组合盆地分析（即从核心到海岸）、同位素和建模方法来重建最小湖泊深度、最小湖泊体积的定量记录，以及晚冰期到全新世早期所需的水文气候条件。填满银湖盆地后，将使用基于无人机的运动结构来识别和描述莫哈韦冰川湖表面上的终端盆地。这些岸边数据及其各自的年龄将与已记录日期和分析的沉积物岩心相结合，以量化 24-8 ka 的最小湖泊深度和湖泊体积的变化，并结合这些地质数据。氧同位素约束的湖泊系统非稳态水文模型，用于量化晚冰期至全新世早期填充和维持银湖所需的必要条件。最后，这项工作的结果将与各种结果进行比较。气候强迫，以评估大盆地南部水文气候变化的主要驱动因素。该奖项由地球科学部和大气与地球空间科学部通过“古视角当前和预测气候”计划共同资助，并增加了研究经费。正如 GEO EMBRACE DCL 中所概述的，各种机构类型的研究能力、能力和基础设施。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进行评估，被认为值得支持以及更广泛的影响审查标准。