Collaborative Research: RUI: Glacier resilience during the Holocene and late Pleistocene in northern California

合作研究：RUI：北加州全新世和晚更新世期间的冰川恢复力

• 批准号: 2303408
• 负责人: Laura Levy
• 金额: $ 40.92万
• 依托单位: Humboldt State University Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-01-01 至 2026-12-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2303408&HistoricalAwards=false
• 关键词: Collaborative; Research; RUI; Glacier; resilience

Glaciers are important water resources for downstream communities and are sensitive recorders of climate change. The reconstructed position of glaciers through the last ice age has been used to infer past climate changes in the western U.S. However, previous research has focused along the continental interior (e.g., the Rocky Mountains) or the Sierra Nevada. This project investigates climate changes over the past 20,000 years in the Trinity Alps region of the Klamath Mountains, northern California by reconstructing past glacier changes. The study provides the first quantitative data on glaciation from the Pacific-proximal Klamath Mountains, a location that may be out-of-phase climatically with interior continental ranges. The research is producing new reconstructions of past climate for northern California and fills a spatial gap in the glacial history along the western United States. The project highlights the impact of climate change on glaciers in northern California, with societal impacts for water resources in California and globally. Additional project goals include acting as a catalyst to inspire and recruit geoscience undergraduate majors and develop pathways for careers as geological and environmental scientists. All project institutions are Minority-Serving or Hispanic-Serving Institutions; the project provides 32 students an opportunity for a one-week field trip focusing on the Central Valley Water Project and water resources in California. By bringing together diverse students from the northernmost and southernmost parts of the state, the aim of this field trip is to stimulate the students’ interest in geoscience, expand their perspectives, and foster collaboration within these future leaders. Additionally, thirteen undergraduate and three graduate students are supported to conduct research and present their findings at conferences. This project uses a multi-disciplinary approach to identify past climate changes in the Trinity Alps of northern California and to evaluate the mechanisms for these changes by integrating geomorphic mapping, 10Be surface exposure dating, lake sediment coring, dendrochronology/dendroclimatology and numerical modeling of glaciers and climate changes. Until their recent demise, glaciers in the Trinity Alps were some of the lowest-elevation glaciers in the continental United States. These glaciers are closer to the moisture source of the Pacific Ocean than the better-studied glaciers in the Rocky Mountains and Sierra Nevada. Thus, glaciers in the Trinity Alps may have responded differently to climate changes over the past 20,000 years than the drier regions in the continental United States. The mechanisms for these past climate changes are being evaluated by comparing the climate reconstructions from this project to output from paleoclimate global climate models from PMIP4/CMIP6 and previously published paleoclimate records. By using methods from multiple disciplines, this project provides a new glacial and climate history for northern California and evaluates of the mechanisms associated with these changes.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.

冰川是下游社区的重要水资源，也是气候变化的敏感记录者。重建的冰川在上一个冰河时期的位置已被用来推断美国西部过去的气候变化。然而，以前的研究主要集中在大陆内部（例如，冰川）。该项目通过重建过去的冰川来调查加利福尼亚州北部克拉马斯山脉三一阿尔卑斯地区过去 20,000 年的气候变化。这项研究提供了关于近太平洋克拉马斯山脉冰川作用的第一份数据，该地区在气候上可能与内陆大陆山脉不同。这项研究是对北加州过去气候的重建，填补了这一空白。该项目强调了气候变化对加利福尼亚州北部冰川的影响，以及对加利福尼亚州和全球水资源的社会影响。所有项目机构都是为少数族裔或西班牙裔服务的机构；该项目为 32 名学生提供了为期一周的实地考察机会，重点关注中央山谷水项目和水。通过聚集来自该州最北端和最南端的不同学生，这次实地考察的目的是激发学生对地球科学的兴趣，扩大他们的视野，并促进这些未来领导者之间的合作。本科生和三名研究生分别是支持进行研究并在会议上展示他们的发现。该项目采用多学科方法来确定北加州三一阿尔卑斯山过去的气候变化，并通过整合地貌测绘、10Be 表面暴露测年、湖泊来评估这些变化的机制。在最近消亡之前，三一阿尔卑斯山的冰川一直是美国大陆海拔最低的冰川之一。这些冰川比落基山脉和内华达山脉的冰川更接近太平洋的水分源，因此，三一阿尔卑斯山的冰川在过去 2 万年中对气候变化的反应可能与干燥地区不同。正在通过比较该项目的气候重建与 PMIP4/CMIP6 和之前发布的古气候全球气候模型的输出来评估这些过去气候变化的机制。通过使用多个学科的方法，该项目为北加州提供了新的冰川和气候历史，并评估了与这些变化相关的机制。该奖项反映了 NSF 的法定使命，并通过使用基金会的评估被认为值得支持。智力价值和更广泛的影响审查标准。