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: 2303409
• 负责人: Richard Heermance
• 金额: $ 18.78万
• 依托单位: The University Corporation, Northridge
• 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=2303409&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器。通过最后一个冰河时代重建的冰川位置已被用于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沿着大陆内部（例如，落基山脉）或内华达州山脉。该项目通过重建过去的冰川变化来调查北方加州克拉马斯山脉的Trinity阿尔卑斯地区过去20，000年的气候变化。这项研究提供了太平洋近端克拉马斯山脉冰川作用的第一个定量数据，该山脉可能与内陆山脉气候异相。这项研究正在对北方加州过去的气候进行新的重建，并填补了美国西部沿着冰川历史的空间空白。该项目突出了气候变化对北方加州冰川的影响，以及对加州和全球水资源的社会影响。其他项目目标包括充当催化剂，激励和招募地球科学本科专业人员，并开发地质和环境科学家的职业途径。所有项目机构都是少数民族服务或西班牙裔服务机构;该项目为32名学生提供了为期一周的实地考察机会，重点是中央谷水项目和加州的水资源。通过汇集来自该州最北部和最南部地区的不同学生，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。此外，13名本科生和3名研究生被支持进行研究，并在会议上展示他们的发现。该项目采用多学科方法，通过整合地貌测绘、10 Be地表暴露测年、湖泊沉积物取芯、树木年代学/树木气候学以及冰川和气候变化的数值模拟，确定北方加州的Trinity阿尔卑斯山过去的气候变化，并评估这些变化的机制。直到最近的消亡，Trinity阿尔卑斯山的冰川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州山脉的冰川更接近太平洋的水分来源。因此，与美国大陆的干旱地区相比，Trinity阿尔卑斯山的冰川在过去2万年里对气候变化的反应可能有所不同。这些过去的气候变化的机制正在通过比较该项目的气候重建，从PMIP 4/CMIP 6和以前出版的古气候记录的古气候全球气候模型的输出进行评估。通过使用来自多个学科的方法，该项目提供了一个新的冰川和气候历史的北方加州和评估的机制与这些变化。这个奖项反映了NSF的法定使命，并已被认为是值得支持的评估使用基金会的智力价值和更广泛的影响审查标准。