Collaborative Research: Deglacial and Holocene Environmental Change in California's Headwaters: Insights from High-Resolution Sedimentary Records from Mono Lake

合作研究：加利福尼亚州源头的冰消期和全新世环境变化：莫诺湖高分辨率沉积记录的见解

• 批准号: 1828862
• 负责人: Susan Zimmerman
• 金额: $ 17.88万
• 依托单位: Berkeley Geochronology Center
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1828862&HistoricalAwards=false
• 关键词: Collaborative; Research; Deglacial; Holocene; Environmental

As droughts, floods, and wildfires increase in frequency, intensity, and devastation, new emphasis must be placed on understanding the climate system of the American West. This project will study sediments from the Mono Basin, the most important water source for California. Located in the eastern Sierra Nevada, Mono Lake is highly sensitive to changes in the amount of precipitation falling in the region. The project will develop well-dated lake data to compare with climate models for the last ~16,000 years to study the mechanisms that control environmental change. In addition, the project will produce methodological improvements in sediment-dating techniques, produce virtual tours for the Flyover Country mobile phone app and develop educational materials for national park and community groups. The project also will use project datasets in hands-on STEM training for undergraduate and graduate students and high school teachers. Well-dated lake sediment cores provide one of the few terrestrial archives available to extend the record of climate change in the American West into the early Holocene and terminal Pleistocene. Interpretation of geochemical, sedimentological, and paleobiological proxy records from Mono Lake cores will provide continuous records of lake level and productivity that are tied to absolute lake levels available from paleo-shorelines. A sub-centennial-precision age model for the records will allow accurate and precise correlation of terrestrial climate conditions in the West to global records for the first time. This will shed light on the mechanisms controlling Western climate between the waning of the great continental ice sheets and the droughts and pluvials of the last 2000 years, which have been examined in detail in tree-ring records.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.

随着干旱、洪水和野火的频率、强度和破坏程度的增加，必须将新的重点放在了解美国西部的气候系统上。 该项目将研究莫诺盆地的沉积物，莫诺盆地是加利福尼亚州最重要的水源。 莫诺湖位于内华达山脉东部，对该地区降水量的变化高度敏感。该项目将开发过时的湖泊数据，与过去约 16,000 年的气候模型进行比较，以研究控制环境变化的机制。 此外，该项目还将改进沉积物测年技术，为 Flyover Country 手机应用程序制作虚拟旅游，并为国家公园和社区团体开发教育材料。该项目还将在本科生、研究生和高中教师的 STEM 实践培训中使用项目数据集。年代明确的湖泊沉积岩芯提供了为数不多的陆地档案之一，可以将美国西部气候变化的记录延伸到全新世早期和更新世末期。对莫诺湖岩心的地球化学、沉积学和古生物学代理记录的解释将提供与古海岸线可用的绝对湖泊水位相关的湖泊水位和生产力的连续记录。亚百年精度的记录年龄模型将首次实现西方陆地气候条件与全球记录的精确关联。这将揭示控制西部气候在过去 2000 年大陆冰盖消退与干旱和雨雪之间的机制，这些机制已在树木年轮记录中进行了详细研究。该奖项反映了 NSF 的法定使命，并已通过使用基金会的智力优点和更广泛的影响审查标准进行评估，被认为值得支持。