Collaborative Research: Neotropical climate and environmental change over 400ka of glacial-interglacial cycles from Lake Peten Itza

合作研究：佩滕伊察湖 400ka 冰川-间冰期循环中的新热带气候和环境变化

• 批准号: 2002520
• 负责人: Melissa Berke
• 金额: $ 36.31万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2002520&HistoricalAwards=false
• 关键词: Collaborative; Research; Neotropical; climate; environmental

Historically, much of our understanding of significant environmental change in the past glacial cycles has primarily come from high latitude regions. However, the spatial pattern of glacial-interglacial climate and environmental variability in the tropics underscores the need for longer and better constrained data sets from the region to fully understanding forcings and potential feedbacks. The tropics play a crucial role in global moisture balance and heat redistribution. Additionally, environmental change in continental systems is also generally greater in amplitude and more spatially heterogeneous than in marine environments, where many of the early records of tropical climate variability are located. Thus, terrestrial records from the tropics are particularly necessary to fully resolve regional variability of glacial-interglacial climate variability and for comparison to existing high latitude records. This project will contribute to an enhanced understanding of Neotropical paleoclimate over the last 400 thousand years, and will illuminate temperature, hydroclimate, and vegetation shifts for a key location in Central America, Lake Petén Itzá. The researchers will mentor students in scientific communication with the broader public, focusing on the societal relevance of paleoclimate research, and will develop a paleoclimate-based, data-integrated exercise that will be used for hands-on undergraduate classes. Additionally, the project team will develop an open-access article describing paleoclimate science in an online journal aims to inspire and educate the next generation of scientists, reaching a large global student audience.Lake Petén Itzá, Guatemala, lies in a region dominated by trade wind migration and is influenced by sea surface temperature changes in the subtropical Atlantic basin. It thus represents a key spatial node for understanding large-scale climate variability of the northern tropics of the Americas. The investigators will use existing, archived drill cores from Lake Petén Itzá to develop records of changing Neotropical temperature (using brGDGTs) and precipitation (using δD values of leaf waxes), and the response of terrestrial vegetation (using δ13C values of leaf waxes) to these changes, in order to examine climate and ecosystem evolution over the past 400 ka. The investigators will integrate findings from the organic geochemical sedimentary reconstructions with previously published and currently on-going sedimentological and palynological research from Petén Itzá. Proxy-model comparison work will also be completed using these integrated reconstructions and other regionally available records with water isotope-enabled GCM experiments.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.

从历史上看，我们对过去冰川周期重大环境变化的大部分了解主要来自高纬度地区，然而，热带地区冰期-间冰期气候和环境变化的空间格局强调需要更长、更好的约束数据集。热带地区在全球水分平衡和热量再分配中发挥着至关重要的作用，大陆系统的环境变化通常也比海洋系统的幅度更大，空间异质性更强。因此，热带地区的陆地记录对于充分解决冰期-间冰期气候变化的区域变化以及与现有高纬度记录进行比较特别必要。加深对过去 40 万年新热带古气候的了解，并将阐明中美洲关键地点佩滕伊察湖的温度、水文气候和植被变化。研究人员将为学生提供科学指导。与更广泛的公众沟通，重点关注古气候研究的社会相关性，并将开发一种基于古气候的数据集成练习，用于本科生实践课程此外，项目团队将编写一篇开放获取的文章。在在线期刊中描述古气候科学旨在激励和教育下一代科学家，覆盖全球大量学生受众。危地马拉佩滕伊察湖位于一个以信风迁徙为主的地区，并受到该地区海面温度变化的影响。因此，它是了解美洲北部热带地区大规模气候变化的关键空间节点，研究人员将使用佩滕伊察湖现有的存档钻芯来记录新热带温度的变化（使用 brGDGT）。和降水（使用叶蜡的 δD 值），以及陆地植被（使用叶蜡的 δ13C 值）对这些变化的响应，以研究气候和生态系统的演变。研究人员将把有机地球化学沉积重建的结果与佩滕伊察先前发表的和目前正在进行的沉积学和孢粉学研究相结合，并使用这些综合重建和其他区域可用的记录来完成。水同位素启用的 GCM 实验。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。