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: 2002484
• 负责人: Josef Werne
• 金额: $ 33.21万
• 依托单位: University of Pittsburgh
• 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 2025-02-28
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2002484&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的重大环境变化的大部分理解主要来自高纬度地区。但是，热带冰川间 - 间隙气候和环境变异性的空间模式强调了从该地区更长，更好约束的数据集的需求，以充分了解强迫和潜在的反馈。热带在全球水分平衡和热量重新分布中起着至关重要的作用。此外，在放大器中，连续系统中的环境变化通常比在许多热带气候变异性的早期记录所在的海洋环境中也更频繁地异质性。该项目将有助于增强对新热带古气候的了解，并在中美洲彼得萨湖（LakePeténItzá）阐明温度，氢气气候和植被转移。研究人员将指导学生与更广泛的公众进行科学沟通，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，该运动将用于动手实践本科课程。此外，项目团队将开发一篇开放式访问文章，描述了在线杂志中的古气候科学，旨在激发和教育下一代科学家，吸引大量的全球学生受众。危地马拉的LakePeténItzá位于贸易风迁移主导的区域，并受到贸易风的影响，并受到亚热皮亚底基的海面温度变化的影响。因此，它代表了了解美洲北部热带地区的大规模气候变化的关键空间节点。研究人员将使用来自彼得尼湖湖的现有的，存档的钻头来开发新的新热带温度（使用brgdgts）和降水（使用叶蜡的ΔD值）以及陆生植被（使用Δ13cwaxes的ΔD值的响应）对这些变化的变化，以检查气候和生态系统的差异。研究人员将将有机地球化学沉积重建的发现与PeténItzá的先前出版和目前正在进行的沉积学和当前正在进行的沉积学和帕尔流合理研究相结合。代理模型比较工作还将使用这些集成重建和其他具有水同位素同位素的GCM实验的区域可用记录完成。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子优点和更广泛的影响审查标准通过评估来评估的。