CAREER: Quantifying climate induced landscape evolution during early Eocene hyperthermals

职业：量化始新世早期高温期间气候引起的景观演化

• 批准号: 2237624
• 负责人: Emily Beverly
• 金额: $ 79.6万
• 依托单位: University of Houston
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-02-01 至 2028-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2237624&HistoricalAwards=false
• 关键词: CAREER; Quantifying; climate; induced; landscape

The US has incurred billions of dollars in damage from extreme precipitation events linked to anthropogenic climate change since the 1980s. Increased erosion and sediment yield from these events is likely to damage soils, clog rivers, and cripple hydraulic infrastructure. However, we have little information on the magnitude of the response of our rivers and landscapes to global climate change because these changes occur on timescales difficult to measure in our lifetimes. Therefore, we must look to times in Earth’s past when temperatures and atmospheric CO¬2 concentrations rose rapidly to study landscape response. During the early Eocene, approximately 56 to 52 million years ago, there were repeated intervals known as hyperthermal events where global temperatures rapidly increased due to releases of CO2 over a period of ~20,000 years. These hyperthermals provide one of the best analogs to modern anthropogenic climate change, albeit at a slower rate than today. This project will focus on improving scientific and public understanding of how future climate change will affect our river systems by using analogs from the early Eocene in New Mexico, Wyoming, and North Dakota. The education plan will target a diverse population of students from the University of Houston that will strengthen undergraduate exposure to field geology using virtual field trips. Because climate change can be an abstract and intimidating concept for some groups, collaborations with a world-renowned climate-artist will be used to break down mental barriers and communicate science to the public and low-income and minority students from the Houston area. This project will generate new terrestrial paleoclimate records from three fluvially dominated basins in the western US: 1) San Juan Basin of New Mexico, 2) Wind River Basin of Wyoming, and 3) Williston Basin of North Dakota. It will use a novel method that integrates datasets from both sandstone channel facies and floodplain paleosols to test the hypothesized connection between hyperthermal-driven hydrologic cycle intensification and increased weathering that formed large sand bodies and thick packages of kaolinite. This project will use a multi-proxy approach that includes geochemistry, mineralogy, stable isotopes (δ13C, δ18O, and Δ47), sedimentology, stratigraphy, radiogenic isotope geochronology (40Ar/39Ar, U-Th-Pb), and magnetostratigraphy to reconstruct the paleoclimate and constrain landscape response to the hyperthermal events both spatially and temporally. The resulting dataset will be integrated into quantitative models to test how rapid atmospheric CO2 increases, global warming, and the resulting hydrologic cycle intensification will increase the magnitude of weathering and sediment yield, which has the potential to cause billions of dollars in damage to infrastructure and ecosystems from soil loss, erosion, and increased flooding.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.

自1980年代以来，美国因极端降水事件与人为气候变化有关的极端降水事件造成了数十亿美元的破坏。这些事件的侵蚀和沉积物产量增加可能会损害土壤，堵塞河流和加密氢基础设施。但是，我们几乎没有关于河流反应的幅度以及对全球气候变化的景观的幅度，因为这些变化发生在我们一生中难以衡量的时间尺度上。因此，当温度和大气中的Co -2浓度迅速研究以研究景观反应时，我们必须考虑地球过去的时代。在始新世的早期（大约56至5200万年前），有重复的间隔称为高温事件，在约20，000年内，由于二氧化碳释放而迅速升高，全球温度迅速升高。这些高温群体提供了对现代人为攀岩变化的最佳类似物之一，尽管速度比今天慢。该项目将着重于通过使用新墨西哥州，怀俄明州和北达科他州的始新世早期的类似物来改善对未来气候变化将如何影响我们河流系统的科学和公众理解。该教育计划将针对休斯顿大学的多样化学生，这些学生将通过虚拟实地考察加强本科生对现场地质的接触。由于气候变化对于某些团体来说可能是一个抽象而令人生畏的概念，因此与世界知名的气候艺术家的合作将用于打破心理障碍，并向休斯顿地区的公共，低收入和少数派学生传达科学。该项目将产生来自美国西部三个河流主导的低音的新陆地古气候记录：1）新墨西哥州的圣胡安盆地，2）怀俄明州的风河盆地和3）北达科他州的威利斯顿盆地。它将使用一种新颖的方法，该方法整合了来自砂岩通道设施和洪泛区古溶物的数据集，以测试高温驱动的水文循环强化和增加的风化之间的假设联系，从而形成了大型砂物体和高高林的厚包装。该项目将采用多种方法，包括地球化学，米纳学，稳定同位素（Δ13C，Δ18O和Δ47），沉积学，地层学，放射性同位素年代学（40AR/39AR，u-th-pB），以及对整个事件的响应和磁构成，并构成了范围的范围，并构成了范围的范围，并构成了范围的范围，并构成了范围的范围，并构成了整体的范围，并构成了范围的范围。 暂时地。所得数据集将集​​成到定量模型中，以测试大气中的二氧化碳的增加，全球变暖以及由此产生的水文周期强度将增加风化和沉积物产量的幅度，这有可能导致数十亿美元的基础损害对基础设施的损害，从而对土壤丧失，洪水泛滥和洪水予以改善。利用基金会的知识分子和更广泛的影响审查标准。