Collaborative Research: P2C2--East African Monsoon Hydroclimate over the Last 11,500 Years

合作研究：P2C2——过去11,500年的东非季风水文气候

• 批准号: 2002446
• 负责人: Kim Cobb
• 金额: $ 5.49万
• 依托单位: Georgia Tech Research Corporation
• 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: 2020-08-01 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2002446&HistoricalAwards=false
• 关键词: Collaborative; Research; P2C2; East; African

This project aims to build proxy records of speleothem stable isotopes to discern decadal to centennial scale variability in eastern African hydroclimate. The study site is sensitive to large- scale features of the global atmospheric circulation (El nino Southern Oscillation, Walker circulation, monsoon system) and new hydroclimate records will improve the understanding of the drivers of decadal to millennial hydroclimate change in this key region and beyond. Specifically, the researchers will: 1) Establish a high–resolution multi-cave geochronology using extensive Uranium-Thorium (U-Th) dating to determine the duration and magnitude of hydroclimate changes in East Africa. These high-resolution dates will allow identification of active growth intervals vs dry intervals as expressed across the network of caves; 2) Characterize the role of different processes (e.g. large-scale atmospheric circulations and convective processes, local land-atmospheric processes such as re-evaporation etc, and karst hydrological processes such as mixing, recharge) on modern rainwater and dripwater oxygen stable isotopes via the monitoring of cave modern hydrology, analysis of instrumental climate data, and isotope-enabled climate model output; 3) Carry out high-resolution reconstructions of relatively short intervals at ~ 9000 years that are shared across several stalagmites as identified through the U-Th dating targeting. The potential Broader Impacts include generating a detailed knowledge of the nature, timing, and local/regional extent of climatic and environmental changes in Eastern Africa over the last 11,500 years and links to large- scale features of the global atmospheric circulation. The project will provide training for undergraduate and graduate students and will contribute to training of next generation climate scientists particularly from underrepresented groups. Focus will be on cross training in analytical techniques, data analysis, and modeling. This project will facilitate knowledge-based international cooperation with Ethiopian universities.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.

该项目旨在构建speleothem稳定同位素的代理记录，以辨别东非氢化气候的百年尺度变异性。研究地点对全球大气循环的大规模特征（El Nino Southern振荡，Walker循环，季风系统）敏感，而新的氢气候记录将改善对该关键区域及其他地区千禧年氢化气候变化的驱动因素的理解。具体而言，研究人员将：1）使用广泛的铀thorium（u-th）约会来确定东非氢化气候变化的持续时间和幅度。这些高分辨率的日期将允许在整个洞穴网络中识别主动生长间隔与干间隔。 2) Characterize the role of different processes (e.g. large-scale atmospheric circulations and convective processes, local land-atmospheric processes such as re-evaporation etc., and karst hydrologic processes such as mixing, recharge) on modern rainwater and drillwater oxygen stable isotopes via the monitoring of cave modern hydrology, analysis of instrumental climate data, and isotope-enabled climate model output; 3）在大约9000年的时间间隔内进行相对较短的间隔的高分辨率重建，这些间隔在几个通过U-thed Atting Targeting中识别出的几个水生病人共享。潜在的广泛影响包括在过去11,500年中对东非的民用和环境变化的性质，时机以及本地/地区范围产生详细的了解，以及与全球大气循环的大规模特征的联系。该项目将为本科生和研究生提供培训，并将为下一代气候科学家的培训做出贡献，尤其是来自代表性不足的群体。重点将放在分析技术，数据分析和建模的交叉训练上。该项目将促进基于知识的国际合作与埃塞俄比亚大学。该奖项反映了NSF的法定任务，并通过使用基金会的知识分子优点和更广泛的影响评估标准来评估，被认为是珍贵的支持。