EAR-PF: Reconstructing late Holocene hydroclimatic variability in western Central America using multi-proxy analyses of lacustrine sediments

EAR-PF：利用湖泊沉积物的多代理分析重建中美洲西部全新世晚期水文气候变化

• 批准号: 2204484
• 负责人: Derek Gibson
• 金额: $ 18万
• 依托单位: Gibson, Derek K
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-10-01 至 2024-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2204484&HistoricalAwards=false
• 关键词: EAR; PF; Reconstructing; late; Holocene

Dr. Derek Gibson has been awarded an NSF EAR Postdoctoral Fellowship to carry out research and education plans at Missouri University of Science and Technology under the mentorship of Dr. Jonathan Obrist-Farmer. Hydroclimate extremes, particularly droughts, have resulted in an unprecedented increase in climate refugees from Central America over the past decade, creating a humanitarian, economic, and national security crisis. Current climate models predict that Central American precipitation will further decrease by the end of the century. However, the models used to predict such changes rely on records of past climate change and, at present, regional data that reflect how Central American precipitation changed in the past are sparse. This project will use sediment cores collected from Guatemala and southern Mexico to produce evidence of past changes in Central American precipitation that spans the past 2,000 years. In turn, these new records will improve current predictive models of Central American precipitation, which is critical to building a climate-resilient future in Central America and reducing the extent of climate-driven human migration over the upcoming decades. In addition to producing new climate data, K-12 partnerships will extend the impact of this research by educating the next generation of scientists on the mechanisms and impacts of climate change. Educational activities and international collaborations will involve students from elementary to graduate school and provide opportunities for historically underserved students to contribute to solving one of the major climate science questions of the 21st century.Predictable precipitation patterns are critical to the food security and economic stability of Central America. However, inter-model heterogeneity among current climate models, due in part to a paucity of high-resolution and local-scale paleoclimate records that span the late Holocene, make reliable projections of future precipitation difficult. The proposed research will utilize sediment cores from six watersheds located across Guatemala and the Yucatán Peninsula in order to produce multi-proxy reconstructions of local-scale hydroclimatic variability within the context of the synoptic-scale climate changes that occurred during the Medieval Climate Anomaly, Little Ice Age, and Current Warm Period. The proposed field sites are situated such that sediment cores collected from these sites can be used to investigate variability through time in the relative influences of the Inter-tropical Convergence Zone, Caribbean Low-Level Jet, El Niño Southern Oscillation, and topography. Specifically, stratigraphic variability of δ2H in leaf-wax long chain (n-C27, n-C29, n-C31) n-alkanes preserved in the sediment cores will be used as a proxy for regional hydroclimatic variability, while the δ2H of short chain (n-C21, n C23) n-alkanes will be used to reconstruct precipitation/evaporation balance at the local (water column to watershed) scale. These data will be a critical component of predictive models used in the Central American climate resilience and adaptation plans that must be implemented before climate-driven human migration leads to further suffering.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.

德里克·吉布森（Derek Gibson）博士在氢化气候极端博士的指导下，在密苏里大学（Missouri University of HNOLOGY）在密苏里大学（Missouri University）进行了一项NSTDOCTORAL奖学金，尤其是在当前气候模型中的气候难民中，中美洲降级会进一步降低气候模型，这会进一步降低气候难民的培训。中心的末端。在过去的2，000年中，这些新记录又是中美洲降水的新记录，这对于在Centerica中建立气候有弹性的未来至关重要气候数据，K-12合作伙伴关系的促进机构的下一个临床主义者的影响和气候协作的影响将涉及来自小学的学生，并为历史上不足的机会提供了为解决方案贡献的主要气候科学之一。然而，中美洲的粮食安全和稳定性，当前的气候模型中的模型异质。在中世纪的气候异常，冰河时代和当前的温暖时期中发生的天气级气候变化的背景。热带收敛带，加勒比海低水平的南部振荡和地形，具体来说，叶蜡长链中Δ2H的地层变异性（N-C27，N-C29，N-C31，N-C31）在沉积物中保留，而短链N-C21，N C23）N-Alkanes将用于重建本地的降水/蒸发平衡（水柱颜色ICAN气候弹性和适应计划必须在气候驱动的人类迁移之前必须进一步受苦。thizaisAward使用Toundation的知识分子CTS审查标准，反映了NSF'Stuend值得对Suthy进行评估的值得评估。