Collaborative research: Climate controls on carbon accumulation in upland permafrost at millennial scales

合作研究：千年尺度上气候对高地永久冻土碳积累的控制

• 批准号: 1844181
• 负责人: Irina Overeem
• 金额: $ 5.13万
• 依托单位: University of Colorado at Boulder
• 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: 2020-01-01 至 2024-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1844181&HistoricalAwards=false
• 关键词: Collaborative; research; Climate; controls; carbon

Permafrost, or perennially frozen ground, holds a large reservoir of carbon. The overarching goal of this study is to look to the recent geologic past to improve understanding of how future changes in climate may impact carbon accumulation and release. The investigators have combined expertise in paleoecology, paleoclimatology, surficial geology, geochronology, and quantitiative geomorphology. Together, they will quantify the relationship between climate and the mass of carbon that accumulated under distinctly different climates of the past 40,000 years in hilly upland regions of the Arctic, which will complment previous work on the effects of climate change on permafrost carbon in lakes and peatlands of low-lying terrain. Results will add paleo perspectives to the Permafrost Carbon Network, part of the Study of Environmental Arctic Change. The project will provide training for graduate and undergraduate students, and the team of investigators includes an early career scientist.In this study, the investigators will combine field-collections, analysis of sediment cores, and modeling to quantify the millennial scale relationship between climate and permafrost carbon accumulation at an upland study site in the Eight Mile Lake watershed in the northern foothills of the Alaska Range. They will take multiple sediment cores along hillslope transects to map the underlying stratigraphic framework; contrast the surficial materials mantling both a short and a long slope to infer the relative roles of slope-length- versus slope-angle-dependent transport processes; and use these data in a numerical model to simulate hillslope evolution and assess downslope geomorphic processes that transfer sediment and sequester carbon. The investigators will also use radiocarbon dating of macrofossils to determine the extent to which organic matter has been stratigraphically mixed and to distninguish millennial-scale periods of accumulation; evaluate pollen and macrofossiles for community characteristics and grain size distributions; and analyze sediment sequences for a suite of bio-physical properties to quantify carbon mass, accumulation, and decomposition.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.

永久冻土，或常年冻土，蕴藏着大量的碳。这项研究的首要目标是回顾最近的地质历史，以加深对未来气候变化如何影响碳积累和释放的理解。研究人员结合了古生态学、古气候学、地表地质学、地质年代学和定量地貌学方面的专业知识。他们将共同量化过去 4 万年北极丘陵高地地区气候与在截然不同的气候下积累的碳质量之间的关系，这将补充之前关于气候变化对湖泊和湖泊永久冻土碳影响的研究。低洼地形的泥炭地。结果将为永久冻土碳网络添加古视角，这是北极环境变化研究的一部分。该项目将为研究生和本科生提供培训，研究人员团队包括一名早期职业科学家。在这项研究中，研究人员将结合实地收集、沉积物岩心分析和建模，以量化气候与气候之间的千年尺度关系。阿拉斯加山脉北麓八英里湖流域高地研究地点的永久冻土碳积累。他们将沿着山坡横断面采集多个沉积岩芯，以绘制底层地层框架图；对比覆盖短斜坡和长斜坡的表面材料，以推断斜坡长度与斜坡角度相关的传输过程的相对作用；并在数值模型中使用这些数据来模拟山坡演化并评估转移沉积物和固碳的下坡地貌过程。研究人员还将利用大型化石的放射性碳测年来确定有机物在地层上混合的程度，并区分千年尺度的积累时期；评估花粉和大化石的群落特征和粒度分布；并分析沉积物序列的一系列生物物理特性，以量化碳质量、积累和分解。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。

项目成果

CSDMS Data Components: data–model integration tools for Earth surface processes modeling

CSDMS 数据组件：用于地球表面过程建模的数据模型集成工具

• DOI: 10.5194/gmd-17-2165-2024
• 发表时间: 2024
• 期刊: Geoscientific Model Development
• 影响因子: 5.1
• 作者: Gan, Tian;Tucker, Gregory E.;Hutton, Eric W.;Piper, Mark D.;Overeem, Irina;Kettner, Albert J.;Campforts, Benjamin;Moriarty, Julia M.;Undzis, Brianna;Pierce, Ethan
• 通讯作者: Pierce, Ethan