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.

永久冻土层，或常年冻土，拥有一个巨大的碳库。这项研究的总体目标是着眼于最近的地质历史，以提高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的专业知识。总之，他们将量化气候与过去40，000年在北极丘陵高地地区明显不同的气候下积累的碳质量之间的关系，这将补充以前关于气候变化对湖泊和低洼地形泥炭地永久冻土碳影响的工作。研究结果将为永久冻土碳网络增添古视角，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，研究人员将结合联合收割机实地收集，沉积物岩心分析和建模，以量化阿拉斯加山脉北方山麓八里湖流域高地研究地点气候和永久冻土碳积累之间的千年尺度关系。他们将沿沿着山坡剖面采集多个沉积物岩心，绘制底层地层框架图;对比覆盖短山坡和长山坡的表层物质，以推断取决于坡长和坡角的迁移过程的相对作用;并将这些数据用于数值模型，模拟山坡演变，评估转移沉积物和固碳的下坡地貌过程。调查人员还将利用大型化石的放射性碳年代测定法来确定有机物质在地层上混合的程度，并区分千年规模的积累期;评估花粉和大型化石的群落特征和粒度分布;并分析沉积物序列的一套生物物理特性，以量化碳质量，积累，该奖项反映了NSF的法定使命，并通过使用基金会的知识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