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.

多年冻土或长期冷冻的地面，拥有大量的碳储层。这项研究的总体目标是寻找最近的地质过去，以提高人们对气候未来变化的理解，如何影响碳的积累和释放。研究人员在古生态学，古气候学，表面地质学，地球人工学和定量地球学方面拥有专业知识。他们将共同量化气候与碳质量之间在过去40，000年的截然不同的气候下在北极的高地地区累积的碳质量之间的关系，这将表达先前关于气候变化对气候变化对低层地形湖泊和泥炭地的影响的工作。结果将为永久冻土碳网络增加古角度，这是环境北极变化研究的一部分。该项目将为毕业生和本科生提供培训，调查人员团队包括早期的职业科学家。在这项研究中，研究人员将结合现场填充，对沉积物核心的分析以及建模，以量化八英里湖水中北部楼上的高地研究地点的气候与永久弗罗斯特碳积累之间的千禧年规模关系。他们将沿着山坡样带占据多个沉积物岩心，以绘制底层地层框架。对比层面的表面材料在短坡度和长坡度上，以推断斜率长度与斜率依赖性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的演化，并评估转移沉积物和隔离碳的下坡地貌过程。研究人员还将使用大化石的放射性碳日期来确定有机物在地层上混合的程度，并分布千禧一代的积累时期；评估社区特征和晶粒尺寸分布的花粉和大化石；并分析了一套生物物理特性的沉积物序列，以量化碳质量，积累和分解。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子和更广泛影响的评估来审查标准的评估值得支持的。

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