RUI: Alpine Loess, Periglacial Uplands, and Exotic Additions: Investigating Past and Present Dust Deposition in the Alpine Zone of the Uinta Mountains, Utah

RUI：高山黄土、冰缘高地和外来物：调查犹他州尤因塔山脉高山地区过去和现在的灰尘沉积

• 批准号: 1524476
• 负责人: Jeffrey Munroe
• 金额: $ 20.3万
• 依托单位: Middlebury College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-08-15 至 2021-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1524476&HistoricalAwards=false
• 关键词: RUI; Alpine; Loess; Periglacial; Uplands

A non-technical description of the project, which explains the project's significance and importanceAtmospheric dust is generated in lowlands through a variety of natural and human-induced processes. Once delivered to high mountain environments, wind-borne dust is responsible for a multitude of effects including altering the pH and chemistry of surface water, contributing to soil formation, and decreasing the reflective properties of snow. In the Rocky Mountains, recent study of lake sediment records suggests that rates of dust deposition have increased in the past few centuries, linking human land use in lowland basins with dust deposition in the mountains. This project will analyze the amount and distribution of dust accumulating in the Uinta Mountains to determine the regional and inter-annual variability in dust deposition rates and properties. Cores from alpine lakes will also be investigated to ascertain the changes in wind-borne deposits over the last several thousand years as continental glaciers receded and human habitation increased. Given the growing evidence that dust deposition plays an important role in the ecology of alpine systems, this project will provide useful information for management of mountain ecosystems and the surrounding basins. This project will be conducted at a primarily undergraduate institution and will train the next generation of research scientists.A technical description of the projectThis project will use an extensive set of existing lake-sediment cores and soils data, along with new collections of dust and soil, to test three complementary hypotheses: 1) Dust flux and geochemical properties are primarily controlled by aridity within regional source areas in the western United States; 2) Post-glacial sedimentary records from high-elevation lakes in the Uintas will record synchronous changes in physical properties that reflect variations in the regional dust system driven by paleoclimate variability; 3) Long-term (~106 - 107yrs) weathering on the unglaciated Uinta summit upland has resulted in the formation of pedogenic clays from elemental building blocks delivered by atmospheric dust. Six undergraduate students will receive training in research techniques and each will complete independent research along with the opportunity to present at professional meetings.

对该项目的非技术性描述，解释了该项目的意义和重要性大气尘埃是通过各种自然和人为过程在低地产生的。一旦被运送到高山环境中，风载灰尘会产生多种影响，包括改变地表水的pH值和化学性质，促进土壤形成，以及降低雪的反射特性。在落基山脉，最近对湖泊沉积物记录的研究表明，在过去几个世纪里，灰尘沉积的速度有所增加，将低地盆地的人类土地使用与山区的灰尘沉积联系起来。该项目将分析乌因塔山脉灰尘积累的数量和分布，以确定灰尘沉积率和性质的区域和年际变化。还将对高山湖泊的岩芯进行调查，以确定在过去几千年里，随着大陆冰川的消退和人类居住的增加，风载沉积物的变化。 鉴于越来越多的证据表明，灰尘沉积在高山生态系统中起着重要作用，该项目将为山区生态系统和周围盆地的管理提供有用的信息。该项目将在一个主要的本科院校进行，并将培养下一代研究科学家。该项目的技术说明该项目将使用一套广泛的现有湖泊沉积物岩心和土壤数据，沿着新收集的灰尘和土壤，以测试三个互补的假设：1）美国西部地区沙尘通量和地球化学性质主要受干旱控制; 2）来自尤因塔斯高海拔湖泊的冰后期沉积记录将记录物理性质的同步变化，反映古气候变化驱动的区域尘埃系统的变化; 3）在未冰川化的Uinta山顶高地上的长期（~106 - 107年）风化作用导致由大气灰尘提供的元素组成块形成成土粘土。六名本科生将接受研究技术的培训，每个人都将完成独立的研究沿着在专业会议上提出的机会。

项目成果

Pedogenic clay formation from allochthonous parent materials in a periglacial alpine critical zone

• DOI: 10.1016/j.catena.2021.105324
• 发表时间: 2021-08
• 期刊: Catena
• 影响因子: 6.2
• 作者: J. Munroe;P. Ryan;A. Proctor

Quantifying the contribution of dust to alpine soils in the periglacial zone of the Uinta Mountains, Utah, USA

• DOI: 10.1016/j.geoderma.2020.114631
• 发表时间: 2020-11
• 期刊: Geoderma
• 影响因子: 6.1
• 作者: J. Munroe;E. Norris;Pratt M. Olson;P. Ryan;M. Tappa;B. Beard

Isotope fingerprinting reveals western North American sources of modern dust in the Uinta Mountains, Utah, USA

• DOI: 10.1016/j.aeolia.2019.03.005
• 发表时间: 2019-06
• 期刊: Aeolian Research
• 影响因子: 3.3
• 作者: J. Munroe;E. Norris;G. Carling;B. Beard;A. Satkoski;Lianwen Liu

Holocene records of eolian dust deposition from high‐elevation lakes in the Uinta Mountains, Utah, USA

美国犹他州尤因塔山脉高海拔湖泊的全新世风尘沉积记录

• DOI: 10.1002/jqs.3250
• 发表时间: 2021
• 期刊: Journal of Quaternary Science
• 影响因子: 2.3
• 作者: Munroe, Jeffrey S.;McElroy, Ryan;O'Keefe, Sam;Peters, Andrew;Wasson, Luna
• 通讯作者: Wasson, Luna