美国西部尘源的地球化学和矿物学变异特征

IF 3.1 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL Aeolian Research Pub Date : 2024-09-21 DOI:10.1016/j.aeolia.2024.100941
Abby L. Mangum , Gregory T. Carling , Barry R. Bickmore , Nicholas Webb , DeTiare L. Leifi , Janice Brahney , Diego P. Fernandez , Kevin A. Rey , Stephen T. Nelson , Landon Burgener , Joshua J. LeMonte , Alyssa N. Thompson , Beth A. Newingham , Michael C. Duniway , Zachary T. Aanderud
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引用次数: 0

摘要

在干旱和半干旱地区,尘埃事件有多种来源,因此很难量化来源的贡献。如果尘埃的地球化学/矿物成分来源足够明确,则可用于量化不同来源的贡献。为了测试使用地球化学和矿物学测量来区分沙尘排放源的可行性,我们使用了 2018 年至 2020 年期间从 10 个国家风蚀研究网络(NWERN)站点收集的沙尘样本,这些站点是美国西部沙尘源的代表。在许多站点,尘埃成分随季节而变化,但站点内的变化小于站点间的变化,这表明地球化学特征随时间变化是稳健的。由于粉尘地球化学特征存在重叠,因此无法使用常用的主成分分析(PCA)和聚类分析将所有地点分开。不过,线性判别分析(LDA)成功地根据地球化学特征将所有地点区分开来,这表明线性判别分析可用于区分无法用 PCA 或其他方法区分的尘源。此外,基于矿物学数据的 LDA 只使用了有限的几种矿物相来分离大多数地点,而这些矿物相很容易用当地的地质环境来解释。综合来看,地球化学和矿物学测量得出了西北地区各站点灰尘排放的不同特征。如果将范围扩大到美国西部更广泛的地点,那么地球化学和矿物学数据库就可以作为跟踪和量化这些来源的粉尘贡献的基础。
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Characterizing variability in geochemistry and mineralogy of western US dust sources
Dust events originate from multiple sources in arid and semi-arid regions, making it difficult to quantify source contributions. Dust geochemical/mineralogical composition, if the sources are sufficiently distinct, can be used to quantify the contributions from different sources. To test the viability of using geochemical and mineralogical measurements to separate dust-emitting sites, we used dust samples collected between 2018 and 2020 from ten National Wind Erosion Research Network (NWERN) sites that are representative of western United States (US) dust sources. Dust composition varied seasonally at many of the sites, but within-site variability was smaller than across-site variability, indicating that the geochemical signatures are robust over time. It was not possible to separate all the sites using commonly applied principal component analysis (PCA) and cluster analysis because of overlap in dust geochemistry. However, a linear discriminant analysis (LDA) successfully separated all sites based on their geochemistry, suggesting that LDA may prove useful for separating dust sources that cannot be separated using PCA or other methods. Further, an LDA based on mineralogical data separated most sites using only a limited number of mineral phases that were readily explained by the local geologic setting. Taken together, the geochemical and mineralogical measurements generated distinct signatures of dust emissions across NWERN sites. If expanded to include a broader range of sites across the western US, a library of geochemical and mineralogical data may serve as a basis to track and quantify dust contributions from these sources.
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来源期刊
Aeolian Research
Aeolian Research GEOGRAPHY, PHYSICAL-
CiteScore
7.10
自引率
6.10%
发文量
43
审稿时长
>12 weeks
期刊介绍: The scope of Aeolian Research includes the following topics: • Fundamental Aeolian processes, including sand and dust entrainment, transport and deposition of sediment • Modeling and field studies of Aeolian processes • Instrumentation/measurement in the field and lab • Practical applications including environmental impacts and erosion control • Aeolian landforms, geomorphology and paleoenvironments • Dust-atmosphere/cloud interactions.
期刊最新文献
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