Dust-mediated loading of trace and major elements to Wasatch Mountain snowpack
Dust-mediated loading of trace and major elements to Wasatch Mountain snowpack
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DOI：
10.1016/j.scitotenv.2012.05.077
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发表时间：
2012-08-15
影响因子：
9.8
通讯作者：
Johnson, William P.
中科院分区：
文献类型：
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作者：
Carling, Gregory T.;Fernandez, Diego P.;Johnson, William P.
2010 年 3 月和 4 月期间，在犹他州瓦萨奇山脉中部的 12 个地点收集了深度积分雪柱，以确定微量元素、主要阴离子和阳离子的浓度以及 pH 值。样本采集是在融化开始之前或接近最大积雪量时进行的，包括由南风前锋风驱动的春季沙尘事件。雪样在实验室中融化，并进行二次取样，用于对过滤（0.45 μm）和未过滤部分进行分析。 3 月份（沙尘事件之前）采样的 6 个地点之间，所有测量元素（Al、As、Ba、Ca、Co、Cr、Cu、Fe、Hg、K、Li、Mg、Mn、Na、Ni、Pb、Sb、Sr、Ti、Tl、U、V 和 Zn）和主要阴离子（Cl、NO3 和 SO4）浓度显着增加（例如，As、Cr、Hg 和 Pb 增加了 2 至 5 倍）以及四月份采样的六个地点（沙尘事件后）。相对于 3 月份的积雪，4 月份的酸中和能力和 pH 值也有所升高。颗粒物（>0.45μm；未过滤和过滤浓度之间的差异）和可溶物（0.45μm）中元素浓度的比较。结果表明，瓦萨奇雪堆中的大部分微量元素负载是通过灰尘沉积发生的。主要元素主要负载在
Depth-integrated snow columns were collected at 12 sites across the central Wasatch Mountains, Utah, during March and April 2010 to determine concentrations of trace elements, major anions and cations, and pH. Sample collection was conducted at or near maximum snow accumulation prior to the onset of melt, and included spring dust events driven by southerly pre-frontal winds. Snow samples were melted in the laboratory and subsampled for analyses on filtered (0.45 mu m) and unfiltered fractions. All measured elements (Al, As, Ba, Ca, Co, Cr, Cu, Fe, Hg, K, Li, Mg, Mn, Na, Ni, Pb, Sb, Sr, Ti, Tl, U, V. and Zn) and major anions (Cl, NO3, and SO4) displayed significant increases in concentration (for example, factor of 2 to 5 increases for As, Cr, Hg, and Pb) between the six sites sampled in March (prior to dust events) and the six sites sampled in April (after dust events). Acid neutralizing capacity and pH were also elevated in April relative to March snowpack. Comparison of elemental concentration in the particulate (>0.45 mu m; difference between unfiltered and filtered concentration) and soluble (0.45 mu m. The results suggest that the majority of trace element loading to the Wasatch snowpack occurs via dust deposition. The major elements were primarily loaded in the