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首页> 外文期刊>Arctic, antarctic, and alpine research >Effect of atmospheric deposition and weathering on trace element concentrations in glacial meltwater at Grand Teton National Park, Wyoming, USA
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Effect of atmospheric deposition and weathering on trace element concentrations in glacial meltwater at Grand Teton National Park, Wyoming, USA

机译：大气沉积和风化对大冬季融水在大提顿国家公园，韦姆明，USMING

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摘要

Glaciers are reservoirs of atmospherically deposited trace elements that are released during melt. Weathering in glacial environments also contributes solutes to proglacial streams. To investigate the relative importance of atmospheric deposition and weathering on trace element chemistry of glacial streams, we sampled supraglacial and proglacial meltwater at two glacierized catchments in Grand Teton National Park, Wyoming, which is located downwind of agricultural/industrial emissions and dust sources. Concentrations of major ions (Mg2+, K+, Na+, Ca2+, SO42-), alkalinity, conductivity, and a subset of trace elements (U, Mo, Sr, Rb, Li, Ba) were low in supraglacial meltwater but increased in proglacial streams because of water-rock interactions. In contrast, concentrations of the trace metals Mn, Co, Zn, Pb, Cd, and Hg had relatively high concentrations in supraglacial meltwater and decreased downstream. These metals are not abundant in the local bedrock and thus are likely sourced from atmospheric deposition. Stable isotopes indicated different water sources in July (snowmelt-dominated) and August (ice melt-dominated), but water chemistry was similar during both months, indicating similar composition of recent snowfall and older ice. These findings have implications for evaluating the relative impacts of atmospheric deposition and weathering in glacier-and snow-dominated catchments.
机译：冰川是在熔体期间释放的大气沉积的微量元素的储层。冰川环境中的风化还会导致口碑流入的溶质。为了探讨大气沉积和风化对冰川溪流的痕量元素化学的相对重要性，我们在大提顿国家公园的两次冰川化集水区进行了取样，位于韦姆明，位于农业/工业排放和尘埃源的渠道。主要离子（Mg2 +，K +，Na +，Ca2 +，SO 42-），碱度，导电性和痕量元素（U，Mo，Sr，Rb，Li，Ba）的浓度低在超透压熔融水中，但在Proglacial流中增加因为水岩相互作用。相反，痕量金属Mn，Co，Zn，Pb，Cd和Hg的浓度在超丙基熔融水中具有相对高的浓度，下游降低。这些金属在本地基岩中并不丰富，因此可能来自大气沉积。稳定的同位素显示了7月（雪花占主导地位）和8月（冰融合的）不同的水源，但在两个月内，水化学相似，表明最近的降雪和较旧的冰是类似的组成。这些发现对评估大气沉积和风化在冰川和雪撬中的相对影响方面具有含义。

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    Carling G. T.; Rupper S. B.; Fernandez D. P.; Tingey D. G.; Harrison C. B.;

  • 作者单位

    Brigham Young Univ Dept Geol Sci S389 ESC Provo UT 84604 USA;

    Univ Utah Dept Geog 332 S 1400 E Room 217 Salt Lake City UT 84112 USA;

    Univ Utah Dept Geol &

    Geophys 115 S 1460 E Room 383 Salt Lake City UT 84112 USA;

    Brigham Young Univ Dept Geol Sci S389 ESC Provo UT 84604 USA;

    Brigham Young Univ Dept Geol Sci S389 ESC Provo UT 84604 USA;

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  • 正文语种 eng
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