Holocene water levels of Silver Lake, Montana, and the hydroclimate history of the Inland Northwest
Holocene water levels of Silver Lake, Montana, and the hydroclimate history of the Inland Northwest
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蒙大拿州银湖的全新世水位和西北内陆的水文气候历史
DOI：
10.1017/qua.2022.17
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发表时间：
2022
影响因子：
2.3
通讯作者：
Shuman, Bryan N.
中科院分区：
文献类型：
--
作者：
Parish, Meredith C.;Wolf, Kyra D.;Higuera, Philip E.;Shuman, Bryan N.
北美西部内陆最潮湿的地区集中在蒙大拿西部、爱达荷州、不列颠哥伦比亚省和阿尔伯塔省的山区。那里的内陆山脉捕捉到了太平洋风暴的残余。陡峭的东西向水文气候梯度使该地区对内陆渗透水分的变化敏感，这些变化可能在全新世期间发生了很大变化。为了调查潜在的水文气候变化，我们对位于蒙大拿州和爱达荷州边界的银湖进行了7600年的湖面重建。利用放射性碳测年法和地层年代学测定的探地雷达剖面和四个浅水沉积物岩心样带揭示了水分随时间的实质性变化。富含有机物的泥浆单元表明，在7000 cal - 2800 cal - yr BP之前，土壤条件湿润，与现代条件相似，其上覆盖着侵蚀表面，表明在7000 - 2800 cal - yr BP期间比现代条件干燥。2800 - 2300cal yr BP的晚全新世泥层表明了随后的时间海侵水位上升，这与该地区冰川扩张和mesic tree类群丰富度的增加相一致。千年尺度的趋势可能是由全新世期间轨道尺度强迫的变化驱动的，但区域结果可能取决于阿留申低压强度、太平洋表面温度变化和北美西部大气河流频率等因素。
The wettest portion of the interior of western North America centers on the mountainous region spanning western Montana, Idaho, British Columbia, and Alberta. Inland ranges there capture the remnants of Pacific storms. Steep east–west hydroclimate gradients make the region sensitive to changes in inland-penetrating moisture that may have varied greatly during the Holocene. To investigate potential hydroclimate change, we produced a 7600-yr lake-level reconstruction from Silver Lake, located on the Montana–Idaho border. Ground-penetrating radar profiles and a transect of four shallow-water sediment cores that were dated using radiocarbon dating and tephrachronology revealed substantial changes in moisture through time. An organic-rich mud unit indicating wet and similar to modern conditions prior to 7000 cal yr BP is overlain by an erosional surface signifying drier than modern conditions from 7000–2800 cal yr BP. A subsequent time-transgressive increase in water levels from 2800–2300 cal yr BP is indicated by a layer of late Holocene muds, and is consistent with glacier expansion and increases in the abundance of mesic tree taxa in the region. Millennial-scale trends were likely driven by variations in orbital-scale forcing during the Holocene, but the regional outcomes probably depended upon factors such as the strength of the Aleutian Low, Pacific sea-surface temperature variability, and the frequency of atmospheric rivers over western North America.
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影响因子：
2.9
作者：
J. Stone;J. Saros;Trisha L. Spanbauer
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DOI：
10.1016/j.qsa.2020.100021
发表时间：
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期刊：
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影响因子：
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DOI：
--
发表时间：
2009
期刊：
影响因子：
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作者：
D. Gavin
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D. Gavin
影响因子：
3.7
作者：
Brunelle, Andrea;Rehfeldt, Gerald E.;Munson, A. Steven
通讯作者：
Munson, A. Steven