Modelling climate constraints on the formation of pluvial Lake Bonneville in the Great Basin, United States

Modelling climate constraints on the formation of pluvial Lake Bonneville in the Great Basin, United States
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模拟美国大盆地邦纳维尔洪流湖形成的气候限制

DOI:
10.1002/jqs.3394
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发表时间:
2021
影响因子:
2.3
通讯作者:
Quirk, Brendon J.
Quirk, Brendon J.
中科院分区:
地球科学3区
文献类型:
--
作者:
Belanger, Bryce K.;Amidon, William H.;Laabs, Benjamin J. C.;Munroe, Jeffrey S.;Quirk, Brendon J.

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本研究使用水文平衡模型来评估晚更新世期间维持邦纳维尔湖在两个湖平面所需的降水和温度(P-T)条件的范围。与第二组P-T曲线相交,该曲线是从附近瓦萨奇山脉的冰川建模中确定的,这表明从21到15 ka湿度逐渐增加。具体来说,在末次盛冰期(LGM)的后期(约21-20 ka),邦纳维尔湖在大约9.5°C的温度下接近其最高水位,但仅比现代潮湿7%。当湖泊达到洪水前的Bonneville水位(约18.2-17.5 ka)时,气候条件比现代潮湿约16%,温度低约9°C。比卡15-14.8 ka,在约21%的湿润和约7°C的冷却条件下,Bonneville湖放弃了溢出的普罗沃水平。这些结果表明,区域末次盛冰期高位不是由降水量的大幅增加造成的,而是由一个气候最佳条件造成的,在这个条件下,适度的湿度与低迷的温度相结合,创造了一个积极的水文收支。后来的高点在海因里希我从17至15万年可能实现下逐渐增加的降水量,在15万年后过渡到干燥的条件。
This study uses a hydrologic‐balance model to evaluate the range of precipitation and temperature (P‐T) conditions required to sustain Lake Bonneville at two lake levels during the late Pleistocene. Intersection with a second set of P‐T curves determined from glacial modelling in the nearby Wasatch Mountains places tighter climatic constraints that suggest gradually increasing wetness from ~21 to 15 ka. Specifically, during the latter part of the Last Glacial Maximum (LGM) (~21–20 ka), Lake Bonneville approached its highest level under conditions roughly 9.5°C colder but only 7% wetter than modern. As the lake reached its pre‐flood Bonneville level (~18.2–17.5 ka), climate conditions were ~16% wetter and ~9°C colder than modern. Byca. 15–14.8 ka, Lake Bonneville abandoned the overflowing Provo level under conditions that were ~21% wetter and ~7°C cooler. These results suggest that regional LGM highstands were not caused by large increases in precipitation, but rather by a climatic optimum in which moderate wetness combined with depressed temperatures to create a positive hydrologic budget. Later highstands during Heinrich I from 17 to 15 ka were likely achieved under gradual increases in precipitation, prior to a transition to drier conditions after 15 ka.
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发表时间: 2005
影响因子: 2.3
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发表时间: 1999
期刊: Miscellaneous Field Studies Map
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DOI: --
发表时间: 2016
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