| DOI: | 10.5194/tc-15-863-2021
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| 论文题名: | First investigation of perennial ice in Winter Wonderland Cave, Uinta Mountains, Utah, USA |
| 作者: | S. Munroe J.
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| 刊名: | Cryosphere
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| ISSN: | 19940416
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| 出版年: | 2021
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| 卷: | 15, 期:2 | | 起始页码: | 863
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| 结束页码: | 881
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| 语种: | 英语
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| 英文关键词: | air temperature
; cave
; eolian deposit
; ice
; infiltration
; limestone
; paleoclimate
; precipitation (climatology)
; radiocarbon dating
; relative abundance
; rodent
; sea level
; shoreline
; stable isotope
; winter
; Rocky Mountains
; Uinta Mountains
; United States
; Utah
; Rodentia
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| 英文摘要: | Winter Wonderland Cave is a solution cave at an elevation of 3140m above sea level in Carboniferousage Madison Limestone on the southern slope of the Uinta Mountains (Utah, USA). Temperature data loggers reveal that the mean annual air temperature (MAAT) in the main part of the cave is-0.8 C, whereas the entrance chamber has a MAAT of-2.3 C. In contrast, the MAAT outside the cave entrance was C2.8 C between August 2016 and August 2018. Temperatures in excess of 0 C were not recorded inside the cave during that 2-year interval. About half of the accessible cave, which has a mapped length of 245 m, is floored by perennial ice. Field and laboratory investigations were conducted to determine the age and origin of this ice and its possible paleoclimate significance. Groundpenetrating-radar (GPR) surveys with a 400MHz antenna reveal that the ice has a maximum thickness of 3 m. Samples of rodent droppings obtained from an intermediate depth within the ice yielded radiocarbon ages from 4030 to 28512 years. These results correspond with median calibrated ages from CE 1560 to 1830, suggesting that at least some of the ice accumulated during the Little Ice Age. Samples collected from a2mhigh exposure of layered ice were analyzed for stable isotopes and glaciochemistry. Most values of 18O and D plot subparallel to the global meteoric waterline with a slope of 7.5 and an intercept of 0.03 . Values from some individual layers depart from the local waterline, suggesting that they formed during closed-system freezing. In general, values of both 18O and D are lowest in the deepest ice and highest at the top. This trend is interpreted as a shift in the relative abundance of winter and summer precipitation over time. Calcium has the highest average abundance of cations detectable in the ice (mean of 6050 ppb), followed by Al (2270 ppb), Mg (830 ppb), and K (690 ppb). Most elements are more abundant in the younger ice, possibly reflecting reduced rates of infiltration that prolonged water rock contact in the epikarst. Abundances of Al and Ni likely reflect eolian dust incorporated in the ice. Liquid water appeared in the cave in August 2018 and August 2019, apparently for the first time in many years. This could be a sign of a recent change in the cave environment. © 2021 Massachussetts Medical Society. All rights reserved. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/164797
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| Appears in Collections: | 气候变化与战略
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作者单位: | Geology Department, Middlebury College, Middlebury, VT 05753, United States
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| Recommended Citation: | |
S. Munroe J.. First investigation of perennial ice in Winter Wonderland Cave, Uinta Mountains, Utah, USA[J]. Cryosphere,2021-01-01,15(2)
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