DOI: 10.1002/2015GL064106
论文题名: The isotopic composition of the Laurentide Ice Sheet and fossil groundwater
作者: Ferguson G. ; Jasechko S.
刊名: Geophysical Research Letters
ISSN: 0094-8685
EISSN: 1944-8416
出版年: 2015
卷: 42, 期: 12 起始页码: 4856
结束页码: 4861
语种: 英语
英文关键词: general circulation models
; groundwater
; ice sheets
; isotopes
Scopus关键词: Climate models
; Glaciers
; Groundwater
; Isotopes
; Sea level
; General circulation model
; Groundwater system
; Ice sheet
; Isotopic composition
; Laurentide ice sheets
; Pleistocene epoch
; Representative values
; Stable isotopes
; Ice
; fossil
; general circulation model
; groundwater
; isotopic composition
; Laurentide Ice Sheet
; mixing
; oxygen isotope
; Pleistocene
; runoff
; stable isotope
英文摘要: Stable isotopes have been used to study large-scale changes in hydrology during the Pleistocene epoch. Many of these efforts have required an estimate of the δ18O value of runoff generated by melting ice sheets. There is no consensus on representative values. Here we examine δ18O values from fossil groundwater samples and isotope-enabled general circulation models (GCMs) to better understand the isotopic composition of the Laurentide Ice Sheet (LIS). Groundwater δ18O values ranged from -12.5 to -25.3‰ and tended to increase southward. The δ18O precipitation values predicted by GCMs follow a similar trend but increase more steeply southward. The difference in groundwater and GCM output can be explained by invoking movement of glacial ice and meltwater, along with mixing within groundwater systems. Most groundwater δ18O values are higher than an average LIS δ18O value of -25.4 ± 2.5‰ calculated based on estimated ice sheet volumes and sea level data. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84948714909&doi=10.1002%2f2015GL064106&partnerID=40&md5=5dfbc9a315906aefb64c05717986e2f9
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8301
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Civil and Geological Engineering, University of Saskatchewan, Saskatoon, SK, Canada
Recommended Citation:
Ferguson G.,Jasechko S.. The isotopic composition of the Laurentide Ice Sheet and fossil groundwater[J]. Geophysical Research Letters,2015-01-01,42(12).