DOI: 10.5194/hess-20-1197-2016
Scopus记录号: 2-s2.0-84961672272
论文题名: Stable oxygen isotope variability in two contrasting glacier river catchments in Greenland
作者: Yde J ; C ; , Knudsen N ; T ; , Steffensen J ; P ; , Carrivick J ; L ; , Hasholt B ; , Ingeman-Nielsen T ; , Kronborg C ; , Larsen N ; K ; , Mernild S ; H ; , Oerter H ; , Roberts D ; H ; , Russell A ; J
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2016
卷: 20, 期: 3 起始页码: 1197
结束页码: 1210
语种: 英语
Scopus关键词: Catchments
; Drainage
; Ice
; Isotopes
; Rivers
; Runoff
; Travel time
; Diurnal oscillations
; Drainage networks
; Greenland Ice Sheet
; Hydrograph separation analysis
; Southeast Greenland
; Spatial variations
; Stable oxygen isotopes
; Temperate glaciers
; Water resources
; drainage network
; glacier surge
; hydrology
; ice cap
; meltwater
; oxygen isotope
; peak flow
; river basin
; river water
; runoff
; snowmelt
; spatial variation
; stable isotope
; travel time
; Ammassalik Island
; Arctic
; Disko Island
; Greenland
; Greenland Ice Sheet
; Mittivakkat Glacier
英文摘要: Analysis of stable oxygen isotope (δ18O) characteristics is a useful tool to investigate water provenance in glacier river systems. In order to attain knowledge on the diversity of δ18O variations in Greenlandic rivers, we examined two contrasting glacierised catchments disconnected from the Greenland Ice Sheet (GrIS). At the Mittivakkat Gletscher river, a small river draining a local temperate glacier in southeast Greenland, diurnal oscillations in δ18O occurred with a 3 h time lag to the diurnal oscillations in run-off. The mean annual δ18O was -14.68±0.18‰ during the peak flow period. A hydrograph separation analysis revealed that the ice melt component constituted 82±5% of the total run-off and dominated the observed variations during peak flow in August 2004. The snowmelt component peaked between 10:00 and 13:00 local time, reflecting the long travel time and an inefficient distributed subglacial drainage network in the upper part of the glacier. At the Kuannersuit Glacier river on the island Qeqertarsuaq in west Greenland, the δ18O characteristics were examined after the major 1995-1998 glacier surge event. The mean annual δ18O was -19.47±0.55 ‰. Despite large spatial variations in the δ18O values of glacier ice on the newly formed glacier tongue, there were no diurnal oscillations in the bulk meltwater emanating from the glacier in the post-surge years. This is likely a consequence of a tortuous subglacial drainage system consisting of linked cavities, which formed during the surge event. Overall, a comparison of the δ18O compositions from glacial river water in Greenland shows distinct differences between water draining local glaciers and ice caps (between -23.0 and -13.7 ‰) and the GrIS (between -29.9 and -23.2 ‰). This study demonstrates that water isotope analyses can be used to obtain important information on water sources and the subglacial drainage system structure that is highly desired for understanding glacier hydrology. © Author(s) 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78884
Appears in Collections: 气候变化事实与影响
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作者单位: Faculty of Engineering and Science, Sogn og Fjordane University College, Sogndal, Norway; Department of Geoscience, University of Aarhus, Aarhus, Denmark; Centre for Ice and Climate, University of Copenhagen, Copenhagen, Denmark; School of Geography and water-leeds, University of Leeds, Leeds, United Kingdom; Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark; Arctic Technology Centre, Technical University of Denmark, Kgs. Lyngby, Denmark; Antarctic and Sub-Antarctic Program, Universidad de Magallanes, Punta Arenas, Chile; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; Department of Geography, University of Durham, Durham, United Kingdom; School of Geography, Politics and Sociology, Newcastle University, Newcastle upon Tyne, United Kingdom
Recommended Citation:
Yde J,C,, Knudsen N,et al. Stable oxygen isotope variability in two contrasting glacier river catchments in Greenland[J]. Hydrology and Earth System Sciences,2016-01-01,20(3)