DOI: 10.1016/j.jag.2013.07.006
Scopus记录号: 2-s2.0-84897570878
论文题名: Where does a glacier end? GPR measurements to identify the limits between valley slopes and actual glacier body. Application to the Austre Lovénbreen, Spitsbergen
作者: Bernard É ; , Friedt J ; M ; , Saintenoy A ; , Tolle F ; , Griselin M ; , Marlin C
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2014
卷: 27, 期: PARTA 起始页码: 100
结束页码: 108
语种: 英语
英文关键词: Arctic
; Glacier limit
; Ground penetrating Radar
; Polar glacier
; Spitsbergen
Scopus关键词: aerial photography
; debris flow
; digital elevation model
; glacier dynamics
; ground penetrating radar
; ice thickness
; measurement method
; remote sensing
; satellite imagery
; spatial analysis
; Arctic
; Austre Lovenbreen
; Spitsbergen
; Svalbard
; Svalbard and Jan Mayen
英文摘要: Glacier limits are usually mapped according to a spatial discrimination based on color of remote sensing images or aerial photography. What appears like ice (white or light colored areas) at the end of the ablation period (end of summer) corresponds to the glacier, while what appears as rock (dark areas) is identified as the slope. This kind of visual discretization seems to be insufficient in the case of small arctic glaciers. Indeed, the slopes have been described as very unstable parts of glacial basins. Debris are generated by the inclination of the slopes, and reach the glacier surface. Thus, the visible limit does not correspond to the ice extension: a significant amount of ice is potentially covered by rock debris, enlarging the actual glacier surface with respect to the observed area. Hence, we apply Ground Penetrating Radar (GPR) measurements for mapping, beyond the central parts of the glacier, the steep slopes of the Austre Lovénbreen (Spitsbergen, 79° N). The aim is to assess the discrepancy between the limits extracted from remote sensing methods - aerial photography, satellite images and derived digital elevation models - and the GPR data which exhibit significant ice thickness at locations considered outside the glacier itself. The ice is observed to extend typically from 25 to 30 m, and up to 100 m, under the slopes. These measurements allow for a new determination of the rock/ice interface location following criteria beyond the visual and morphological characteristics seen from the surface, as obtained by remote sensing techniques or in-situ observations. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79620
Appears in Collections: 气候变化事实与影响
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作者单位: ThéMA, CNRS/Université de Franche-Comté, UMR 6049, Besançon, France; FEMTO-ST, CNRS/Université de Franche Comté, UMR 6174, Besançon, France; IDES, CNRS/Université Paris Sud, UMR 8148, Orsay, France
Recommended Citation:
Bernard É,, Friedt J,M,et al. Where does a glacier end? GPR measurements to identify the limits between valley slopes and actual glacier body. Application to the Austre Lovénbreen, Spitsbergen[J]. International Journal of Applied Earth Observation and Geoinformation,2014-01-01,27(PARTA)