globalchange  > 影响、适应和脆弱性
DOI: 10.5194/tc-10-1547-2016
Scopus记录号: 2-s2.0-84979208481
论文题名:
An ice-sheet-wide framework for englacial attenuation from ice-penetrating radar data
作者: Jordan T; M; , Bamber J; L; , Williams C; N; , Paden J; D; , Siegert M; J; , Huybrechts P; , Gagliardini O; , Gillet-Chaulet F
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期:4
起始页码: 1547
结束页码: 1570
语种: 英语
英文关键词: algorithm ; basal melting ; englacial process ; ground penetrating radar ; ice core ; ice sheet ; radio wave ; spatial variation ; temperature effect ; thermomechanics ; trade-off ; Arctic ; Greenland ; Greenland Ice Sheet
英文摘要: Radar inference of the bulk properties of glacier beds, most notably identifying basal melting, is, in general, derived from the basal reflection coefficient. On the scale of an ice sheet, unambiguous determination of basal reflection is primarily limited by uncertainty in the englacial attenuation of the radio wave, which is an Arrhenius function of temperature. Existing bed-returned power algorithms for deriving attenuation assume that the attenuation rate is regionally constant, which is not feasible at an ice-sheet-wide scale. Here we introduce a new semi-empirical framework for deriving englacial attenuation, and, to demonstrate its efficacy, we apply it to the Greenland Ice Sheet. A central feature is the use of a prior Arrhenius temperature model to estimate the spatial variation in englacial attenuation as a first guess input for the radar algorithm. We demonstrate regions of solution convergence for two input temperature fields and for independently analysed field campaigns. The coverage achieved is a trade-off with uncertainty and we propose that the algorithm can be "tuned" for discrimination of basal melt (attenuation loss uncertainty ∼ 5 dB). This is supported by our physically realistic ( ∼20 dB) range for the basal reflection coefficient. Finally, we show that the attenuation solution can be used to predict the temperature bias of thermomechanical ice sheet models and is in agreement with known model temperature biases at the Dye 3 ice core. © 2016 Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75110
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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作者单位: Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol, United Kingdom; Center for Remote Sensing of Ice Sheets, University of Kansas, Lawrence, United States; Grantham Institute and Earth Science and Engineering, Imperial College, University of London, London, United Kingdom; Earth System Science and Departement Geografie, Vrije Universiteit Brussel, Brussels, Belgium; Le Laboratoire de Glaciologie et Geophysique de l'Environnement, University Grenoble Alpes, Grenoble, France; Le Laboratoire de Glaciologie et Geophysique de l'Environnement, Centre National de la Recherche Scientifique, Grenoble, France

Recommended Citation:
Jordan T,M,, Bamber J,et al. An ice-sheet-wide framework for englacial attenuation from ice-penetrating radar data[J]. Cryosphere,2016-01-01,10(4)
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