DOI: 10.5194/tc-10-1495-2016
Scopus记录号: 2-s2.0-84978791348
论文题名: Design of a scanning laser meter for monitoring the spatio-temporal evolution of snow depth and its application in the Alps and in Antarctica
作者: Picard G ; , Arnaud L ; , Panel J ; M ; , Morin S
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 4 起始页码: 1495
结束页码: 1511
语种: 英语
英文关键词: accuracy assessment
; automation
; depth
; design
; heterogeneity
; installation
; instrumentation
; laser method
; monitoring system
; precision
; scanner
; snow cover
; spatiotemporal analysis
; Alps
; Antarctica
; Dome Concordia
; East Antarctica
; France
英文摘要: Although both the temporal and spatial variations of the snow depth are usually of interest for numerous applications, available measurement techniques are either space-oriented (e.g. terrestrial laser scans) or time-oriented (e.g. ultrasonic ranging probe). Because of snow heterogeneity, measuring depth in a single point is insufficient to provide accurate and representative estimates. We present a cost-effective automatic instrument to acquire spatio-temporal variations of snow depth. The device comprises a laser meter mounted on a 2-axis stage and can scan 200000 points over an area of 100-200m2 in 4h. Two instruments, installed in Antarctica (Dome C) and the French Alps (Col de Porte), have been operating continuously and unattended over 2015 with a success rate of 65 and 90% respectively. The precision of single point measurements and long-term stability were evaluated to be about 1cm and the accuracy to be 5cm or better. The spatial variability in the scanned area reached 7-10cm (root mean square) at both sites, which means that the number of measurements is sufficient to average out the spatial variability and yield precise mean snow depth. With such high precision, it was possible for the first time at Dome C to (1) observe a 3-month period of regular and slow increase of snow depth without apparent link to snowfalls and (2) highlight that most of the annual accumulation stems from a single event although several snowfall and strong wind events were predicted by the ERA-Interim reanalysis. Finally the paper discusses the benefit of laser scanning compared to multiplying single-point sensors in the context of monitoring snow depth. © 2016 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75113
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: CNRS, Laboratoire de Glaciologie et Geóphysique de l'Environnement (LGGE), UMR 5183, Grenoble, France; ACE CRC, University of Tasmania, Private Bag 80, Hobart, TAS, Australia; Méteó-France, CNRS, Centre d'Études de la Neige, Grenoble, France
Recommended Citation:
Picard G,, Arnaud L,, Panel J,et al. Design of a scanning laser meter for monitoring the spatio-temporal evolution of snow depth and its application in the Alps and in Antarctica[J]. Cryosphere,2016-01-01,10(4)