Lidar measurement of surface melt for a temperate Alpine glacier at the seasonal and hourly scales

Détails

Ressource 1Demande d'une copieEtat: Supprimée
Version: de l'auteur
ID Serval
serval:BIB_DAC3B2DD7905
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Lidar measurement of surface melt for a temperate Alpine glacier at the seasonal and hourly scales
Périodique
Journal of Glaciology
Auteur(s)
Gabbud C., Micheletti N., Lane S.N.
ISSN-L
0022-1430
Statut éditorial
Publié
Date de publication
10/2015
Volume
61
Numéro
229
Pages
963-974
Langue
anglais
Résumé
This study shows how a new generation of terrestrial laser scanners can be used to investigate glacier surface ablation and other elements of glacial hydrodynamics at exceptionally high spatial and temporal resolution. The study area is an Alpine valley glacier, Haut Glacier d'Arolla, Switzerland. Here we use an ultra-long-range lidar RIEGL VZ-6000 scanner, having a laser specifically designed for measurement of snow- and ice-cover surfaces. We focus on two timescales: seasonal and daily. Our results show that a near-infrared scanning laser system can provide high-precision elevation change and ablation data from long ranges, and over relatively large sections of the glacier surface. We use it to quantify spatial variations in the patterns of surface melt at the seasonal scale, as controlled by both aspect and differential debris cover. At the daily scale, we quantify the effects of ogive-related differences in ice surface debris content on spatial patterns of ablation. Daily scale measurements point to possible hydraulic jacking of the glacier associated with short-term water pressure rises. This latter demonstration shows that this type of lidar may be used to address subglacial hydrologic questions, in addition to motion and ablation measurements.
Mots-clé
glacier fluctuations, glacier hydrology, glacier modelling, mountain glaciers, remote sensing, terrestrial laser scanning
Web of science
Open Access
Oui
Création de la notice
22/10/2015 11:26
Dernière modification de la notice
09/05/2019 2:05
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