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Using an ultra-long-range terrestrial laser scanner to monitor the net mass balance of Urumqi Glacier No. 1, eastern Tien Shan, China, at the monthly scale.
- Source :
- Journal of Glaciology; Oct2017, Vol. 63 Issue 241, p792-802, 11p
- Publication Year :
- 2017
-
Abstract
- We describe the use of a terrestrial laser scanner (TLS) to monitor the net mass balance of Urumqi Glacier No. 1, eastern Tien Shan. We used an ultra-long-range Riegl VZ®-6000 TLS, which is specially designed for surveying snow- and ice-covered terrain, to create repeated high spatiotemporal resolution DEMs, focusing on the monthly-scale (25 April–28 May 2015) net mass balance. According to the TLS-derived DEMs, the area of Urumqi Glacier No. 1 was 1.558 km2 on 25 April 2015 and the average surface elevation change was 0.225 m. By comparing the results from the use of TLS with the conventional glaciological mass-balance method, the correlation coefficient (R2) between glaciological elevation changes of individual stakes and the TLS-derived geodetic elevation change of corresponding points was 0.85. Considering the uncertainty of both methods, this is a promising result. Using the in situ measured snow densities (snow pits) of the glacier surface, the geodetic net mass balance was 0.074 m w.e., which is slightly positive. The mean uncertainty in the TLS-derived monthly net mass balance was 0.018 m w.e., showing that the TLS surveying system presented accurate and relevant results and is therefore suitable to monitor mass-balance evolution of mountain glaciers. [ABSTRACT FROM PUBLISHER]
- Subjects :
- GLACIERS
MASS budget (Geophysics)
OPTICAL scanners
Subjects
Details
- Language :
- English
- ISSN :
- 00221430
- Volume :
- 63
- Issue :
- 241
- Database :
- Complementary Index
- Journal :
- Journal of Glaciology
- Publication Type :
- Academic Journal
- Accession number :
- 125485668
- Full Text :
- https://doi.org/10.1017/jog.2017.45