Modeling Glacier Elevation Change from DEM Time SeriesReport as inadecuate




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Department of Geosciences, University of Oslo, P.O. Box 1047, 0316 Oslo, Norway



Current address: Department of Geodesy and Geoinformation, TU Wien, Gußhausstr. 25-29, 1040 Wien, Austria.





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Academic Editors: Richard Gloaguen and Prasad S. Thenkabail

Abstract In this study, a methodology for glacier elevation reconstruction from Digital Elevation Model DEM time series tDEM is described for modeling the evolution of glacier elevation and estimating related volume change, with focus on medium-resolution and noisy satellite DEMs. The method is robust with respect to outliers in individual DEM products. Fox Glacier and Franz Josef Glacier in New Zealand are used as test cases based on 31 Advanced Spaceborne Thermal Emission and Reflection Radiometer ASTER DEMs and the Shuttle Radar Topography Mission SRTM DEM. We obtained a mean surface elevation lowering rate of −0.51 ± 0.02 m·a−1 and −0.09 ± 0.02 m·a−1 between 2000 and 2014 for Fox and Franz Josef Glacier, respectively. The specific volume difference between 2000 and 2014 was estimated as −0.77 ± 0.13 m·a−1 and −0.33 ± 0.06 m·a−1 by our tDEM method. The comparably moderate thinning rates are mainly due to volume gains after 2013 that compensate larger thinning rates earlier in the series. Terminus thickening prevailed between 2002 and 2007. View Full-Text

Keywords: DEM time series; ASTER; elevation change; Fox Glacier; Franz Josef Glacier DEM time series; ASTER; elevation change; Fox Glacier; Franz Josef Glacier





Author: Di Wang † and Andreas Kääb *

Source: http://mdpi.com/



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