文章基本信息

标题：An optimized method to calculate the geodetic mass balance of mountain glaciers
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作者：RUBÉN BASANTES-SERRANO ; ANTOINE RABATEL ; CHRISTIAN VINCENT 等
期刊名称：Journal of Glaciology
印刷版ISSN：0022-1430
电子版ISSN：1727-5652
出版年度：2018
卷号：64
期号：248
页码：917-931
DOI：10.1017/jog.2018.79
出版社：Cambridge University Press
摘要：Understanding the effects of climate on glaciers requires precise estimates of ice volume change over several decades. This is achieved by the geodetic mass balance computed by two means: (1) the digital elevation model (DEM) comparison (SeqDEM) allows measurements over the entire glacier, however the low contrast over glacierized areas is an issue for the DEM generation through the photogrammetric techniques and (2) the profiling method (SePM) is a faster alternative but fails to capture the spatial variability of elevation changes. We present a new framework (SSD) that relies upon the spatial variability of the elevation change to densify a sampling network to optimize the surface-elevation change quantification. Our method was tested in two small glaciers over different periods. We conclude that the SePM overestimates the elevation change by ~20% with a mean difference of ~1.00 m (root mean square error (RMSE) = ~3.00 m) compared with results from the SeqDEM method. A variogram analysis of the elevation changes showed a mean difference of.
关键词：glacier mass balance;glacier volume;glaciological instruments and methods;remote sensing