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Supraglacial Ice Cliffs Can Substantially Increase the Mass Loss of Debris‐Covered Glaciers
Author(s) -
Buri Pascal,
Miles Evan S.,
Steiner Jakob F.,
Ragettli Silvan,
Pellicciotti Francesca
Publication year - 2021
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl092150
Subject(s) - glacier , debris , thinning , geology , glacier mass balance , drainage basin , glacier ice accumulation , physical geography , geomorphology , glacier morphology , mass movement , hydrology (agriculture) , ice stream , climatology , cryosphere , landslide , geography , oceanography , sea ice , cartography , geotechnical engineering , forestry
The thinning patterns of debris‐covered glaciers in High Mountain Asia are not well understood. Here we calculate the effect of supraglacial ice cliffs on the mass balance of all glaciers in a Himalayan catchment, using a process‐based ice cliff melt model. We show that ice cliffs are responsible for higher than expected thinning rates of debris‐covered glacier tongues, leading to an underestimation of their ice mass loss of 17% ± 4% in the catchment if not considered. We also show that cliffs do enhance melt where other processes would suppress it, that is, at high elevations, or where debris is thick, and that they contribute relatively more to glacier mass loss if oriented north. Our approach provides a key contribution to our understanding of the mass losses of debris‐covered glaciers, and a new quantification of their catchment wide melt and mass balance.