TY - JOUR
T1 - Supraglacial debris thickness and supply rate in High-Mountain Asia
AU - McCarthy, Michael
AU - Miles, Evan
AU - Kneib, Marin
AU - Buri, Pascal
AU - Fugger, Stefan
AU - Pellicciotti, Francesca
N1 - Funding Information: This study would not have been possible without the in-situ supraglacial debris thickness data we used for validation, from colleagues including Bhanu Pratap, Lavkush Patel, and from the Zenodo Community of the IACS Working Group on Debris Covered Glaciers. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program grant agreement No 772751, RAVEN, "Rapid mass losses of debris-covered glaciers in High Mountain Asia”.
PY - 2022/11/5
Y1 - 2022/11/5
N2 - Supraglacial debris strongly modulates glacier melt rates and can be decisive for ice dynamics and mountain hydrology. It is ubiquitous in High-Mountain Asia, yet because its thickness and supply rate from local topography are poorly known, our ability to forecast regional glacier change and streamflow is limited. Here we combined remote sensing and numerical modelling to resolve supraglacial debris thickness by altitude for 4689 glaciers in High-Mountain Asia, and debris-supply rate to 4141 of those glaciers. Our results reveal extensively thin supraglacial debris and high spatial variability in both debris thickness and supply rate. Debris-supply rate increases with the temperature and slope of debris-supply slopes regionally, and debris thickness increases as ice flow decreases locally. Our centennial-scale estimates of debris-supply rate are typically an order of magnitude or more lower than millennial-scale estimates of headwall-erosion rate from Beryllium-10 cosmogenic nuclides, potentially reflecting episodic debris supply to the region’s glaciers.
AB - Supraglacial debris strongly modulates glacier melt rates and can be decisive for ice dynamics and mountain hydrology. It is ubiquitous in High-Mountain Asia, yet because its thickness and supply rate from local topography are poorly known, our ability to forecast regional glacier change and streamflow is limited. Here we combined remote sensing and numerical modelling to resolve supraglacial debris thickness by altitude for 4689 glaciers in High-Mountain Asia, and debris-supply rate to 4141 of those glaciers. Our results reveal extensively thin supraglacial debris and high spatial variability in both debris thickness and supply rate. Debris-supply rate increases with the temperature and slope of debris-supply slopes regionally, and debris thickness increases as ice flow decreases locally. Our centennial-scale estimates of debris-supply rate are typically an order of magnitude or more lower than millennial-scale estimates of headwall-erosion rate from Beryllium-10 cosmogenic nuclides, potentially reflecting episodic debris supply to the region’s glaciers.
UR - https://www.scopus.com/pages/publications/85141413415
U2 - 10.1038/s43247-022-00588-2
DO - 10.1038/s43247-022-00588-2
M3 - Article
AN - SCOPUS:85141413415
SN - 2662-4435
VL - 3
SP - 1
EP - 11
JO - Communications Earth and Environment
JF - Communications Earth and Environment
IS - 1
M1 - 269
ER -