Anthropogenic influence on surface changes at the Olivares glaciers; Central Chile. ...

• Main Authors: Barandun, Martina, Bravo, Claudio, Grobety, Bernard, Jenk, Theo, Fang, Ling, Naegeli, Kathrin, Rivera, Andrés, Cisternas, Sebastián, Münster, Tatjana, Schwikowski, Margit
• Format: Text
• Language: unknown
• Published: Elsevier 2022
• Subjects: 550 Earth sciences & geology; 910 Geography & travel; Olivares; ice core
• Online Access: https://dx.doi.org/10.48350/169268; https://boris.unibe.ch/169268/

We have investigated the source and role of light-absorbing impurities (LAIs) deposited on the glaciers of the Olivares catchment, in Central Chile. LAIs can considerably darken (lowered albedo) the glacier surface, enhancing their melt. We combined chemical and mineralogical laboratory analyses of surface and ice core samples with field-based spectral reflectance measurements to investigate the nature and properties of such LAIs. Using remote sensing-based albedo maps, we upscaled local information to glacier-wide coverage. We then used a model to evaluate the sensitivity of surface mass balance to a change in ice and snow albedo. The across-scale surface observations in combination with ice core analysis revealed a history of over half a century of LAIs deposition. We found traces of mining residuals in glacier surface samples. The glaciers with highest mass loss in the catchment present enhanced concentrations of surface dust particles with low reflectance properties. Our results indicate that dust ...