Anthropogenic influence on surface changes at the Olivares glaciers; Central Chile.
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...
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ftunivbern:oai:boris.unibe.ch:169268 2024-05-12T08:05:12+00:00 Anthropogenic influence on surface changes at the Olivares glaciers; Central Chile. Barandun, Martina Bravo, Claudio Grobety, Bernard Jenk, Theo Fang, Ling Naegeli, Kathrin Rivera, Andrés Cisternas, Sebastián Münster, Tatjana Schwikowski, Margit 2022-08-10 application/pdf https://boris.unibe.ch/169268/1/1-s2.0-S0048969722021611-main.pdf https://boris.unibe.ch/169268/ eng eng Elsevier https://boris.unibe.ch/169268/ info:eu-repo/semantics/openAccess Barandun, Martina; Bravo, Claudio; Grobety, Bernard; Jenk, Theo; Fang, Ling; Naegeli, Kathrin; Rivera, Andrés; Cisternas, Sebastián; Münster, Tatjana; Schwikowski, Margit (2022). Anthropogenic influence on surface changes at the Olivares glaciers; Central Chile. The Science of the total environment, 833, p. 155068. Elsevier 10.1016/j.scitotenv.2022.155068 <http://dx.doi.org/10.1016/j.scitotenv.2022.155068> 550 Earth sciences & geology 910 Geography & travel info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2022 ftunivbern https://doi.org/10.1016/j.scitotenv.2022.155068 2024-04-17T14:40:12Z 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 particles with strong light-absorbing capacity have been mobilized from mine tailings and deposited on the nearby glacier surfaces. Large-scale assessment from satellite-based observations revealed darkening (ice albedo lowering) at most investigated glacier tongues from 1989 to 2018. Glacier melt is sensitive to ice albedo. We believe that an accelerated winter and spring snow albedo decrease, partially triggered by surface impurities, might be responsible for the above-average mass loss encountered in this catchment. Article in Journal/Newspaper ice core BORIS (Bern Open Repository and Information System, University of Bern) Olivares ENVELOPE(-56.983,-56.983,-63.400,-63.400) Science of The Total Environment 833 155068 |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
topic |
550 Earth sciences & geology 910 Geography & travel |
spellingShingle |
550 Earth sciences & geology 910 Geography & travel Barandun, Martina Bravo, Claudio Grobety, Bernard Jenk, Theo Fang, Ling Naegeli, Kathrin Rivera, Andrés Cisternas, Sebastián Münster, Tatjana Schwikowski, Margit Anthropogenic influence on surface changes at the Olivares glaciers; Central Chile. |
topic_facet |
550 Earth sciences & geology 910 Geography & travel |
description |
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 particles with strong light-absorbing capacity have been mobilized from mine tailings and deposited on the nearby glacier surfaces. Large-scale assessment from satellite-based observations revealed darkening (ice albedo lowering) at most investigated glacier tongues from 1989 to 2018. Glacier melt is sensitive to ice albedo. We believe that an accelerated winter and spring snow albedo decrease, partially triggered by surface impurities, might be responsible for the above-average mass loss encountered in this catchment. |
format |
Article in Journal/Newspaper |
author |
Barandun, Martina Bravo, Claudio Grobety, Bernard Jenk, Theo Fang, Ling Naegeli, Kathrin Rivera, Andrés Cisternas, Sebastián Münster, Tatjana Schwikowski, Margit |
author_facet |
Barandun, Martina Bravo, Claudio Grobety, Bernard Jenk, Theo Fang, Ling Naegeli, Kathrin Rivera, Andrés Cisternas, Sebastián Münster, Tatjana Schwikowski, Margit |
author_sort |
Barandun, Martina |
title |
Anthropogenic influence on surface changes at the Olivares glaciers; Central Chile. |
title_short |
Anthropogenic influence on surface changes at the Olivares glaciers; Central Chile. |
title_full |
Anthropogenic influence on surface changes at the Olivares glaciers; Central Chile. |
title_fullStr |
Anthropogenic influence on surface changes at the Olivares glaciers; Central Chile. |
title_full_unstemmed |
Anthropogenic influence on surface changes at the Olivares glaciers; Central Chile. |
title_sort |
anthropogenic influence on surface changes at the olivares glaciers; central chile. |
publisher |
Elsevier |
publishDate |
2022 |
url |
https://boris.unibe.ch/169268/1/1-s2.0-S0048969722021611-main.pdf https://boris.unibe.ch/169268/ |
long_lat |
ENVELOPE(-56.983,-56.983,-63.400,-63.400) |
geographic |
Olivares |
geographic_facet |
Olivares |
genre |
ice core |
genre_facet |
ice core |
op_source |
Barandun, Martina; Bravo, Claudio; Grobety, Bernard; Jenk, Theo; Fang, Ling; Naegeli, Kathrin; Rivera, Andrés; Cisternas, Sebastián; Münster, Tatjana; Schwikowski, Margit (2022). Anthropogenic influence on surface changes at the Olivares glaciers; Central Chile. The Science of the total environment, 833, p. 155068. Elsevier 10.1016/j.scitotenv.2022.155068 <http://dx.doi.org/10.1016/j.scitotenv.2022.155068> |
op_relation |
https://boris.unibe.ch/169268/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.scitotenv.2022.155068 |
container_title |
Science of The Total Environment |
container_volume |
833 |
container_start_page |
155068 |
_version_ |
1798847458843820032 |