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). 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

[img] Text
1-s2.0-S0048969722021611-main.pdf - Accepted Version
Restricted to registered users only until 10 April 2024.
Available under License Publisher holds Copyright.

Download (1MB) | Request a copy

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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)

UniBE Contributor:

Naegeli, Kathrin

Subjects:

500 Science > 550 Earth sciences & geology
900 History > 910 Geography & travel

ISSN:

1879-1026

Publisher:

Elsevier

Language:

English

Submitter:

Pubmed Import

Date Deposited:

13 Apr 2022 11:52

Last Modified:

03 Jun 2022 00:14

Publisher DOI:

10.1016/j.scitotenv.2022.155068

PubMed ID:

35413346

Uncontrolled Keywords:

Glacier albedo across scales Glacier mass balance sensitivity Light-absorbing impurities Mining activities

BORIS DOI:

10.48350/169268

URI:

https://boris.unibe.ch/id/eprint/169268

Actions (login required)

Edit item Edit item
Provide Feedback