Interannual variability in glacier contribution to runoff from a high-elevation Andean catchment: understanding the role of debris cover in glacier hydrology

Burger Acevedo, Flavia, Ayala, Alvaro, Farias, David, Shaw, Thomas E., MacDonell, Shelley, Brock, Benjamin, McPhee, James and Pellicciotti, Francesca (2019) Interannual variability in glacier contribution to runoff from a high-elevation Andean catchment: understanding the role of debris cover in glacier hydrology. Hydrological Processes, 33 (2). pp. 214-229. ISSN 0885-6087

[img]
Preview
Text
Burger et al - Interannual variability in glacier contribution to runoff from a high-elevation Andean catchment AAM.pdf - Accepted Version
Available under License Creative Commons Attribution 4.0.

Download (3MB) | Preview
[img]
Preview
Text
Burger_et_al-2019-Hydrological_Processes.pdf - Published Version
Available under License Creative Commons Attribution 4.0.

Download (2MB) | Preview
Official URL: https://doi.org/10.1002/hyp.13354

Abstract

We present a field‐data rich modelling analysis to reconstruct the climatic forcing, glacier response, and runoff generation from a high‐elevation catchment in central Chile over the period 2000–2015 to provide insights into the differing contributions of debris‐covered and debris‐free glaciers under current and future changing climatic conditions. Model simulations with the physically based glacio‐hydrological model TOPKAPI‐ETH reveal a period of neutral or slightly positive mass balance between 2000 and 2010, followed by a transition to increasingly large annual mass losses, associated with a recent mega drought. Mass losses commence earlier, and are more severe, for a heavily debris‐covered glacier, most likely due to its strong dependence on snow avalanche accumulation, which has declined in recent years. Catchment runoff shows a marked decreasing trend over the study period, but with high interannual variability directly linked to winter snow accumulation, and high contribution from ice melt in dry periods and drought conditions. The study demonstrates the importance of incorporating local‐scale processes such as snow avalanche accumulation and spatially variable debris thickness, in understanding the responses of different glacier types to climate change. We highlight the increased dependency of runoff from high Andean catchments on the diminishing resource of glacier ice during dry years.

Item Type: Article
Uncontrolled Keywords: glacier mass balance, glacio-hydrological modelling, dry Andes of Chile, debris-covered glaciers, glacier runoff
Subjects: F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User: Paul Burns
Date Deposited: 21 Dec 2018 14:57
Last Modified: 22 Mar 2019 10:55
URI: http://nrl.northumbria.ac.uk/id/eprint/37421

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics


Policies: NRL Policies | NRL University Deposit Policy | NRL Deposit Licence