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Local topography increasingly influences the mass balance of a retreating cirque glacier

The Cryosphere

By:
https://doi.org/10.5194/tc-12-2109-2018

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Abstract

Local topographically driven processes – such as wind drifting, avalanching, and shading – are known to alter the relationship between the mass balance of small cirque glaciers and regional climate. Yet partitioning such local effects from regional climate influence has proven difficult, creating uncertainty in the climate representativeness of some glaciers. We address this problem for Sperry Glacier in Glacier National Park, USA, using field-measured surface mass balance, geodetic constraints on mass balance, and regional climate data recorded at a network of meteorological and snow stations. Geodetically derived mass changes during 1950–1960, 1960–2005, and 2005–2014 document average mass change rates during each period at −0.22 ± 0.12, −0.18 ± 0.05, and −0.10 ± 0.03 m w.e. yr−1, respectively. A correlation of field-measured mass balance and regional climate variables closely (i.e., within 0.08 m w.e. yr−1) predicts the geodetically measured mass loss from 2005 to 2014. However, this correlation overestimates glacier mass balance for 1950–1960 by +1.20 ± 0.95 m w.e. yr−1. Our analysis suggests that local effects, not represented in regional climate variables, have become a more dominant driver of the net mass balance as the glacier lost 0.50 km2 and retreated further into its cirque.

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Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Local topography increasingly influences the mass balance of a retreating cirque glacier
Series title:
The Cryosphere
DOI:
10.5194/tc-12-2109-2018
Volume:
12
Year Published:
2018
Language:
English
Publisher:
European Geosciences Union
Contributing office(s):
Northern Rocky Mountain Science Center
Description:
14 p.
First page:
2109
Last page:
2122
Country:
United States
Other Geospatial:
Northern Rocky Mountains