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Article
Distributed Modeling of Ablation (1996–2011) and Climate Sensitivity on the Glaciers of Taylor Valley, Antarctica
Journal of Glaciology
  • Matthew J. Hoffman, Los Alamos National Laboratory
  • Andrew G. Fountain, Portland State University
  • Glen E. Liston, Colorado State University - Fort Collins
Document Type
Article
Publication Date
2-1-2016
Subjects
  • McMurdo Dry Valleys (Antarctica),
  • Glaciers -- Ecological aspects,
  • Glaciers -- Antarctica -- Taylor Valley,
  • Ablation (Aerothermodynamics)
Abstract
The McMurdo Dry Valleys of Antarctica host the coldest and driest ecosystem on Earth, which is acutely sensitive to the availability of water coming from glacial runoff. We modeled the spatial variability in ablation and assessed climate sensitivity of the glacier ablation zones using 16 years of meteorological and surface mass-balance observations collected in Taylor Valley. Sublimation was the primary form of mass loss over much of the ablation zones, except for near the termini where melt, primarily below the surface, dominated. Microclimates in ~10 m scale topographic basins generated melt rates up to ten times higher than over smooth glacier surfaces. In contrast, the vertical terminal cliffs on the glaciers can have higher or lower melt rates than the horizontal surfaces due to differences in incoming solar radiation. The model systematically underpredicted ablation for the final 5 years studied, possibly due to an increase of windblown sediment. Surface mass-balance sensitivity to temperature was ~−0.02 m w.e. K−1, which is among the smallest magnitudes observed globally. We also identified a high sensitivity to ice albedo, with a decrease of 0.02 having similar effects as a 1 K increase in temperature, and a complex sensitivity to wind speed.
Description

© The Author(s) 2016 This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike licence (http://creativecommons.org/licenses/by-nc-sa/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the same Creative Commons licence is included and the original work is properly cited.

DOI
10.1017/ jog.2015.2
Persistent Identifier
http://archives.pdx.edu/ds/psu/17276
Citation Information
MATTHEW J. HOFFMAN, ANDREW G. FOUNTAIN and GLEN E. LISTON (2016). Distributed modeling of ablation (1996–2011) and climate sensitivity on the glaciers of Taylor Valley, Antarctica. Journal of Glaciology.