Distributed modeling of ablation (1996–2011) and climate sensitivity on the glaciers of Taylor Valley, Antarctica

Hoffman, Matthew J.; Fountain, Andrew G.; Liston, Glen E.

doi:10.1017/jog.2015.2

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

i

Distributed modeling of ablation (1996–2011) and climate sensitivity on the glaciers of Taylor Valley, Antarctica

2016
By Hoffman, Matthew J. ; Fountain, Andrew G. ; Liston, Glen E.
Source: Journal of Glaciology, 62(232), 215-229

[PDF-1.07 MB]

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Journal Title:

Journal of Glaciology
Personal Author:

Hoffman, Matthew J. ; Fountain, Andrew G. ; Liston, Glen E.

Hoffman, Matthew J. ; Fountain, Andrew G. ; Liston, Glen E. Less -
NOAA Program & Office:

CIRA (Cooperative Institute for Research in the Atmosphere)
Description:

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.
Source:

Journal of Glaciology, 62(232), 215-229
DOI:

https://doi.org/10.1017/jog.2015.2
ISSN:

0022-1430;1727-5652;
Format:

pdf
Publisher:

Cambridge University Press (CUP)
Document Type:

Journal Article
License:

https://creativecommons.org/licenses/by-nc-sa/4.0
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CC BY-NC-SA
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urn:sha-512:99e150ec12f4783cf3d7be1f7dd8b1b8860fbf65a5090dbe4d292f9efd5acbb82e77ea166dff10c69893268bc1f6fa46623c127368fd86fa956ca28e60f81fb0
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Distributed modeling of ablation (1996–2011) and climate sensitivity on the glaciers of Taylor Valley, Antarctica

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