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Deriving melt rates at a complex ice shelf base using in-situ radar: application to Totten Ice Shelf

Citation

Vankova, I and Cook, S and Winberry, JP and Nicholls, KW and Galton-Fenzi, BK, Deriving melt rates at a complex ice shelf base using in-situ radar: application to Totten Ice Shelf, Geophysical Research Letters, 48, (7) Article e2021GL092692. ISSN 0094-8276 (2021) [Refereed Article]


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DOI: doi:10.1029/2021GL092692

Abstract

A phase‐sensitive radar (ApRES) was deployed on Totten Ice Shelf to provide the first in‐situ basal melt estimate at this dynamic East Antarctic ice shelf. Observations of internal ice dynamics at tidal timescales showed that early arrivals from off‐nadir reflectors obscure the true depth of the ice shelf base. Using the observed tidal deformation, the true base was was found to lie at 1910‐1950 m depth, at 350‐400 m greater range than the first reflection from an ice‐ocean interface. The robustness of the basal melt rate estimate was increased by using multiple basal reflections over the radar footprint, yielding a melt rate of 22 2.1 m a−1. The ApRES estimate is over 40% lower than the three existing satellite estimates covering Totten Ice Shelf. This difference in basal melt is dynamically significant and highlights the need for independent melt rate estimates using complementary instrumentation and techniques that rely on different sets of assumptions.

Item Details

Item Type:Refereed Article
Keywords:ice shelves, basal melt, Antarctica, ground-based radar, Totten Glacier
Research Division:Earth Sciences
Research Group:Physical geography and environmental geoscience
Research Field:Glaciology
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Antarctic and Southern Ocean ice dynamics
UTAS Author:Cook, S (Dr Sue Cook)
UTAS Author:Galton-Fenzi, BK (Dr Ben Galton-Fenzi)
ID Code:143510
Year Published:2021
Deposited By:Australian Antarctic Program Partnership
Deposited On:2021-03-22
Last Modified:2021-04-26
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