Deriving melt rates at a complex ice shelf base using in-situ radar: application to Totten Ice Shelf
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...
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Amer Geophysical Union
2021
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ftunivtasmania:oai:eprints.utas.edu.au:40551 2023-05-15T13:42:40+02:00 Deriving melt rates at a complex ice shelf base using in-situ radar: application to Totten Ice Shelf Vankova, I Cook, S Winberry, JP Nicholls, KW Galton-Fenzi, BK 2021 application/pdf https://eprints.utas.edu.au/40551/ https://eprints.utas.edu.au/40551/1/143510%20-%20Deriving%20melt%20rates%20at%20a%20complex%20ice%20shelf%20base%20using%20in-situ%20radar.pdf en eng Amer Geophysical Union https://eprints.utas.edu.au/40551/1/143510%20-%20Deriving%20melt%20rates%20at%20a%20complex%20ice%20shelf%20base%20using%20in-situ%20radar.pdf Vankova, I, Cook, S orcid:0000-0001-9878-4218 , Winberry, JP, Nicholls, KW and Galton-Fenzi, BK 2021 , 'Deriving melt rates at a complex ice shelf base using in-situ radar: application to Totten Ice Shelf' , Geophysical Research Letters, vol. 48, no. 7 , pp. 1-10 , doi:10.1029/2021GL092692 <http://dx.doi.org/10.1029/2021GL092692>. ice shelves basal melt Antarctica ground-based radar Totten Glacier Article PeerReviewed 2021 ftunivtasmania https://doi.org/10.1029/2021GL092692 2022-01-24T23:18:13Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Totten Glacier Totten Ice Shelf University of Tasmania: UTas ePrints Antarctic Totten Glacier ENVELOPE(116.333,116.333,-66.833,-66.833) Geophysical Research Letters 48 7 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
ice shelves basal melt Antarctica ground-based radar Totten Glacier |
spellingShingle |
ice shelves basal melt Antarctica ground-based radar Totten Glacier Vankova, I Cook, S Winberry, JP Nicholls, KW Galton-Fenzi, BK Deriving melt rates at a complex ice shelf base using in-situ radar: application to Totten Ice Shelf |
topic_facet |
ice shelves basal melt Antarctica ground-based radar Totten Glacier |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Vankova, I Cook, S Winberry, JP Nicholls, KW Galton-Fenzi, BK |
author_facet |
Vankova, I Cook, S Winberry, JP Nicholls, KW Galton-Fenzi, BK |
author_sort |
Vankova, I |
title |
Deriving melt rates at a complex ice shelf base using in-situ radar: application to Totten Ice Shelf |
title_short |
Deriving melt rates at a complex ice shelf base using in-situ radar: application to Totten Ice Shelf |
title_full |
Deriving melt rates at a complex ice shelf base using in-situ radar: application to Totten Ice Shelf |
title_fullStr |
Deriving melt rates at a complex ice shelf base using in-situ radar: application to Totten Ice Shelf |
title_full_unstemmed |
Deriving melt rates at a complex ice shelf base using in-situ radar: application to Totten Ice Shelf |
title_sort |
deriving melt rates at a complex ice shelf base using in-situ radar: application to totten ice shelf |
publisher |
Amer Geophysical Union |
publishDate |
2021 |
url |
https://eprints.utas.edu.au/40551/ https://eprints.utas.edu.au/40551/1/143510%20-%20Deriving%20melt%20rates%20at%20a%20complex%20ice%20shelf%20base%20using%20in-situ%20radar.pdf |
long_lat |
ENVELOPE(116.333,116.333,-66.833,-66.833) |
geographic |
Antarctic Totten Glacier |
geographic_facet |
Antarctic Totten Glacier |
genre |
Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Totten Glacier Totten Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Totten Glacier Totten Ice Shelf |
op_relation |
https://eprints.utas.edu.au/40551/1/143510%20-%20Deriving%20melt%20rates%20at%20a%20complex%20ice%20shelf%20base%20using%20in-situ%20radar.pdf Vankova, I, Cook, S orcid:0000-0001-9878-4218 , Winberry, JP, Nicholls, KW and Galton-Fenzi, BK 2021 , 'Deriving melt rates at a complex ice shelf base using in-situ radar: application to Totten Ice Shelf' , Geophysical Research Letters, vol. 48, no. 7 , pp. 1-10 , doi:10.1029/2021GL092692 <http://dx.doi.org/10.1029/2021GL092692>. |
op_doi |
https://doi.org/10.1029/2021GL092692 |
container_title |
Geophysical Research Letters |
container_volume |
48 |
container_issue |
7 |
_version_ |
1766170935196385280 |