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...
Published in: | Geophysical Research Letters |
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Language: | English |
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American Geophysical Union
2021
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Online Access: | http://nora.nerc.ac.uk/id/eprint/529792/ https://nora.nerc.ac.uk/id/eprint/529792/1/2021GL092692.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL092692 |
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ftnerc:oai:nora.nerc.ac.uk:529792 2023-05-15T13:41:45+02:00 Deriving melt rates at a complex ice shelf base using in-situ radar: Application to Totten Ice Shelf Vaňková, Irena Cook, Sue Winberry, Jeremy Nicholls, Keith W. Galton-Fenzi, Benjamin K. 2021-04-16 text http://nora.nerc.ac.uk/id/eprint/529792/ https://nora.nerc.ac.uk/id/eprint/529792/1/2021GL092692.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL092692 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/529792/1/2021GL092692.pdf Vaňková, Irena orcid:0000-0003-4351-3781 Cook, Sue; Winberry, Jeremy; Nicholls, Keith W. orcid:0000-0002-2188-4509 Galton-Fenzi, Benjamin K. 2021 Deriving melt rates at a complex ice shelf base using in-situ radar: Application to Totten Ice Shelf. Geophysical Research Letters, 47 (7), e2021GL092692. 10, pp. https://doi.org/10.1029/2021GL092692 <https://doi.org/10.1029/2021GL092692> cc_by_4 CC-BY Publication - Article PeerReviewed 2021 ftnerc https://doi.org/10.1029/2021GL092692 2023-02-04T19:51:49Z 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 Ice Shelf Totten Ice Shelf Natural Environment Research Council: NERC Open Research Archive Antarctic Geophysical Research Letters 48 7 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
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 |
Vaňková, Irena Cook, Sue Winberry, Jeremy Nicholls, Keith W. Galton-Fenzi, Benjamin K. |
spellingShingle |
Vaňková, Irena Cook, Sue Winberry, Jeremy Nicholls, Keith W. Galton-Fenzi, Benjamin K. Deriving melt rates at a complex ice shelf base using in-situ radar: Application to Totten Ice Shelf |
author_facet |
Vaňková, Irena Cook, Sue Winberry, Jeremy Nicholls, Keith W. Galton-Fenzi, Benjamin K. |
author_sort |
Vaňková, Irena |
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 |
American Geophysical Union |
publishDate |
2021 |
url |
http://nora.nerc.ac.uk/id/eprint/529792/ https://nora.nerc.ac.uk/id/eprint/529792/1/2021GL092692.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL092692 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Ice Shelf Totten Ice Shelf |
genre_facet |
Antarc* Antarctic Ice Shelf Totten Ice Shelf |
op_relation |
https://nora.nerc.ac.uk/id/eprint/529792/1/2021GL092692.pdf Vaňková, Irena orcid:0000-0003-4351-3781 Cook, Sue; Winberry, Jeremy; Nicholls, Keith W. orcid:0000-0002-2188-4509 Galton-Fenzi, Benjamin K. 2021 Deriving melt rates at a complex ice shelf base using in-situ radar: Application to Totten Ice Shelf. Geophysical Research Letters, 47 (7), e2021GL092692. 10, pp. https://doi.org/10.1029/2021GL092692 <https://doi.org/10.1029/2021GL092692> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2021GL092692 |
container_title |
Geophysical Research Letters |
container_volume |
48 |
container_issue |
7 |
_version_ |
1766157314801270784 |