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 time scales showed that early arrivals from off-nadir reflectors obscure the true depth of the ic...
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ftcwashingtonuni:oai:digitalcommons.cwu.edu:geological_sciences-1147 2023-05-15T13:47:32+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, J. Paul Nicholls, Keith W. Galton-Fenzi, Benjamin K. 2021-03-10T08:00:00Z application/pdf https://digitalcommons.cwu.edu/geological_sciences/147 https://digitalcommons.cwu.edu/cgi/viewcontent.cgi?article=1147&context=geological_sciences unknown ScholarWorks@CWU https://digitalcommons.cwu.edu/geological_sciences/147 https://digitalcommons.cwu.edu/cgi/viewcontent.cgi?article=1147&context=geological_sciences © 2021. The Authors. http://creativecommons.org/licenses/by/4.0/ CC-BY Geological Sciences Faculty Scholarship ApRES basal melt ground-based radar ice shelves Totten Geology Glaciology text 2021 ftcwashingtonuni 2022-10-20T20:30:41Z 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 time scales 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 found to lie at 1,910–1,950-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. Text Antarc* Antarctic Ice Shelf Ice Shelves Totten Ice Shelf Central Washington University: ScholarWorks Antarctic |
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Open Polar |
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Central Washington University: ScholarWorks |
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ftcwashingtonuni |
language |
unknown |
topic |
ApRES basal melt ground-based radar ice shelves Totten Geology Glaciology |
spellingShingle |
ApRES basal melt ground-based radar ice shelves Totten Geology Glaciology Vaňková, Irena Cook, Sue Winberry, J. Paul 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 |
topic_facet |
ApRES basal melt ground-based radar ice shelves Totten Geology Glaciology |
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 time scales 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 found to lie at 1,910–1,950-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 |
Text |
author |
Vaňková, Irena Cook, Sue Winberry, J. Paul Nicholls, Keith W. Galton-Fenzi, Benjamin K. |
author_facet |
Vaňková, Irena Cook, Sue Winberry, J. Paul 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 |
ScholarWorks@CWU |
publishDate |
2021 |
url |
https://digitalcommons.cwu.edu/geological_sciences/147 https://digitalcommons.cwu.edu/cgi/viewcontent.cgi?article=1147&context=geological_sciences |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Ice Shelf Ice Shelves Totten Ice Shelf |
genre_facet |
Antarc* Antarctic Ice Shelf Ice Shelves Totten Ice Shelf |
op_source |
Geological Sciences Faculty Scholarship |
op_relation |
https://digitalcommons.cwu.edu/geological_sciences/147 https://digitalcommons.cwu.edu/cgi/viewcontent.cgi?article=1147&context=geological_sciences |
op_rights |
© 2021. The Authors. http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
_version_ |
1766247276657770496 |