Rapid Formation of an Ice Doline on Amery Ice Shelf, East Antarctica
Surface meltwater accumulating on Antarctic ice shelves can drive fractures through to the ocean and potentially cause their collapse, leading to increased ice discharge from the continent. Implications of increasing surface melt for future ice shelf stability are inadequately understood. The southe...
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Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8365663/ http://www.ncbi.nlm.nih.gov/pubmed/34433993 https://doi.org/10.1029/2020GL091095 |
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ftpubmed:oai:pubmedcentral.nih.gov:8365663 2023-05-15T13:22:00+02:00 Rapid Formation of an Ice Doline on Amery Ice Shelf, East Antarctica Warner, Roland C. Fricker, Helen A. Adusumilli, Susheel Arndt, Philipp Kingslake, Jonathan Spergel, Julian J. 2021-07-14 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8365663/ http://www.ncbi.nlm.nih.gov/pubmed/34433993 https://doi.org/10.1029/2020GL091095 en eng John Wiley and Sons Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8365663/ http://www.ncbi.nlm.nih.gov/pubmed/34433993 http://dx.doi.org/10.1029/2020GL091095 © 2021. The Authors. https://creativecommons.org/licenses/by-nc/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ (https://creativecommons.org/licenses/by-nc/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. CC-BY-NC Geophys Res Lett Research Letter Text 2021 ftpubmed https://doi.org/10.1029/2020GL091095 2021-08-29T00:28:42Z Surface meltwater accumulating on Antarctic ice shelves can drive fractures through to the ocean and potentially cause their collapse, leading to increased ice discharge from the continent. Implications of increasing surface melt for future ice shelf stability are inadequately understood. The southern Amery Ice Shelf has an extensive surface hydrological system, and we present data from satellite imagery and ICESat‐2 showing a rapid surface disruption there in winter 2019, covering ∼60 km(2). We interpret this as an ice‐covered lake draining through the ice shelf, forming an ice doline with a central depression reaching 80 m depth amidst over 36 m uplift. Flexural rebound modeling suggests 0.75 km(3) of water was lost. We observed transient refilling of the doline the following summer with rapid incision of a narrow meltwater channel (20 m wide and 6 m deep). This study demonstrates how high‐resolution geodetic measurements can explore critical fine‐scale ice shelf processes. Text Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves PubMed Central (PMC) Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Antarctic East Antarctica Geophysical Research Letters 48 14 |
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PubMed Central (PMC) |
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ftpubmed |
language |
English |
topic |
Research Letter |
spellingShingle |
Research Letter Warner, Roland C. Fricker, Helen A. Adusumilli, Susheel Arndt, Philipp Kingslake, Jonathan Spergel, Julian J. Rapid Formation of an Ice Doline on Amery Ice Shelf, East Antarctica |
topic_facet |
Research Letter |
description |
Surface meltwater accumulating on Antarctic ice shelves can drive fractures through to the ocean and potentially cause their collapse, leading to increased ice discharge from the continent. Implications of increasing surface melt for future ice shelf stability are inadequately understood. The southern Amery Ice Shelf has an extensive surface hydrological system, and we present data from satellite imagery and ICESat‐2 showing a rapid surface disruption there in winter 2019, covering ∼60 km(2). We interpret this as an ice‐covered lake draining through the ice shelf, forming an ice doline with a central depression reaching 80 m depth amidst over 36 m uplift. Flexural rebound modeling suggests 0.75 km(3) of water was lost. We observed transient refilling of the doline the following summer with rapid incision of a narrow meltwater channel (20 m wide and 6 m deep). This study demonstrates how high‐resolution geodetic measurements can explore critical fine‐scale ice shelf processes. |
format |
Text |
author |
Warner, Roland C. Fricker, Helen A. Adusumilli, Susheel Arndt, Philipp Kingslake, Jonathan Spergel, Julian J. |
author_facet |
Warner, Roland C. Fricker, Helen A. Adusumilli, Susheel Arndt, Philipp Kingslake, Jonathan Spergel, Julian J. |
author_sort |
Warner, Roland C. |
title |
Rapid Formation of an Ice Doline on Amery Ice Shelf, East Antarctica |
title_short |
Rapid Formation of an Ice Doline on Amery Ice Shelf, East Antarctica |
title_full |
Rapid Formation of an Ice Doline on Amery Ice Shelf, East Antarctica |
title_fullStr |
Rapid Formation of an Ice Doline on Amery Ice Shelf, East Antarctica |
title_full_unstemmed |
Rapid Formation of an Ice Doline on Amery Ice Shelf, East Antarctica |
title_sort |
rapid formation of an ice doline on amery ice shelf, east antarctica |
publisher |
John Wiley and Sons Inc. |
publishDate |
2021 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8365663/ http://www.ncbi.nlm.nih.gov/pubmed/34433993 https://doi.org/10.1029/2020GL091095 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) |
geographic |
Amery Amery Ice Shelf Antarctic East Antarctica |
geographic_facet |
Amery Amery Ice Shelf Antarctic East Antarctica |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves |
op_source |
Geophys Res Lett |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8365663/ http://www.ncbi.nlm.nih.gov/pubmed/34433993 http://dx.doi.org/10.1029/2020GL091095 |
op_rights |
© 2021. The Authors. https://creativecommons.org/licenses/by-nc/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ (https://creativecommons.org/licenses/by-nc/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.1029/2020GL091095 |
container_title |
Geophysical Research Letters |
container_volume |
48 |
container_issue |
14 |
_version_ |
1766362778298220544 |