Seasonal land-ice-flow variability in the Antarctic Peninsula
Recent satellite-remote sensing studies have documented the multi-decadal acceleration of the Antarctic Ice Sheet in response to rapid rates of ice-sheet retreat and thinning. Unlike the Greenland Ice Sheet, where historical, high-temporal-resolution satellite and in situ observations have revealed...
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ftcopernicus:oai:publications.copernicus.org:tc101833 2023-05-15T13:38:41+02:00 Seasonal land-ice-flow variability in the Antarctic Peninsula Boxall, Karla Christie, Frazer D. W. Willis, Ian C. Wuite, Jan Nagler, Thomas 2022-10-04 application/pdf https://doi.org/10.5194/tc-16-3907-2022 https://tc.copernicus.org/articles/16/3907/2022/ eng eng doi:10.5194/tc-16-3907-2022 https://tc.copernicus.org/articles/16/3907/2022/ eISSN: 1994-0424 Text 2022 ftcopernicus https://doi.org/10.5194/tc-16-3907-2022 2022-10-10T16:22:41Z Recent satellite-remote sensing studies have documented the multi-decadal acceleration of the Antarctic Ice Sheet in response to rapid rates of ice-sheet retreat and thinning. Unlike the Greenland Ice Sheet, where historical, high-temporal-resolution satellite and in situ observations have revealed distinct changes in land-ice flow within intra-annual timescales, observations of similar seasonal signals are limited in Antarctica. Here, we use high-spatial- and high-temporal-resolution Copernicus Sentinel-1A/B synthetic aperture radar observations acquired between 2014 and 2020 to provide the first evidence for seasonal flow variability of the land ice feeding George VI Ice Shelf (GVIIS), Antarctic Peninsula. Our observations reveal a distinct austral summertime (December–February) speed-up of <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1" display="inline" overflow="scroll" dspmath="mathml"><mrow><mo>∼</mo><mn mathvariant="normal">0.06</mn><mo>±</mo><mn mathvariant="normal">0.005</mn></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="72pt" height="10pt" class="svg-formula" dspmath="mathimg" md5hash="91ac3833b97d79542ad5ebe2ab6d2d24"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tc-16-3907-2022-ie00001.svg" width="72pt" height="10pt" src="tc-16-3907-2022-ie00001.png"/></svg:svg> m d −1 ( ∼ 22±1.8 m yr −1 ) at, and immediately inland of, the grounding line of the glaciers nourishing the ice shelf, which constitutes a mean acceleration of ∼15 % relative to baseline (time-series-averaged) rates of flow. These findings are corroborated by independent, optically derived velocity observations obtained from Landsat 8 imagery. Both surface and oceanic forcing mechanisms are outlined as potential controls on this seasonality. Ultimately, our findings imply that similar surface and/or ocean forcing mechanisms may be driving seasonal accelerations at the grounding lines of other ... Text Antarc* Antarctic Antarctic Peninsula Antarctica George VI Ice Shelf Greenland Ice Sheet Ice Shelf Copernicus Publications: E-Journals Antarctic Antarctic Peninsula Austral George VI Ice Shelf ENVELOPE(-67.840,-67.840,-71.692,-71.692) Greenland The Antarctic The Cryosphere 16 10 3907 3932 |
institution |
Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Recent satellite-remote sensing studies have documented the multi-decadal acceleration of the Antarctic Ice Sheet in response to rapid rates of ice-sheet retreat and thinning. Unlike the Greenland Ice Sheet, where historical, high-temporal-resolution satellite and in situ observations have revealed distinct changes in land-ice flow within intra-annual timescales, observations of similar seasonal signals are limited in Antarctica. Here, we use high-spatial- and high-temporal-resolution Copernicus Sentinel-1A/B synthetic aperture radar observations acquired between 2014 and 2020 to provide the first evidence for seasonal flow variability of the land ice feeding George VI Ice Shelf (GVIIS), Antarctic Peninsula. Our observations reveal a distinct austral summertime (December–February) speed-up of <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1" display="inline" overflow="scroll" dspmath="mathml"><mrow><mo>∼</mo><mn mathvariant="normal">0.06</mn><mo>±</mo><mn mathvariant="normal">0.005</mn></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="72pt" height="10pt" class="svg-formula" dspmath="mathimg" md5hash="91ac3833b97d79542ad5ebe2ab6d2d24"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tc-16-3907-2022-ie00001.svg" width="72pt" height="10pt" src="tc-16-3907-2022-ie00001.png"/></svg:svg> m d −1 ( ∼ 22±1.8 m yr −1 ) at, and immediately inland of, the grounding line of the glaciers nourishing the ice shelf, which constitutes a mean acceleration of ∼15 % relative to baseline (time-series-averaged) rates of flow. These findings are corroborated by independent, optically derived velocity observations obtained from Landsat 8 imagery. Both surface and oceanic forcing mechanisms are outlined as potential controls on this seasonality. Ultimately, our findings imply that similar surface and/or ocean forcing mechanisms may be driving seasonal accelerations at the grounding lines of other ... |
format |
Text |
author |
Boxall, Karla Christie, Frazer D. W. Willis, Ian C. Wuite, Jan Nagler, Thomas |
spellingShingle |
Boxall, Karla Christie, Frazer D. W. Willis, Ian C. Wuite, Jan Nagler, Thomas Seasonal land-ice-flow variability in the Antarctic Peninsula |
author_facet |
Boxall, Karla Christie, Frazer D. W. Willis, Ian C. Wuite, Jan Nagler, Thomas |
author_sort |
Boxall, Karla |
title |
Seasonal land-ice-flow variability in the Antarctic Peninsula |
title_short |
Seasonal land-ice-flow variability in the Antarctic Peninsula |
title_full |
Seasonal land-ice-flow variability in the Antarctic Peninsula |
title_fullStr |
Seasonal land-ice-flow variability in the Antarctic Peninsula |
title_full_unstemmed |
Seasonal land-ice-flow variability in the Antarctic Peninsula |
title_sort |
seasonal land-ice-flow variability in the antarctic peninsula |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-3907-2022 https://tc.copernicus.org/articles/16/3907/2022/ |
long_lat |
ENVELOPE(-67.840,-67.840,-71.692,-71.692) |
geographic |
Antarctic Antarctic Peninsula Austral George VI Ice Shelf Greenland The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Austral George VI Ice Shelf Greenland The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica George VI Ice Shelf Greenland Ice Sheet Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica George VI Ice Shelf Greenland Ice Sheet Ice Shelf |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-16-3907-2022 https://tc.copernicus.org/articles/16/3907/2022/ |
op_doi |
https://doi.org/10.5194/tc-16-3907-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
10 |
container_start_page |
3907 |
op_container_end_page |
3932 |
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1766109595201175552 |