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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2022
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Online Access: | https://doi.org/10.5194/tc-16-3907-2022 https://doaj.org/article/4b8b7f20ea3045119ca7dcb4dd62139e |
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ftdoajarticles:oai:doaj.org/article:4b8b7f20ea3045119ca7dcb4dd62139e 2023-05-15T13:53:13+02:00 Seasonal land-ice-flow variability in the Antarctic Peninsula K. Boxall F. D. W. Christie I. C. Willis J. Wuite T. Nagler 2022-10-01T00:00:00Z https://doi.org/10.5194/tc-16-3907-2022 https://doaj.org/article/4b8b7f20ea3045119ca7dcb4dd62139e EN eng Copernicus Publications https://tc.copernicus.org/articles/16/3907/2022/tc-16-3907-2022.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-16-3907-2022 1994-0416 1994-0424 https://doaj.org/article/4b8b7f20ea3045119ca7dcb4dd62139e The Cryosphere, Vol 16, Pp 3907-3932 (2022) Environmental sciences GE1-350 Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.5194/tc-16-3907-2022 2022-12-30T23:15:38Z 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 ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica George VI Ice Shelf Greenland Ice Sheet Ice Shelf The Cryosphere Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Antarctic Peninsula Austral Greenland George VI Ice Shelf ENVELOPE(-67.840,-67.840,-71.692,-71.692) The Cryosphere 16 10 3907 3932 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 K. Boxall F. D. W. Christie I. C. Willis J. Wuite T. Nagler Seasonal land-ice-flow variability in the Antarctic Peninsula |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
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 |
Article in Journal/Newspaper |
author |
K. Boxall F. D. W. Christie I. C. Willis J. Wuite T. Nagler |
author_facet |
K. Boxall F. D. W. Christie I. C. Willis J. Wuite T. Nagler |
author_sort |
K. Boxall |
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 |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-3907-2022 https://doaj.org/article/4b8b7f20ea3045119ca7dcb4dd62139e |
long_lat |
ENVELOPE(-67.840,-67.840,-71.692,-71.692) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Austral Greenland George VI Ice Shelf |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Austral Greenland George VI Ice Shelf |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica George VI Ice Shelf Greenland Ice Sheet Ice Shelf The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica George VI Ice Shelf Greenland Ice Sheet Ice Shelf The Cryosphere |
op_source |
The Cryosphere, Vol 16, Pp 3907-3932 (2022) |
op_relation |
https://tc.copernicus.org/articles/16/3907/2022/tc-16-3907-2022.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-16-3907-2022 1994-0416 1994-0424 https://doaj.org/article/4b8b7f20ea3045119ca7dcb4dd62139e |
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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1766258189547864064 |