Thirteen years of subglacial lake activity in Antarctica from multi-mission satellite altimetry
ABSTRACT The ability to detect the surface expression of moving water beneath the Antarctic ice sheet by satellite has revealed a dynamic basal environment, with implications for regional ice dynamics, grounding-line stability, and fluxes of freshwater and nutrients to the Southern Ocean. Knowledge...
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Online Access: | http://dx.doi.org/10.1017/aog.2017.36 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305517000362 |
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crcambridgeupr:10.1017/aog.2017.36 2024-06-23T07:45:36+00:00 Thirteen years of subglacial lake activity in Antarctica from multi-mission satellite altimetry Siegfried, Matthew R. Fricker, Helen A. 2018 http://dx.doi.org/10.1017/aog.2017.36 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305517000362 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Annals of Glaciology volume 59, issue 76pt1, page 42-55 ISSN 0260-3055 1727-5644 journal-article 2018 crcambridgeupr https://doi.org/10.1017/aog.2017.36 2024-06-05T04:03:08Z ABSTRACT The ability to detect the surface expression of moving water beneath the Antarctic ice sheet by satellite has revealed a dynamic basal environment, with implications for regional ice dynamics, grounding-line stability, and fluxes of freshwater and nutrients to the Southern Ocean. Knowledge of subglacial activity on timescales important for near-term prediction of ice-sheet fluctuations (decadal to century) is limited by the short observational record of NASA's Ice, Cloud, and land Elevation Satellite (ICESat) laser altimetry mission used to generate the last continent-wide survey (2003–08). Here, we use synthetic aperture radar-interferometric-mode data from ESA's CryoSat-2 radar altimetry mission (2010–present), which samples 45 of the ICESat-derived subglacial lakes, to extend their time series to the end of 2016. The extended time series show that there have been surface-height changes at 20 of the 45 lakes since 2008, indicating that some of these features are persistent and potentially cyclic, while other features show negligible changes, suggesting these may be transient or nonhydrological features. Continued monitoring of active lakes for both height and velocity changes, as well as developing methods for identifying additional lakes, is critical to quantifying the full distribution of active subglacial lakes in Antarctica. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Antarctica Ice Sheet Southern Ocean Cambridge University Press Antarctic Southern Ocean The Antarctic Annals of Glaciology 59 76pt1 42 55 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
ABSTRACT The ability to detect the surface expression of moving water beneath the Antarctic ice sheet by satellite has revealed a dynamic basal environment, with implications for regional ice dynamics, grounding-line stability, and fluxes of freshwater and nutrients to the Southern Ocean. Knowledge of subglacial activity on timescales important for near-term prediction of ice-sheet fluctuations (decadal to century) is limited by the short observational record of NASA's Ice, Cloud, and land Elevation Satellite (ICESat) laser altimetry mission used to generate the last continent-wide survey (2003–08). Here, we use synthetic aperture radar-interferometric-mode data from ESA's CryoSat-2 radar altimetry mission (2010–present), which samples 45 of the ICESat-derived subglacial lakes, to extend their time series to the end of 2016. The extended time series show that there have been surface-height changes at 20 of the 45 lakes since 2008, indicating that some of these features are persistent and potentially cyclic, while other features show negligible changes, suggesting these may be transient or nonhydrological features. Continued monitoring of active lakes for both height and velocity changes, as well as developing methods for identifying additional lakes, is critical to quantifying the full distribution of active subglacial lakes in Antarctica. |
format |
Article in Journal/Newspaper |
author |
Siegfried, Matthew R. Fricker, Helen A. |
spellingShingle |
Siegfried, Matthew R. Fricker, Helen A. Thirteen years of subglacial lake activity in Antarctica from multi-mission satellite altimetry |
author_facet |
Siegfried, Matthew R. Fricker, Helen A. |
author_sort |
Siegfried, Matthew R. |
title |
Thirteen years of subglacial lake activity in Antarctica from multi-mission satellite altimetry |
title_short |
Thirteen years of subglacial lake activity in Antarctica from multi-mission satellite altimetry |
title_full |
Thirteen years of subglacial lake activity in Antarctica from multi-mission satellite altimetry |
title_fullStr |
Thirteen years of subglacial lake activity in Antarctica from multi-mission satellite altimetry |
title_full_unstemmed |
Thirteen years of subglacial lake activity in Antarctica from multi-mission satellite altimetry |
title_sort |
thirteen years of subglacial lake activity in antarctica from multi-mission satellite altimetry |
publisher |
Cambridge University Press (CUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1017/aog.2017.36 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305517000362 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Annals of Glaciology Antarc* Antarctic Antarctica Ice Sheet Southern Ocean |
genre_facet |
Annals of Glaciology Antarc* Antarctic Antarctica Ice Sheet Southern Ocean |
op_source |
Annals of Glaciology volume 59, issue 76pt1, page 42-55 ISSN 0260-3055 1727-5644 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/aog.2017.36 |
container_title |
Annals of Glaciology |
container_volume |
59 |
container_issue |
76pt1 |
container_start_page |
42 |
op_container_end_page |
55 |
_version_ |
1802641419140071424 |