Contrasting responses of land-terminating glaciers to recent climate variations in King George Island, Antarctica
Abstract In this study, we aim to analyse the glacier dynamics of land-terminating glaciers in King George Island (Antarctica) between 1956 and 2018. Glacial fluctuations are estimated using space-borne remote sensing data (SPOT, Landsat, PlanetScope, Sentinel-1, Sentinel-2, WorldView-2 and TanDEM-X...
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Online Access: | http://dx.doi.org/10.1017/s0954102020000279 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102020000279 |
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crcambridgeupr:10.1017/s0954102020000279 2024-09-09T19:06:22+00:00 Contrasting responses of land-terminating glaciers to recent climate variations in King George Island, Antarctica Rosa, Kátia Kellem da Perondi, Cleiva Veettil, Bijeesh Kozhikkodan Auger, Jeffrey D. Simões, Jefferson Cardia 2020 http://dx.doi.org/10.1017/s0954102020000279 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102020000279 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 32, issue 5, page 398-407 ISSN 0954-1020 1365-2079 journal-article 2020 crcambridgeupr https://doi.org/10.1017/s0954102020000279 2024-08-07T04:04:33Z Abstract In this study, we aim to analyse the glacier dynamics of land-terminating glaciers in King George Island (Antarctica) between 1956 and 2018. Glacial fluctuations are estimated using space-borne remote sensing data (SPOT, Landsat, PlanetScope, Sentinel-1, Sentinel-2, WorldView-2 and TanDEM-X). The eastern sector of Warszawa Icefield witnessed continuous glacier retreat during 1979–2018 (surface loss of 30%). The decreases in the ice-covered areas of the Tower, Windy, Ecology, Baranowski and Sphinx glaciers were 70%, 31%, 25%, 25% and 21%, respectively, with their accumulation area ratios (AARs) exhibiting negative mass balances. The winter air temperature was cooler during the 1970s with warming trends in the 1980s and early 2000s followed by a cooling trend until the present day. However, the annual time series has shown high interannual variability in air temperature during these periods. We show that the AAR, dimensions, length, frontal elevation, maximum elevation, slope and changes in the terminus position influence the glacier response to climate change at various timescales. Furthermore, three geomorphic activity intensity zones and a complete paraglacial sequence are identified while contrasting the proglacial systems. Overall, subglacial deposits predominate and indicate that meltwater flows on the bed, producing wet-based thermal regimes. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica King George Island ice covered areas Cambridge University Press King George Island Sphinx ENVELOPE(31.250,31.250,-72.350,-72.350) Warszawa Icefield ENVELOPE(-58.558,-58.558,-62.203,-62.203) Antarctic Science 32 5 398 407 |
institution |
Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract In this study, we aim to analyse the glacier dynamics of land-terminating glaciers in King George Island (Antarctica) between 1956 and 2018. Glacial fluctuations are estimated using space-borne remote sensing data (SPOT, Landsat, PlanetScope, Sentinel-1, Sentinel-2, WorldView-2 and TanDEM-X). The eastern sector of Warszawa Icefield witnessed continuous glacier retreat during 1979–2018 (surface loss of 30%). The decreases in the ice-covered areas of the Tower, Windy, Ecology, Baranowski and Sphinx glaciers were 70%, 31%, 25%, 25% and 21%, respectively, with their accumulation area ratios (AARs) exhibiting negative mass balances. The winter air temperature was cooler during the 1970s with warming trends in the 1980s and early 2000s followed by a cooling trend until the present day. However, the annual time series has shown high interannual variability in air temperature during these periods. We show that the AAR, dimensions, length, frontal elevation, maximum elevation, slope and changes in the terminus position influence the glacier response to climate change at various timescales. Furthermore, three geomorphic activity intensity zones and a complete paraglacial sequence are identified while contrasting the proglacial systems. Overall, subglacial deposits predominate and indicate that meltwater flows on the bed, producing wet-based thermal regimes. |
format |
Article in Journal/Newspaper |
author |
Rosa, Kátia Kellem da Perondi, Cleiva Veettil, Bijeesh Kozhikkodan Auger, Jeffrey D. Simões, Jefferson Cardia |
spellingShingle |
Rosa, Kátia Kellem da Perondi, Cleiva Veettil, Bijeesh Kozhikkodan Auger, Jeffrey D. Simões, Jefferson Cardia Contrasting responses of land-terminating glaciers to recent climate variations in King George Island, Antarctica |
author_facet |
Rosa, Kátia Kellem da Perondi, Cleiva Veettil, Bijeesh Kozhikkodan Auger, Jeffrey D. Simões, Jefferson Cardia |
author_sort |
Rosa, Kátia Kellem da |
title |
Contrasting responses of land-terminating glaciers to recent climate variations in King George Island, Antarctica |
title_short |
Contrasting responses of land-terminating glaciers to recent climate variations in King George Island, Antarctica |
title_full |
Contrasting responses of land-terminating glaciers to recent climate variations in King George Island, Antarctica |
title_fullStr |
Contrasting responses of land-terminating glaciers to recent climate variations in King George Island, Antarctica |
title_full_unstemmed |
Contrasting responses of land-terminating glaciers to recent climate variations in King George Island, Antarctica |
title_sort |
contrasting responses of land-terminating glaciers to recent climate variations in king george island, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
2020 |
url |
http://dx.doi.org/10.1017/s0954102020000279 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102020000279 |
long_lat |
ENVELOPE(31.250,31.250,-72.350,-72.350) ENVELOPE(-58.558,-58.558,-62.203,-62.203) |
geographic |
King George Island Sphinx Warszawa Icefield |
geographic_facet |
King George Island Sphinx Warszawa Icefield |
genre |
Antarc* Antarctic Science Antarctica King George Island ice covered areas |
genre_facet |
Antarc* Antarctic Science Antarctica King George Island ice covered areas |
op_source |
Antarctic Science volume 32, issue 5, page 398-407 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102020000279 |
container_title |
Antarctic Science |
container_volume |
32 |
container_issue |
5 |
container_start_page |
398 |
op_container_end_page |
407 |
_version_ |
1809820406226354176 |