Surface melt on the Shackleton Ice Shelf, East Antarctica (2003–2021)
International audience Abstract. Melt on the surface of Antarctic ice shelves can potentially lead to their disintegration, accelerating the flow of grounded ice to the ocean and raising global sea levels. However, the current understanding of the processes driving surface melt is incomplete, increa...
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Online Access: | https://hal.science/hal-04389362 https://hal.science/hal-04389362/document https://hal.science/hal-04389362/file/saunderson_melt_tc_2022.pdf https://doi.org/10.5194/tc-16-4553-2022 |
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ftutoulouse3hal:oai:HAL:hal-04389362v1 2024-05-12T07:54:58+00:00 Surface melt on the Shackleton Ice Shelf, East Antarctica (2003–2021) Saunderson, Dominic Mackintosh, Andrew Mccormack, Felicity Jones, Richard Selwyn Picard, Ghislain University of Kent Canterbury Université Grenoble Alpes (UGA) Université Joseph Fourier - Grenoble 1 (UJF) University of Sheffield Sheffield Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT) 2022-10-27 https://hal.science/hal-04389362 https://hal.science/hal-04389362/document https://hal.science/hal-04389362/file/saunderson_melt_tc_2022.pdf https://doi.org/10.5194/tc-16-4553-2022 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-16-4553-2022 hal-04389362 https://hal.science/hal-04389362 https://hal.science/hal-04389362/document https://hal.science/hal-04389362/file/saunderson_melt_tc_2022.pdf doi:10.5194/tc-16-4553-2022 info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-04389362 The Cryosphere, 2022, 16 (10), pp.4553-4569. ⟨10.5194/tc-16-4553-2022⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2022 ftutoulouse3hal https://doi.org/10.5194/tc-16-4553-2022 2024-04-18T00:38:25Z International audience Abstract. Melt on the surface of Antarctic ice shelves can potentially lead to their disintegration, accelerating the flow of grounded ice to the ocean and raising global sea levels. However, the current understanding of the processes driving surface melt is incomplete, increasing uncertainty in predictions of ice shelf stability and thus of Antarctica's contribution to sea-level rise. Previous studies of surface melt in Antarctica have usually focused on either a process-level understanding of melt through energy-balance investigations or used metrics such as the annual number of melt days to quantify spatiotemporal variability in satellite observations of surface melt. Here, we help bridge the gap between work at these two scales. Using daily passive microwave observations from the AMSR-E and AMSR-2 sensors and the machine learning approach of a self-organising map, we identify nine representative spatial distributions (“patterns”) of surface melt on the Shackleton Ice Shelf in East Antarctica from 2002/03–2020/21. Combined with output from the RACMO2.3p3 regional climate model and surface topography from the REMA digital elevation model, our results point to a significant role for surface air temperatures in controlling the interannual variability in summer melt and also reveal the influence of localised controls on melt. In particular, prolonged melt along the grounding line shows the importance of katabatic winds and surface albedo. Our approach highlights the necessity of understanding both local and large-scale controls on surface melt and demonstrates that self-organising maps can be used to investigate the variability in surface melt on Antarctic ice shelves. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves Shackleton Ice Shelf The Cryosphere Université Toulouse III - Paul Sabatier: HAL-UPS Antarctic East Antarctica Shackleton Shackleton Ice Shelf ENVELOPE(100.504,100.504,-65.996,-65.996) The Cryosphere 16 10 4553 4569 |
institution |
Open Polar |
collection |
Université Toulouse III - Paul Sabatier: HAL-UPS |
op_collection_id |
ftutoulouse3hal |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Saunderson, Dominic Mackintosh, Andrew Mccormack, Felicity Jones, Richard Selwyn Picard, Ghislain Surface melt on the Shackleton Ice Shelf, East Antarctica (2003–2021) |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Abstract. Melt on the surface of Antarctic ice shelves can potentially lead to their disintegration, accelerating the flow of grounded ice to the ocean and raising global sea levels. However, the current understanding of the processes driving surface melt is incomplete, increasing uncertainty in predictions of ice shelf stability and thus of Antarctica's contribution to sea-level rise. Previous studies of surface melt in Antarctica have usually focused on either a process-level understanding of melt through energy-balance investigations or used metrics such as the annual number of melt days to quantify spatiotemporal variability in satellite observations of surface melt. Here, we help bridge the gap between work at these two scales. Using daily passive microwave observations from the AMSR-E and AMSR-2 sensors and the machine learning approach of a self-organising map, we identify nine representative spatial distributions (“patterns”) of surface melt on the Shackleton Ice Shelf in East Antarctica from 2002/03–2020/21. Combined with output from the RACMO2.3p3 regional climate model and surface topography from the REMA digital elevation model, our results point to a significant role for surface air temperatures in controlling the interannual variability in summer melt and also reveal the influence of localised controls on melt. In particular, prolonged melt along the grounding line shows the importance of katabatic winds and surface albedo. Our approach highlights the necessity of understanding both local and large-scale controls on surface melt and demonstrates that self-organising maps can be used to investigate the variability in surface melt on Antarctic ice shelves. |
author2 |
University of Kent Canterbury Université Grenoble Alpes (UGA) Université Joseph Fourier - Grenoble 1 (UJF) University of Sheffield Sheffield Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT) |
format |
Article in Journal/Newspaper |
author |
Saunderson, Dominic Mackintosh, Andrew Mccormack, Felicity Jones, Richard Selwyn Picard, Ghislain |
author_facet |
Saunderson, Dominic Mackintosh, Andrew Mccormack, Felicity Jones, Richard Selwyn Picard, Ghislain |
author_sort |
Saunderson, Dominic |
title |
Surface melt on the Shackleton Ice Shelf, East Antarctica (2003–2021) |
title_short |
Surface melt on the Shackleton Ice Shelf, East Antarctica (2003–2021) |
title_full |
Surface melt on the Shackleton Ice Shelf, East Antarctica (2003–2021) |
title_fullStr |
Surface melt on the Shackleton Ice Shelf, East Antarctica (2003–2021) |
title_full_unstemmed |
Surface melt on the Shackleton Ice Shelf, East Antarctica (2003–2021) |
title_sort |
surface melt on the shackleton ice shelf, east antarctica (2003–2021) |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-04389362 https://hal.science/hal-04389362/document https://hal.science/hal-04389362/file/saunderson_melt_tc_2022.pdf https://doi.org/10.5194/tc-16-4553-2022 |
long_lat |
ENVELOPE(100.504,100.504,-65.996,-65.996) |
geographic |
Antarctic East Antarctica Shackleton Shackleton Ice Shelf |
geographic_facet |
Antarctic East Antarctica Shackleton Shackleton Ice Shelf |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves Shackleton Ice Shelf The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves Shackleton Ice Shelf The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-04389362 The Cryosphere, 2022, 16 (10), pp.4553-4569. ⟨10.5194/tc-16-4553-2022⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-16-4553-2022 hal-04389362 https://hal.science/hal-04389362 https://hal.science/hal-04389362/document https://hal.science/hal-04389362/file/saunderson_melt_tc_2022.pdf doi:10.5194/tc-16-4553-2022 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-16-4553-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
10 |
container_start_page |
4553 |
op_container_end_page |
4569 |
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1798854039510712320 |