Mapping Basal Melt Under the Shackleton Ice Shelf, East Antarctica, From CryoSat-2 Radar Altimetry
Ice shelvesbuttress the fast-flowing glaciers draining ice sheets, so changes in the ice shelves may alter the buttressing effect and the discharge of grounded ice, therefore influencing sea level. Basal melting of the ice shelves would reduce their ability to restrain the discharge of grounded ice...
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ftdoajarticles:oai:doaj.org/article:9052912fd17c45fcad3692ba19ba34d9 2023-05-15T13:37:15+02:00 Mapping Basal Melt Under the Shackleton Ice Shelf, East Antarctica, From CryoSat-2 Radar Altimetry Qi Liang Chunxia Zhou Lei Zheng 2021-01-01T00:00:00Z https://doi.org/10.1109/JSTARS.2021.3077359 https://doaj.org/article/9052912fd17c45fcad3692ba19ba34d9 EN eng IEEE https://ieeexplore.ieee.org/document/9423551/ https://doaj.org/toc/2151-1535 2151-1535 doi:10.1109/JSTARS.2021.3077359 https://doaj.org/article/9052912fd17c45fcad3692ba19ba34d9 IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 14, Pp 5091-5099 (2021) Altimetry basal melt rate CryoSat-2 ice shelf Lagrangian framework Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 article 2021 ftdoajarticles https://doi.org/10.1109/JSTARS.2021.3077359 2022-12-31T06:21:43Z Ice shelvesbuttress the fast-flowing glaciers draining ice sheets, so changes in the ice shelves may alter the buttressing effect and the discharge of grounded ice, therefore influencing sea level. Basal melting of the ice shelves would reduce their ability to restrain the discharge of grounded ice into the ocean. However, estimating the basal melt rate is challenging due to the large uncertainty in the calculation. In this study, we use a Lagrangian framework to improve the basal melt rate derivation and apply the method to the Shackleton ice shelf as a case study. We use the CryoSat-2 data to characterize the spatial distribution patterns of ice shelf surface elevation changes between 2010 and 2018. Combining these results with the ice surface velocity and output from the regional climate model, we obtain a map of the basal melt rate and calculate the total and average basal mass balance. The total basal meltwater production for the Shackleton ice shelf is 54.6 ± 7.2 Gt/yr. The highest melt rates, which exceed 50 m/yr, are found close to the grounding line and the main trunk of Denman glacier. Based on the analysis, we show that the Lagrangian method can provide more spatially coherent patterns of ice shelf surface elevation changes and reduce the uncertainty in basal melt rate calculation. Article in Journal/Newspaper Antarc* Antarctica Denman Glacier East Antarctica Ice Shelf Ice Shelves Shackleton Ice Shelf Directory of Open Access Journals: DOAJ Articles East Antarctica Shackleton Shackleton Ice Shelf ENVELOPE(100.504,100.504,-65.996,-65.996) Denman Glacier ENVELOPE(99.417,99.417,-66.750,-66.750) IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 14 5091 5099 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Altimetry basal melt rate CryoSat-2 ice shelf Lagrangian framework Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Altimetry basal melt rate CryoSat-2 ice shelf Lagrangian framework Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 Qi Liang Chunxia Zhou Lei Zheng Mapping Basal Melt Under the Shackleton Ice Shelf, East Antarctica, From CryoSat-2 Radar Altimetry |
topic_facet |
Altimetry basal melt rate CryoSat-2 ice shelf Lagrangian framework Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 |
description |
Ice shelvesbuttress the fast-flowing glaciers draining ice sheets, so changes in the ice shelves may alter the buttressing effect and the discharge of grounded ice, therefore influencing sea level. Basal melting of the ice shelves would reduce their ability to restrain the discharge of grounded ice into the ocean. However, estimating the basal melt rate is challenging due to the large uncertainty in the calculation. In this study, we use a Lagrangian framework to improve the basal melt rate derivation and apply the method to the Shackleton ice shelf as a case study. We use the CryoSat-2 data to characterize the spatial distribution patterns of ice shelf surface elevation changes between 2010 and 2018. Combining these results with the ice surface velocity and output from the regional climate model, we obtain a map of the basal melt rate and calculate the total and average basal mass balance. The total basal meltwater production for the Shackleton ice shelf is 54.6 ± 7.2 Gt/yr. The highest melt rates, which exceed 50 m/yr, are found close to the grounding line and the main trunk of Denman glacier. Based on the analysis, we show that the Lagrangian method can provide more spatially coherent patterns of ice shelf surface elevation changes and reduce the uncertainty in basal melt rate calculation. |
format |
Article in Journal/Newspaper |
author |
Qi Liang Chunxia Zhou Lei Zheng |
author_facet |
Qi Liang Chunxia Zhou Lei Zheng |
author_sort |
Qi Liang |
title |
Mapping Basal Melt Under the Shackleton Ice Shelf, East Antarctica, From CryoSat-2 Radar Altimetry |
title_short |
Mapping Basal Melt Under the Shackleton Ice Shelf, East Antarctica, From CryoSat-2 Radar Altimetry |
title_full |
Mapping Basal Melt Under the Shackleton Ice Shelf, East Antarctica, From CryoSat-2 Radar Altimetry |
title_fullStr |
Mapping Basal Melt Under the Shackleton Ice Shelf, East Antarctica, From CryoSat-2 Radar Altimetry |
title_full_unstemmed |
Mapping Basal Melt Under the Shackleton Ice Shelf, East Antarctica, From CryoSat-2 Radar Altimetry |
title_sort |
mapping basal melt under the shackleton ice shelf, east antarctica, from cryosat-2 radar altimetry |
publisher |
IEEE |
publishDate |
2021 |
url |
https://doi.org/10.1109/JSTARS.2021.3077359 https://doaj.org/article/9052912fd17c45fcad3692ba19ba34d9 |
long_lat |
ENVELOPE(100.504,100.504,-65.996,-65.996) ENVELOPE(99.417,99.417,-66.750,-66.750) |
geographic |
East Antarctica Shackleton Shackleton Ice Shelf Denman Glacier |
geographic_facet |
East Antarctica Shackleton Shackleton Ice Shelf Denman Glacier |
genre |
Antarc* Antarctica Denman Glacier East Antarctica Ice Shelf Ice Shelves Shackleton Ice Shelf |
genre_facet |
Antarc* Antarctica Denman Glacier East Antarctica Ice Shelf Ice Shelves Shackleton Ice Shelf |
op_source |
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 14, Pp 5091-5099 (2021) |
op_relation |
https://ieeexplore.ieee.org/document/9423551/ https://doaj.org/toc/2151-1535 2151-1535 doi:10.1109/JSTARS.2021.3077359 https://doaj.org/article/9052912fd17c45fcad3692ba19ba34d9 |
op_doi |
https://doi.org/10.1109/JSTARS.2021.3077359 |
container_title |
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
container_volume |
14 |
container_start_page |
5091 |
op_container_end_page |
5099 |
_version_ |
1766089762813247488 |