Spatiotemporal change analysis for snowmelt over the Antarctic ice shelves using scatterometers
Using Scatterometer-based backscatter data, the spatial and temporal melt dynamics of Antarctic ice shelves were tracked from 2000 to 2018. We constructed melt onset and duration maps for the whole Antarctic ice shelves using a pixel-based, adaptive threshold approach based on backscatter during the...
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Online Access: | http://dx.doi.org/10.3389/frsen.2022.953733 https://www.frontiersin.org/articles/10.3389/frsen.2022.953733/full |
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crfrontiers:10.3389/frsen.2022.953733 2024-02-11T09:55:12+01:00 Spatiotemporal change analysis for snowmelt over the Antarctic ice shelves using scatterometers Luis, Alvarinho J. Alam, Mahfooz Jawak, Shridhar D. 2022 http://dx.doi.org/10.3389/frsen.2022.953733 https://www.frontiersin.org/articles/10.3389/frsen.2022.953733/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Remote Sensing volume 3 ISSN 2673-6187 journal-article 2022 crfrontiers https://doi.org/10.3389/frsen.2022.953733 2024-01-26T09:56:10Z Using Scatterometer-based backscatter data, the spatial and temporal melt dynamics of Antarctic ice shelves were tracked from 2000 to 2018. We constructed melt onset and duration maps for the whole Antarctic ice shelves using a pixel-based, adaptive threshold approach based on backscatter during the transition period between winter and summer. We explore the climatic influences on the spatial extent and timing of snowmelt using meteorological data from automatic weather stations and investigate the climatic controls on the spatial extent and timing of snowmelt. Melt extent usually starts in the latter week of November, peaks in the end of December/January, and vanishes in the first/second week of February on most ice shelves. On the Antarctic Peninsula (AP), the average melt was 70 days, with the melt onset on 20 November for almost 50% of the region. In comparison to the AP, the Eastern Antarctic experienced less melt, with melt lasting 40–50 days. For the Larsen-C, Shackleton, Amery, and Fimbul ice shelf, there was a substantial link between melt area and air temperature. A significant correlation is found between increased temperature advection and high melt area for the Amery, Shackleton, and Larsen-C ice shelves. The time series of total melt area showed a decreasing trend of −196 km 2 /yr which was statistical significant at 97% interval. The teleconnections discovered between melt area and the combined anomalies of Southern Annular Mode and Southern Oscillation Index point to the high southern latitudes being coupled to the global climate system. The most persistent and intensive melt occurred on the AP, West Ice Shelf, Shackleton Ice Shelf, and Amery Ice Shelf, which should be actively monitored for future stability. Article in Journal/Newspaper Amery Ice Shelf Antarc* Antarctic Antarctic Peninsula Fimbul Ice Shelf Ice Shelf Ice Shelves Shackleton Ice Shelf West Ice Shelf Frontiers (Publisher) Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Antarctic Antarctic Peninsula Fimbul Ice Shelf ENVELOPE(-0.500,-0.500,-70.750,-70.750) Index Point ENVELOPE(167.917,167.917,-73.350,-73.350) Shackleton Shackleton Ice Shelf ENVELOPE(100.504,100.504,-65.996,-65.996) The Antarctic West Ice Shelf ENVELOPE(85.000,85.000,-67.000,-67.000) Frontiers in Remote Sensing 3 |
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Frontiers (Publisher) |
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description |
Using Scatterometer-based backscatter data, the spatial and temporal melt dynamics of Antarctic ice shelves were tracked from 2000 to 2018. We constructed melt onset and duration maps for the whole Antarctic ice shelves using a pixel-based, adaptive threshold approach based on backscatter during the transition period between winter and summer. We explore the climatic influences on the spatial extent and timing of snowmelt using meteorological data from automatic weather stations and investigate the climatic controls on the spatial extent and timing of snowmelt. Melt extent usually starts in the latter week of November, peaks in the end of December/January, and vanishes in the first/second week of February on most ice shelves. On the Antarctic Peninsula (AP), the average melt was 70 days, with the melt onset on 20 November for almost 50% of the region. In comparison to the AP, the Eastern Antarctic experienced less melt, with melt lasting 40–50 days. For the Larsen-C, Shackleton, Amery, and Fimbul ice shelf, there was a substantial link between melt area and air temperature. A significant correlation is found between increased temperature advection and high melt area for the Amery, Shackleton, and Larsen-C ice shelves. The time series of total melt area showed a decreasing trend of −196 km 2 /yr which was statistical significant at 97% interval. The teleconnections discovered between melt area and the combined anomalies of Southern Annular Mode and Southern Oscillation Index point to the high southern latitudes being coupled to the global climate system. The most persistent and intensive melt occurred on the AP, West Ice Shelf, Shackleton Ice Shelf, and Amery Ice Shelf, which should be actively monitored for future stability. |
format |
Article in Journal/Newspaper |
author |
Luis, Alvarinho J. Alam, Mahfooz Jawak, Shridhar D. |
spellingShingle |
Luis, Alvarinho J. Alam, Mahfooz Jawak, Shridhar D. Spatiotemporal change analysis for snowmelt over the Antarctic ice shelves using scatterometers |
author_facet |
Luis, Alvarinho J. Alam, Mahfooz Jawak, Shridhar D. |
author_sort |
Luis, Alvarinho J. |
title |
Spatiotemporal change analysis for snowmelt over the Antarctic ice shelves using scatterometers |
title_short |
Spatiotemporal change analysis for snowmelt over the Antarctic ice shelves using scatterometers |
title_full |
Spatiotemporal change analysis for snowmelt over the Antarctic ice shelves using scatterometers |
title_fullStr |
Spatiotemporal change analysis for snowmelt over the Antarctic ice shelves using scatterometers |
title_full_unstemmed |
Spatiotemporal change analysis for snowmelt over the Antarctic ice shelves using scatterometers |
title_sort |
spatiotemporal change analysis for snowmelt over the antarctic ice shelves using scatterometers |
publisher |
Frontiers Media SA |
publishDate |
2022 |
url |
http://dx.doi.org/10.3389/frsen.2022.953733 https://www.frontiersin.org/articles/10.3389/frsen.2022.953733/full |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) ENVELOPE(-0.500,-0.500,-70.750,-70.750) ENVELOPE(167.917,167.917,-73.350,-73.350) ENVELOPE(100.504,100.504,-65.996,-65.996) ENVELOPE(85.000,85.000,-67.000,-67.000) |
geographic |
Amery Amery Ice Shelf Antarctic Antarctic Peninsula Fimbul Ice Shelf Index Point Shackleton Shackleton Ice Shelf The Antarctic West Ice Shelf |
geographic_facet |
Amery Amery Ice Shelf Antarctic Antarctic Peninsula Fimbul Ice Shelf Index Point Shackleton Shackleton Ice Shelf The Antarctic West Ice Shelf |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctic Peninsula Fimbul Ice Shelf Ice Shelf Ice Shelves Shackleton Ice Shelf West Ice Shelf |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctic Peninsula Fimbul Ice Shelf Ice Shelf Ice Shelves Shackleton Ice Shelf West Ice Shelf |
op_source |
Frontiers in Remote Sensing volume 3 ISSN 2673-6187 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/frsen.2022.953733 |
container_title |
Frontiers in Remote Sensing |
container_volume |
3 |
_version_ |
1790594389403238400 |