Wintertime polynya structure and variability from thermal remote sensing and seal-borne observations at Pine Island Glacier, West Antarctica
Antarctica’s ice shelves play a critical role in modulating ice loss to the ocean by buttressing grounded ice upstream. With the potential to impact ice-shelf stability, persistent polynyas (open-water areas surrounded by sea ice, persisting for multipleyears at the same location) at the edge of man...
Published in: | IEEE Transactions on Geoscience and Remote Sensing |
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Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2023
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/wintertime-polynya-structure-and-variability-from-thermal-remote-sensing-and-sealborne-observations-at-pine-island-glacier-west-antarctica(16372782-3535-4dbe-9cab-49b836cb63f4).html https://doi.org/10.1109/TGRS.2023.3271453 https://research-repository.st-andrews.ac.uk/bitstream/10023/27482/1/Savidge_2023_Wintertime_polynya_structure_IEEETGRS_CCBY.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/16372782-3535-4dbe-9cab-49b836cb63f4 2024-06-23T07:47:34+00:00 Wintertime polynya structure and variability from thermal remote sensing and seal-borne observations at Pine Island Glacier, West Antarctica Savidge, Elena Snow, Tasha Siegfried, Matthew R. Zheng, Yixi Villas Bôas, Ana B. Bortolotto, Guilherme A. Boehme, Lars Alley, Karen E. 2023-05-17 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/wintertime-polynya-structure-and-variability-from-thermal-remote-sensing-and-sealborne-observations-at-pine-island-glacier-west-antarctica(16372782-3535-4dbe-9cab-49b836cb63f4).html https://doi.org/10.1109/TGRS.2023.3271453 https://research-repository.st-andrews.ac.uk/bitstream/10023/27482/1/Savidge_2023_Wintertime_polynya_structure_IEEETGRS_CCBY.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/wintertime-polynya-structure-and-variability-from-thermal-remote-sensing-and-sealborne-observations-at-pine-island-glacier-west-antarctica(16372782-3535-4dbe-9cab-49b836cb63f4).html info:eu-repo/semantics/openAccess Savidge , E , Snow , T , Siegfried , M R , Zheng , Y , Villas Bôas , A B , Bortolotto , G A , Boehme , L & Alley , K E 2023 , ' Wintertime polynya structure and variability from thermal remote sensing and seal-borne observations at Pine Island Glacier, West Antarctica ' , IEEE Transactions on Geoscience and Remote Sensing , vol. 61 , 4300813 . https://doi.org/10.1109/TGRS.2023.3271453 Polynya Oceanography Antarctica article 2023 ftunstandrewcris https://doi.org/10.1109/TGRS.2023.3271453 2024-06-13T01:22:10Z Antarctica’s ice shelves play a critical role in modulating ice loss to the ocean by buttressing grounded ice upstream. With the potential to impact ice-shelf stability, persistent polynyas (open-water areas surrounded by sea ice, persisting for multipleyears at the same location) at the edge of many ice-shelffronts, are maintained by winds and/or ocean heat, and arelocations of strong ice-ocean-atmosphere interactions. However, in situ observations of polynyas are sparse due to the logistical constraints of collecting Antarctic field measurements. Here, we used wintertime (May–August) temperature and salinity observations derived from seal-borne tags deployed in 2014, 2019, and2020, in conjunction with thermal imagery from the Moderate Resolution Imaging Spectroradiometer (MODIS) and the Landsat 8 Thermal Infrared Sensor (TIRS) to investigate the spatial, temporal, and thermal structural variability of polynyas near Pine Island Glacier (PIG). Across the three winters considered, there were 148 anomalously warm (>3σ from background) sealdives near the PIG ice front, including 24 dives that coincided with MODIS images with minimal cloud cover that also showed a warm surface temperature anomaly. These warm surface temperatures correlated with ocean temperatures down to 150 m depth or deeper, depending on the year, suggesting that MODIS derived surface thermal anomalies can be used for monitoring polynya presence and structure during polar night. The finer spatial resolution (100 m) of TIRS wintertime thermal imagery captures more detailed thermal structural variability within these polynyas, which may provide year-round insight into sub-ice-shelf processes if this dataset is collected operationally. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Pine Island Pine Island Glacier polar night Sea ice West Antarctica University of St Andrews: Research Portal Antarctic Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) West Antarctica IEEE Transactions on Geoscience and Remote Sensing 61 1 13 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Polynya Oceanography Antarctica |
spellingShingle |
Polynya Oceanography Antarctica Savidge, Elena Snow, Tasha Siegfried, Matthew R. Zheng, Yixi Villas Bôas, Ana B. Bortolotto, Guilherme A. Boehme, Lars Alley, Karen E. Wintertime polynya structure and variability from thermal remote sensing and seal-borne observations at Pine Island Glacier, West Antarctica |
topic_facet |
Polynya Oceanography Antarctica |
description |
Antarctica’s ice shelves play a critical role in modulating ice loss to the ocean by buttressing grounded ice upstream. With the potential to impact ice-shelf stability, persistent polynyas (open-water areas surrounded by sea ice, persisting for multipleyears at the same location) at the edge of many ice-shelffronts, are maintained by winds and/or ocean heat, and arelocations of strong ice-ocean-atmosphere interactions. However, in situ observations of polynyas are sparse due to the logistical constraints of collecting Antarctic field measurements. Here, we used wintertime (May–August) temperature and salinity observations derived from seal-borne tags deployed in 2014, 2019, and2020, in conjunction with thermal imagery from the Moderate Resolution Imaging Spectroradiometer (MODIS) and the Landsat 8 Thermal Infrared Sensor (TIRS) to investigate the spatial, temporal, and thermal structural variability of polynyas near Pine Island Glacier (PIG). Across the three winters considered, there were 148 anomalously warm (>3σ from background) sealdives near the PIG ice front, including 24 dives that coincided with MODIS images with minimal cloud cover that also showed a warm surface temperature anomaly. These warm surface temperatures correlated with ocean temperatures down to 150 m depth or deeper, depending on the year, suggesting that MODIS derived surface thermal anomalies can be used for monitoring polynya presence and structure during polar night. The finer spatial resolution (100 m) of TIRS wintertime thermal imagery captures more detailed thermal structural variability within these polynyas, which may provide year-round insight into sub-ice-shelf processes if this dataset is collected operationally. |
format |
Article in Journal/Newspaper |
author |
Savidge, Elena Snow, Tasha Siegfried, Matthew R. Zheng, Yixi Villas Bôas, Ana B. Bortolotto, Guilherme A. Boehme, Lars Alley, Karen E. |
author_facet |
Savidge, Elena Snow, Tasha Siegfried, Matthew R. Zheng, Yixi Villas Bôas, Ana B. Bortolotto, Guilherme A. Boehme, Lars Alley, Karen E. |
author_sort |
Savidge, Elena |
title |
Wintertime polynya structure and variability from thermal remote sensing and seal-borne observations at Pine Island Glacier, West Antarctica |
title_short |
Wintertime polynya structure and variability from thermal remote sensing and seal-borne observations at Pine Island Glacier, West Antarctica |
title_full |
Wintertime polynya structure and variability from thermal remote sensing and seal-borne observations at Pine Island Glacier, West Antarctica |
title_fullStr |
Wintertime polynya structure and variability from thermal remote sensing and seal-borne observations at Pine Island Glacier, West Antarctica |
title_full_unstemmed |
Wintertime polynya structure and variability from thermal remote sensing and seal-borne observations at Pine Island Glacier, West Antarctica |
title_sort |
wintertime polynya structure and variability from thermal remote sensing and seal-borne observations at pine island glacier, west antarctica |
publishDate |
2023 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/wintertime-polynya-structure-and-variability-from-thermal-remote-sensing-and-sealborne-observations-at-pine-island-glacier-west-antarctica(16372782-3535-4dbe-9cab-49b836cb63f4).html https://doi.org/10.1109/TGRS.2023.3271453 https://research-repository.st-andrews.ac.uk/bitstream/10023/27482/1/Savidge_2023_Wintertime_polynya_structure_IEEETGRS_CCBY.pdf |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
geographic |
Antarctic Pine Island Glacier West Antarctica |
geographic_facet |
Antarctic Pine Island Glacier West Antarctica |
genre |
Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Pine Island Pine Island Glacier polar night Sea ice West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Pine Island Pine Island Glacier polar night Sea ice West Antarctica |
op_source |
Savidge , E , Snow , T , Siegfried , M R , Zheng , Y , Villas Bôas , A B , Bortolotto , G A , Boehme , L & Alley , K E 2023 , ' Wintertime polynya structure and variability from thermal remote sensing and seal-borne observations at Pine Island Glacier, West Antarctica ' , IEEE Transactions on Geoscience and Remote Sensing , vol. 61 , 4300813 . https://doi.org/10.1109/TGRS.2023.3271453 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/wintertime-polynya-structure-and-variability-from-thermal-remote-sensing-and-sealborne-observations-at-pine-island-glacier-west-antarctica(16372782-3535-4dbe-9cab-49b836cb63f4).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1109/TGRS.2023.3271453 |
container_title |
IEEE Transactions on Geoscience and Remote Sensing |
container_volume |
61 |
container_start_page |
1 |
op_container_end_page |
13 |
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1802651699083476992 |