Ice Production in Ross Ice Shelf Polynyas during 2017–2018 from Sentinel–1 SAR Images
High sea ice production (SIP) generates high-salinity water, thus, influencing the global thermohaline circulation. Estimation from passive microwave data and heat flux models have indicated that the Ross Ice Shelf polynya (RISP) may be the highest SIP region in the Southern Oceans. However, the coa...
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ftdoajarticles:oai:doaj.org/article:6ca8577c7dcb474c8a8e10f6e53a33c5 2023-05-15T16:41:53+02:00 Ice Production in Ross Ice Shelf Polynyas during 2017–2018 from Sentinel–1 SAR Images Liyun Dai Hongjie Xie Stephen F. Ackley Alberto M. Mestas-Nuñez 2020-05-01T00:00:00Z https://doi.org/10.3390/rs12091484 https://doaj.org/article/6ca8577c7dcb474c8a8e10f6e53a33c5 EN eng MDPI AG https://www.mdpi.com/2072-4292/12/9/1484 https://doaj.org/toc/2072-4292 doi:10.3390/rs12091484 2072-4292 https://doaj.org/article/6ca8577c7dcb474c8a8e10f6e53a33c5 Remote Sensing, Vol 12, Iss 1484, p 1484 (2020) polynya ice production SAR Sentinel-1 sea ice AMSR-2 Science Q article 2020 ftdoajarticles https://doi.org/10.3390/rs12091484 2022-12-31T16:12:22Z High sea ice production (SIP) generates high-salinity water, thus, influencing the global thermohaline circulation. Estimation from passive microwave data and heat flux models have indicated that the Ross Ice Shelf polynya (RISP) may be the highest SIP region in the Southern Oceans. However, the coarse spatial resolution of passive microwave data limited the accuracy of these estimates. The Sentinel-1 Synthetic Aperture Radar dataset with high spatial and temporal resolution provides an unprecedented opportunity to more accurately distinguish both polynya area/extent and occurrence. In this study, the SIPs of RISP and McMurdo Sound polynya (MSP) from 1 March–30 November 2017 and 2018 are calculated based on Sentinel-1 SAR data (for area/extent) and AMSR2 data (for ice thickness). The results show that the wind-driven polynyas in these two years occurred from the middle of March to the middle of November, and the occurrence frequency in 2017 was 90, less than 114 in 2018. However, the annual mean cumulative SIP area and volume in 2017 were similar to (or slightly larger than) those in 2018. The average annual cumulative polynya area and ice volume of these two years were 1,040,213 km 2 and 184 km 3 for the RSIP, and 90,505 km 2 and 16 km 3 for the MSP, respectively. This annual cumulative SIP (volume) is only 1/3–2/3 of those obtained using the previous methods, implying that ice production in the Ross Sea might have been significantly overestimated in the past and deserves further investigations. Article in Journal/Newspaper Ice Shelf McMurdo Sound Ross Ice Shelf Ross Sea Sea ice Directory of Open Access Journals: DOAJ Articles Ross Sea McMurdo Sound Ross Ice Shelf The Sentinel ENVELOPE(73.317,73.317,-52.983,-52.983) Remote Sensing 12 9 1484 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
polynya ice production SAR Sentinel-1 sea ice AMSR-2 Science Q |
spellingShingle |
polynya ice production SAR Sentinel-1 sea ice AMSR-2 Science Q Liyun Dai Hongjie Xie Stephen F. Ackley Alberto M. Mestas-Nuñez Ice Production in Ross Ice Shelf Polynyas during 2017–2018 from Sentinel–1 SAR Images |
topic_facet |
polynya ice production SAR Sentinel-1 sea ice AMSR-2 Science Q |
description |
High sea ice production (SIP) generates high-salinity water, thus, influencing the global thermohaline circulation. Estimation from passive microwave data and heat flux models have indicated that the Ross Ice Shelf polynya (RISP) may be the highest SIP region in the Southern Oceans. However, the coarse spatial resolution of passive microwave data limited the accuracy of these estimates. The Sentinel-1 Synthetic Aperture Radar dataset with high spatial and temporal resolution provides an unprecedented opportunity to more accurately distinguish both polynya area/extent and occurrence. In this study, the SIPs of RISP and McMurdo Sound polynya (MSP) from 1 March–30 November 2017 and 2018 are calculated based on Sentinel-1 SAR data (for area/extent) and AMSR2 data (for ice thickness). The results show that the wind-driven polynyas in these two years occurred from the middle of March to the middle of November, and the occurrence frequency in 2017 was 90, less than 114 in 2018. However, the annual mean cumulative SIP area and volume in 2017 were similar to (or slightly larger than) those in 2018. The average annual cumulative polynya area and ice volume of these two years were 1,040,213 km 2 and 184 km 3 for the RSIP, and 90,505 km 2 and 16 km 3 for the MSP, respectively. This annual cumulative SIP (volume) is only 1/3–2/3 of those obtained using the previous methods, implying that ice production in the Ross Sea might have been significantly overestimated in the past and deserves further investigations. |
format |
Article in Journal/Newspaper |
author |
Liyun Dai Hongjie Xie Stephen F. Ackley Alberto M. Mestas-Nuñez |
author_facet |
Liyun Dai Hongjie Xie Stephen F. Ackley Alberto M. Mestas-Nuñez |
author_sort |
Liyun Dai |
title |
Ice Production in Ross Ice Shelf Polynyas during 2017–2018 from Sentinel–1 SAR Images |
title_short |
Ice Production in Ross Ice Shelf Polynyas during 2017–2018 from Sentinel–1 SAR Images |
title_full |
Ice Production in Ross Ice Shelf Polynyas during 2017–2018 from Sentinel–1 SAR Images |
title_fullStr |
Ice Production in Ross Ice Shelf Polynyas during 2017–2018 from Sentinel–1 SAR Images |
title_full_unstemmed |
Ice Production in Ross Ice Shelf Polynyas during 2017–2018 from Sentinel–1 SAR Images |
title_sort |
ice production in ross ice shelf polynyas during 2017–2018 from sentinel–1 sar images |
publisher |
MDPI AG |
publishDate |
2020 |
url |
https://doi.org/10.3390/rs12091484 https://doaj.org/article/6ca8577c7dcb474c8a8e10f6e53a33c5 |
long_lat |
ENVELOPE(73.317,73.317,-52.983,-52.983) |
geographic |
Ross Sea McMurdo Sound Ross Ice Shelf The Sentinel |
geographic_facet |
Ross Sea McMurdo Sound Ross Ice Shelf The Sentinel |
genre |
Ice Shelf McMurdo Sound Ross Ice Shelf Ross Sea Sea ice |
genre_facet |
Ice Shelf McMurdo Sound Ross Ice Shelf Ross Sea Sea ice |
op_source |
Remote Sensing, Vol 12, Iss 1484, p 1484 (2020) |
op_relation |
https://www.mdpi.com/2072-4292/12/9/1484 https://doaj.org/toc/2072-4292 doi:10.3390/rs12091484 2072-4292 https://doaj.org/article/6ca8577c7dcb474c8a8e10f6e53a33c5 |
op_doi |
https://doi.org/10.3390/rs12091484 |
container_title |
Remote Sensing |
container_volume |
12 |
container_issue |
9 |
container_start_page |
1484 |
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1766032355384885248 |