Eddies in the Marginal Ice Zone of Fram Strait and Svalbard from Spaceborne SAR Observations in Winter
Here we investigate the intensity of eddy generation and their properties in the marginal ice zone (MIZ) regions of Fram Strait and around Svalbard using spaceborne synthetic aperture radar (SAR) data from Envisat ASAR and Sentinel-1 in winter 2007 and 2018. Analysis of 2039 SAR images allowed ident...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-12-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/14/1/134 |
| _version_ | 1797497703623557120 |
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| author | Igor E. Kozlov Oksana A. Atadzhanova |
| author_facet | Igor E. Kozlov Oksana A. Atadzhanova |
| author_sort | Igor E. Kozlov |
| collection | DOAJ |
| description | Here we investigate the intensity of eddy generation and their properties in the marginal ice zone (MIZ) regions of Fram Strait and around Svalbard using spaceborne synthetic aperture radar (SAR) data from Envisat ASAR and Sentinel-1 in winter 2007 and 2018. Analysis of 2039 SAR images allowed identifying 4619 eddy signatures. The number of eddies detected per image per kilometer of MIZ length is similar for both years. Submesoscale and small mesoscale eddies dominate with cyclones detected twice more frequently than anticyclones. Eddy diameters range from 1 to 68 km with mean values of 6 km and 12 km over shallow and deep water, respectively. Mean eddy size grows with increasing ice concentration in the MIZ, yet most eddies are detected at the ice edge and where the ice concentration is below 20%. The fraction of sea ice trapped in cyclones (53%) is slightly higher than that in anticyclones (48%). The amount of sea ice trapped by a single ‘mean’ eddy is about 40 km<sup>2</sup>, while the average horizontal retreat of the ice edge due to eddy-induced ice melt is about 0.2–0.5 km·d<sup>–1</sup> ± 0.02 km·d<sup>–1</sup>. Relation of eddy occurrence to background currents and winds is also discussed. |
| first_indexed | 2024-03-10T03:23:57Z |
| format | Article |
| id | doaj.art-53c4bed1c27f4ff7950f94dbc93c7da2 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-10T03:23:57Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-53c4bed1c27f4ff7950f94dbc93c7da22023-11-23T12:13:41ZengMDPI AGRemote Sensing2072-42922021-12-0114113410.3390/rs14010134Eddies in the Marginal Ice Zone of Fram Strait and Svalbard from Spaceborne SAR Observations in WinterIgor E. Kozlov0Oksana A. Atadzhanova1Marine Hydrophysical Institute of RAS, 299011 Sevastopol, RussiaMarine Hydrophysical Institute of RAS, 299011 Sevastopol, RussiaHere we investigate the intensity of eddy generation and their properties in the marginal ice zone (MIZ) regions of Fram Strait and around Svalbard using spaceborne synthetic aperture radar (SAR) data from Envisat ASAR and Sentinel-1 in winter 2007 and 2018. Analysis of 2039 SAR images allowed identifying 4619 eddy signatures. The number of eddies detected per image per kilometer of MIZ length is similar for both years. Submesoscale and small mesoscale eddies dominate with cyclones detected twice more frequently than anticyclones. Eddy diameters range from 1 to 68 km with mean values of 6 km and 12 km over shallow and deep water, respectively. Mean eddy size grows with increasing ice concentration in the MIZ, yet most eddies are detected at the ice edge and where the ice concentration is below 20%. The fraction of sea ice trapped in cyclones (53%) is slightly higher than that in anticyclones (48%). The amount of sea ice trapped by a single ‘mean’ eddy is about 40 km<sup>2</sup>, while the average horizontal retreat of the ice edge due to eddy-induced ice melt is about 0.2–0.5 km·d<sup>–1</sup> ± 0.02 km·d<sup>–1</sup>. Relation of eddy occurrence to background currents and winds is also discussed.https://www.mdpi.com/2072-4292/14/1/134ocean eddiesmarginal ice zonesea iceSAR imagingFram StraitSvalbard |
| spellingShingle | Igor E. Kozlov Oksana A. Atadzhanova Eddies in the Marginal Ice Zone of Fram Strait and Svalbard from Spaceborne SAR Observations in Winter Remote Sensing ocean eddies marginal ice zone sea ice SAR imaging Fram Strait Svalbard |
| title | Eddies in the Marginal Ice Zone of Fram Strait and Svalbard from Spaceborne SAR Observations in Winter |
| title_full | Eddies in the Marginal Ice Zone of Fram Strait and Svalbard from Spaceborne SAR Observations in Winter |
| title_fullStr | Eddies in the Marginal Ice Zone of Fram Strait and Svalbard from Spaceborne SAR Observations in Winter |
| title_full_unstemmed | Eddies in the Marginal Ice Zone of Fram Strait and Svalbard from Spaceborne SAR Observations in Winter |
| title_short | Eddies in the Marginal Ice Zone of Fram Strait and Svalbard from Spaceborne SAR Observations in Winter |
| title_sort | eddies in the marginal ice zone of fram strait and svalbard from spaceborne sar observations in winter |
| topic | ocean eddies marginal ice zone sea ice SAR imaging Fram Strait Svalbard |
| url | https://www.mdpi.com/2072-4292/14/1/134 |
| work_keys_str_mv | AT igorekozlov eddiesinthemarginalicezoneofframstraitandsvalbardfromspacebornesarobservationsinwinter AT oksanaaatadzhanova eddiesinthemarginalicezoneofframstraitandsvalbardfromspacebornesarobservationsinwinter |