ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2020, Vol. 17, No. 7, pp. 178-186

Winter-time observations of eddies in Fram Strait and around Svalbard using spaceborne SAR data

O.A. Atadzhanova 1 , I.E. Kozlov 2 
1 Shirshov Institute of Oceanology RAS, Moscow, Russia
2 Marine Hydrophysical Institute RAS, Sevastopol, Russia
Accepted: 15.10.2020
DOI: 10.21046/2070-7401-2020-17-7-178-186
In this work we analyze the spatial distribution of surface eddy signatures and their spatio-temporal properties in Fram Strait and around Svalbard in winter season of 2006–2007 using spaceborne Envisat ASAR data. During the winter season, eddies are primarily detected within the marginal ice zone (MIZ) (94 % out of total eddy number), where their surface signatures are formed due to horizontal redistribution of low concentration ice fields. Compared to summer season, higher near-surface winds during winter preclude the observations of eddies over open ocean regions. As shown, the observed eddy diameters range between 1 km and 67 km, and cyclonic eddies clearly dominate in the record. More than 60 % of all eddies have diameter values below 10 km and are registered over the shelf. Larger eddies with diameter values above 20 km are found in the MIZ over depths exceeding 1000 m. Regions of high eddy probability are found over MIZ regions in the western Fram Strait, near Hopen Island, in Storfjorden and north of Bear Island. Comparison with the recent results of summer-time SAR observations over the study region shows that key regions of eddy activity partly overlap, while the horizontal scales of MIZ eddies observed in Fram Strait are similar to those identified over other Arctic regions.
Keywords: ocean eddies, marginal ice zone, submesoscales, Arctic Ocean, Fram Strait, Svalbard, sea ice, spaceborne SAR images
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