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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2020, Vol. 17, No. 3, pp. 165-177

Identification of large-scale sea ice ridge areas in the Arctic using ASCAT data

E.V. Zabolotskikh 1 , K.S. Khvorostovsky 1 , E.A. Balashova 1 , A.I. Kostylev 1 , V.N. Kudryavtsev 1, 2 
1 Russian State Hydrometeorological University, Saint Petersburg, Russia
2 Marine Hydrophysical Institute RAS, Sevastopol, Russia
Accepted: 11.12.2019
DOI: 10.21046/2070-7401-2020-17-3-165-177
The study shows the possibility to detect sea ice ridge areas in the Arctic first year and young sea ice using measurements of the Advanced Scatterometer (ASCAT). The general mechanisms of sea ice scattering responsible for radar signal variations are considered. To increase the spatial resolution of the ASCAT measurements and bring the values of the normalized radar backscatter coefficient (NRSC) to a single observation angle, full resolution ASCAT data were used. The resulting daily averaged fields of the normalized NRSC with a resolution of 5×5 km were analyzed simultaneously with Sentinel-1 SAR images, sea ice concentration fields retrieved from the measurements of the Advanced Microwave Scanning Radiometer 2 and sea ice maps of the Arctic and Antarctic Research Institute. The effectiveness of ASCAT data usage for monitoring hummocks is demonstrated. A proposed approach allows using the ASCAT data for the study and operational monitoring of increased ridging areas with the spatial scales exceeding spatial resolution of scatterometer data, variability of which during the day can be neglected. Further development of the approach is associated with an analysis of collocated wind fields as well as the time sequence of the NRSC fields.
Keywords: Arctic, satellite scatterometers, ASCAT, sea ice, sea ice ridges
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