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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. 7, pp. 203-214

The Kara Sea flaw polynya characteristics derived from satellite microwave measurements of sea ice concentration

E.V. Lvova 1 , M.A. Zhivotovskaya 1 , E.V. Zabolotskikh 1 , E.A. Balashova 1 , S.V. Baranovskiy 1 
1 Russian State Hydrometeorological University, Saint Petersburg, Russia
Accepted: 19.10.2020
DOI: 10.21046/2070-7401-2020-17-7-203-214
The paper analyzes the characteristics of the polynyas of the Kara Sea for 15 years (from January 2003 to May 2019, excluding the 2011/2012 season) based on the sea ice concentration fields with a resolution of 6.25×6.25 km according to measurements of satellite microwave radiometers Advanced Microwave Scanning Radiometer for Earth Observing System (AMSR-E) and Advanced Microwave Scanning Radiometer 2 (AMSR2). Polynyas were identified visually in the fields of sea ice concentration, and their characteristics were determined semi-automatically using the tools of the GIS system — the Arctic Portal. Eight groups of polynyas of the Kara Sea are considered according to the regions of formation: Southeast Frantz Josef Land, Northern Novozemel’skaya, South Novozemel’skaya, Amderminskaya, Yamal’skaya, Ob’-Eniseiskaya, Central Karskaya, West Severozemel’skaya. During the observation period, 2109 polynyas were found. The average, maximum values of the areas were calculated and the average lifetime of the polynyas was determined. The results obtained indicate a change in the stability of polynyas formed near Novaya Zemlya in the southwestern part of the sea. In the dynamics of the areas, a positive trend was revealed, indicating an increase in the area of polynyas in the Kara Sea by 3.64 km2 per year. The analysis of the characteristics of the sandy polynyas according to satellite observations allows us to consider the polynyas of the Kara Sea both as a permanent element of ice conditions, contributing to safe and low-cost navigation at sea, and as evidence of the ongoing climatic changes.
Keywords: Arctic Portal, flaw polynyas, Kara Sea, satellite passive microwave remote sensing
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