ICE-FREE PERIOD IN THE EAST SIBERIAN SEA ACCORDING TO COASTAL AND REMOTE SENSING OBSERVATIONS

Authors

  • P. A. Shabanov Shirshov Institute of Oceanology, Russian Academy of Sciences

DOI:

https://doi.org/10.29006/1564-2291.JOR-2025.53(4).5

Keywords:

ice-free period, climate change, sea ice, East Siberian Sea, coastal observations, coastal zone, sea ice concentration, passive microwave remote sensing

Abstract

Based on ice events observations and remote sensing data at 5 coastal stations in the East Siberian Sea, the long-term means and trends were calculated for start dates, end dates and duration of ice-free period (IFP) for the period 1997–2023. These values were compared with the calculations based on remote passive microwave sensing data. No statistically significant changes in IFP duration were found at any of the 5 stations. However, 4 of the 5 stations showed statistically significant shifts in end dates to a later time, while there were no significant changes in start dates. It has been shown that the calculations of the long-term means and trends for the start6 end IFP dates and IFP duration, using the 15 % threshold method and modified threshold method, show similar results, agree with each other and significantly differ from coastal observation data for the East Siberian Sea coastal zone. The long-term means of IFP duration are consistently underestimated according to remote sensing data. The calculated from remote sensing data IFP duration trends show statistically significant increase for 1997–2023 period at 4 out of 5 stations.

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Published

2025-12-21

Issue

Vol. 53 No. 4 (2025): Journal of Oceanological Research

Section

Ocean physics and climate

License

Transfer of copyrights occurs on the basis of a license agreement between the Author and Shirshov Institute of Oceanology, RAS

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