Ice age composition in the Barents sea

• Published in: Monthly Notices of the Royal Astronomical Society
• Main Authors: E. S. Egorova, Y. U. Mironov, Е. С. Егорова, Е. У. Миронов
• Other Authors: The work was supported by the Russian Science Foundation within the framework of the scientific project No. 22-27-00443., Работа выполнена при финансовой поддержке Российского научного фонда в рамках научного проекта № 22-27-00443.
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: Государственный научный центр Российской Федерации Арктический и антарктический научно-исследовательский институт 2022
• Subjects: сезонные изменения; ice age composition; ice cover; interannual changes; seasonal changes; winter period; возрастная структура льдов; зимний период; ледяной покров; межгодовые изменения; Arctic; Antarctic; Barents Sea; Antarc*; Arctic and Antarctic Research Institute; Sea ice
• Online Access: https://www.aaresearch.science/jour/article/view/455; https://doi.org/10.30758/0555-2648-2022-68-3-216-233

The paper presents the key results of investigating Barents Sea ice age composition during the winter season, from the beginning of ice formation in October to its termination in May. To analyze the seasonal and interannual changes in the amount of ice of different age categories, we used ice charts for the Barents Sea for the period 1997–2021, produced by the Arctic and Antarctic Research Institute. The age composition of the ice cover in the Barents Sea is represented by seven standard ice categories (thickness ranges). The areas of ice of different age categories were calculated for a ten-day time interval (in percentage of the total ice area). The results are provided for three parts of the Barents Sea: western, northeastern and southeastern.The interannual changes in the amount of ice in relative fractions of ice of different age categories in the ice cover of the Barents Sea do not show significant trends for the period 1997–2021. Thus, with the observed reduction in the Barents Sea total ice area, the amount of ice of different age categories ranges within the limits of its own natural variability. Therefore, it is impossible to draw a definite conclusion about a decrease in ice cover thickness in the Barents Sea based only on data on the ice age composition over a 24-year period of observations analyzed in this study. On comparing the estimates obtained in this study of the age structure of the ice cover in the Barents Sea with those of the previous studies on this subject, we can argue that its average thickness at the beginning of the 21st century decreased, compared to the period 1971–1976. Taking into account the statistical insignificance of the trends in interannual variations in the amount of ice of different age gradations, one can maintain that quantitative changes in the age structure of the Barents Sea ice cover began earlier than 1997. В настоящей работе для периода 1997–2021 гг. была произведена оценка сезонных и межгодовых изменений возрастной структуры ледяного покрова Баренцева моря в ...