Аge composition of the sea ice in southwestern part of the Chukchi Sea in the autumn-winter period
https://doi.org/10.30758/0555-2648-2023-69-3-331-342
Abstract
Age composition is the main characteristic of the ice cover of the Arctic seas in the autumn-winter period. The article presents the results of a study of the seasonal course and interannual changes in the age composition of ice in the southwestern part of the Chukchi Sea in the autumn-winter period for a number of years 1997–2022. The results obtained made it possible to reveal patterns of accumulation and change of ice of various ages.
A well-pronounced seasonal course is observed in the development of the ice cover in the southwestern part of the Chukchi Sea. From the beginning of ice formation to mid-December, young ice (10–30 cm) predominates. From the beginning of January, one-year thin ice (30–70 cm) prevails. From February, first-year average ice (70–120 cm) begins to prevail. At the end of the period of ice cover growth, which occurs in mid-May, one-year medium and thick ice (more than 120 cm) predominate. Their total amount is 71 % of the total ice composition.
Quantitative changes in ice of different ages in the sea waters allow us to determine the average dates of transitions of types of complexity of ice conditions from light to severe. On average, the transition from mild to medium occurs in the first decade of February, and from medium to severe in the second decade of April.
An analysis of interannual changes in the age composition of ice over a 25-year observation period made it possible to establish a trend towards the replacement of old and thick ice by thinner one-year average and young ice.
Previously, similar studies in the southwestern part of the Chukchi Sea were not carried out. The results obtained make it possible to acquire knowledge about the development of ice cover in winter and use it in the development of methods for ice forecasts for shipping.
Supporting agencies: This work was funded by the project 5.1.2 NITR Roshydromet
About the Authors
T. V. Sheveleva
State Scientific Center of the Russian Federation Arctic and Antarctic Research Institute
Russian Federation
Russian Federation
Tatyana V. Sheveleva
St. Petersburg
A. V. Yulin
State Scientific Center of the Russian Federation Arctic and Antarctic Research Institute
Russian Federation
Russian Federation
Alexander V. Yulin
St. Petersburg
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For citations:
Sheveleva T.V., Yulin A.V. Аge composition of the sea ice in southwestern part of the Chukchi Sea in the autumn-winter period. Arctic and Antarctic Research. 2023;69(3):331-342. (In Russ.) https://doi.org/10.30758/0555-2648-2023-69-3-331-342
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