The variability of ice conditions along the Northern sea route for the period 1997–2018
https://doi.org/10.30758/0555-2648-2019-65-3-328-340
Abstract
The paper discusses the methodology and results of electronic ice charts processing. The charts taken from AARI archive. The Barents, Kara, Laptev, East Siberian and Chukchi seas Ice maps reflect ice conditions for the period from 1997 to 2018 for the April-May inter-annual interval. The total stage lengths of «Sabetta – the Kara Gate –Murmansk» and «Sabetta – the Vilkitski Strait – the Bering Strait» standard routes were calculated at certain conditions of ice navigation. The route “Sabetta – the Bering Strait” was divided into sections within the Kara sea, Laptev Sea, East Siberian and Chukchi Seas for analysis. The purpose of the study is to obtain the values of the length of the routes in different categories of ice and to analyze changes trend of navigation in ice conditions for the period 1997-2018. The series were checked for the presence of trends using the integral curves method. The homogeneity of the series was checked using Wilcoxon - Mann-Whitney and Siegel - Tukey rank non-parametric criteria. Most of the series proved to be non-homogeneous. The following conclusions were made: there was some improvement of ice navigation conditions along the route Sabetta ‒ the Kara Gate – Murmansk due to the decrease of the route length in hard ice conditions. The ice navigation conditions along the Sabetta ‒ the Bering Strait route changed little, if at all, the navigation conditions along the route within the Kara Sea and the Laptev Sea have changed for the worse, and within the East Siberian Sea ice conditions scarcely changed. Some slight improvement of the navigation conditions was noted within the Chukchi Sea. In general, the decrease of the route Sabetta – the Bering Strait length in compact drift ice with total concentration equal to 9 tenths or more and in the presence of old ice is partially compensated by increase of the route length in compact ice in the presence of thick first-year ice. The decrease and the increase are relatively equal.
Supporting agencies: The work was performed in accordance with the Roshydromet Targeted Scientific and Technical Program (TSTP) 1.5.3.6 «The Russian Arctic seas under present climatic conditions»
About the Authors
V. Yu. Tretyakov
State Scientific Center of the Russian Federation Arctic and Antarctic Research Institute; Institute of Earth Sciences, Saint Petersburg State University
Russian Federation
Russian Federation
St. Petersburg.
S. V. Frolov
State Scientific Center of the Russian Federation Arctic and Antarctic Research Institute
Russian Federation
Russian Federation
St. Petersburg.
M. I. Sarafanov
State Scientific Center of the Russian Federation Arctic and Antarctic Research Institute; Institute of Earth Sciences, Saint Petersburg State University
Russian Federation
Russian Federation
St. Petersburg.
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For citations:
Tretyakov V.Yu., Frolov S.V., Sarafanov M.I. The variability of ice conditions along the Northern sea route for the period 1997–2018. Arctic and Antarctic Research. 2019;65(3):328-340. (In Russ.) https://doi.org/10.30758/0555-2648-2019-65-3-328-340
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