VARIABILITY OF THE ICE CONDITIONS IN THE CHUKCHI SEA AND THEIR LINKS WITH ARCTIC OSCILLATION

Variability of the ice conditions in the Chukchi Sea is considered in various scales on the basis of all available information for 1950–2017. Its dependence on the atmospheric circulation patterns measured with the Arctic Oscillation index is shown. Tendency to the ice reducing has intensified in the early 21^st century in the Chukchi Sea that is accompanied with changes in its seasonal development, as shift of the ice destruction beginning from June to July, gradual increasing of the ice destruction rate till September, shift of the ice formation beginning from September to October, and delay of the ice spreading over entire sea area from November to December. Relationship of the ice conditions in the Chukchi Sea on summer phase of Arctic oscillation is detected: the maximum positive values of the index always correspond with heavy ice conditions, the minimum values of the index correspond with low-ice conditions only, and various ice conditions are observed in other years without neither positive nor negative extremities of Arctic oscillation. However, winter phase of Arctic oscillation does not affect on the ice conditions in the Chukchi Sea in June-November.

1. Alekseev, G.V., Aleksandrov, E.I., Glock, N.I., Ivanov, N.E., Smolyanitsky, V.M., Harlanenkova, N.E., and Yulin, A.V., The evolution of the Arctic sea ice cover in modern climate change, Issledovaniye Zemli iz kosmosa, 2015а, no. 2, pp. 5–19. doi 10.7868/S0205961415020025

2. Alekseev, G.V., Radionov, V.F., Aleksandrov, E.I., Ivanov, N.E., and Harlanenkova, N.E., Climate change in the Arctic during global warming, Problemy Arktiki i Antarktiki, 2015b, no. 1(103), pp. 32–41.

3. Alekseev, G.V., Radionov, V.F., Smolyanitsky, V.M., and Filchuk, K.V., Results and prospects of the climatestudies and climate service in the Arctic, Problemy Arktiki i Antarktiki, 2018, vol. 64, no. 3(117), pp. 262–269. doi 10.30758/0555-2648-2018-64-3-262-269

4. Dobrovolsky, A.D. and Zalogin, B.S., Morya SSSR (Seas of USSR), Moscow: Mosk. Gos. Univ., 1982.

5. Dumanskaya, I.O., Ledovye usloviya morey aziatskoy chasti Rossii (Ice conditions of the seas of the Asian part of Russia), Moscow; Obninsk: IG-SOCIN, 2017.

6. Kattsov, V.M. and Porfiryev, B.N., Climate change in the Arctic: the consequences for the environment and the economy, Arktika: ekologiya i ekonomika, 2012, no. 2(6), pp. 66–79.

7. Plotnikov, V.V.,Izmenchivost ledovykh usloviy dalnevostochnykh morey Rossii i ikh prognoz (Variability of ice conditions in the Russian Far Eastern seas and their prediction), Vladivostok: Dalnauka, 200.

8. Plotnikov, V.V., The evolution of ice conditions in the Chukchi Sea in the second half XX century, Morskie issledovaniya v Arktike: Trudy Arkticheskogo Regionalnogo Tsentra, Vladivostok: Dalnauka, 2006, vol. 4, p. 14–23.

9. Plotnikov, V.V., Vakulskaya, N.M., and Lukyanova, N.B., Variability of ice conditions in the Chukchi Sea and connection with large-scale atmospheric circulation, Russ. Meteorol. Hydrol., 2006, no. 12, pp. 65–74.

10. Plotnikov, V.V. and Pustoshnova, V.I., Variability and conjugacy of ice conditions in the system of east arctic seas (the Laptev, East Siberian, and Chukchi Seas), Russ. Meteorol. Hydrol., 2012, vol. 37, no. 7, pp. 468–476.

11. Surkova, G.V. and Krylov, A.A., Changes in average and extreme wind speeds in the Arctic at the end of the 21st century, Arktika i Antarktika, 2018, no. 3, pp. 26–36. doi 10.7256/2453-8922.2018.3.27395

12. Wilkes, S., Matematicheskaya statistika (Mathematical Statistics), Moscow: Nauka, 1967.

13. Formirovanie i dinamika sovremennogo klimata Arktiki (Formation and dynamics of the modern Arctic climate), Alekseev, G.V., ed., St. Petersburg: Gidrometeoizdat, 2004.

14. Frolov, I.E., Gudkovich, Z.M., Karklin, V.P., Kovalev, Y.G., and Smolyanitsky, V.M., Climatic changes of ice conditions in the Arctic seas of the Euroasian shelf, Problemy Arktiki i Antarktiki, 2007, no. 1(75), pp. 149–160.

15. Shalina, E.V., Ice retreat in the seas of the Russian Arctic and increased availability of the Northern sea route from satellite passive microwave observations, Issledovanie Zemli iz kosmosa, 2015, no. 4, pp. 67–78. doi 10.7868/S0205961415040090

16. Yulin, A.V., Sharatunova, M.V., Pavlova, E.A., and Ivanov, V.V., Seasonal and interannual changes of ice massifs in East Siberian Sea, Problemy Arktiki i Antarktiki, 2018, vol. 64, no. 3(117), pp. 229–240. doi 10.30758/0555-2648-2018-64-3-229-240

17. Kwok, R., Cunningham, G.F., Wensnahan, M., Rigor, I., Zwally, H.J., and Yi, D., Thinning and volume loss of the Arctic Ocean sea ice cover: 2003–2008, J. Geophys. Res., 2009, vol. 114, pp. C07005. doi 10.1029/2009JC005312

18. Kodera, K. and Kuroda, Y., A possible mechanism of solar modulation of the spatial structure of the North Atlantic Oscillation, J. Geophys. Res., 2005, vol. 110, pp. D02111. doi 10.1029/2004JD005258

19. Thompson, D.W.J. and Wallace, J.M., Annular modes in the extratropical circulation. Part I: Month-to-month variability, J. Clim., 2000, vol. 13, pp. 1000−1016.

20. Elektronnyy klimaticheskiy okeanograficheskiy atlas Severnogo Ledovitogo okeana (zimniyе i letniyе usloviya na 2-kh kompakt-diskakh) (Electronic climate oceanographic atlas of the Arctic Ocean (winter and summer conditions on 2 CDs)), US National Snow and Ice Data Center, AARI, 1998.