Assessment of the Arctic Oscillation influence on the formation of the Arctic Ocean circulation regimes for the last decades

E. E. Lemeshko

doi:10.1117/12.2603394

15 December 2021 Assessment of the Arctic Oscillation influence on the formation of the Arctic Ocean circulation regimes for the last decades

E. E. Lemeshko

Author Affiliations +

Proceedings Volume 11916, 27th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics; 119166G (2021) https://doi.org/10.1117/12.2603394
Event: 27th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, 2021, Moscow, Russian Federation

Abstract

The interannual variability of the Arctic Ocean level is largely determined by the wind impact, which is modulated by the Arctic Oscillation. This paper is the first to study the long-term variability of the ocean level depending on the phase of the Arctic Oscillation for 1950-2012. It is shown that the ocean circulation regimes are mainly represented by two types: cyclonic during the positive phase of the Arctic Oscillation and anticyclonic during the negative phase. The maximum manifestations of these phenomena intensified after 2000. The positive values of the linear trend coefficients of the level reached 4-5 mm / year and are localized in the area of the Beaufort Gyre. This region corresponds to the values of 70-75% of the contribution of the low-frequency signal variability to the variance of the sea level. In the East Siberian Sea, the estimates of the linear trend of the level also reach 4-5 mm / year, which is due to an increase in the runoff of the Siberian rivers. However, the nature of the processes in this area is intraseasonal, because it corresponds to 30-40% of the contribution of low-frequency signal variability to sea level dispersion.

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E. E. Lemeshko "Assessment of the Arctic Oscillation influence on the formation of the Arctic Ocean circulation regimes for the last decades", Proc. SPIE 11916, 27th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, 119166G (15 December 2021); https://doi.org/10.1117/12.2603394

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