Changes of the atmospheric circulation patterns over Northern Hemisphere extratropical zone since the mid of XX century

V. V. Popova; D. D. Bokuchava

doi:10.1117/12.2540953

18 December 2019 Changes of the atmospheric circulation patterns over Northern Hemisphere extratropical zone since the mid of XX century

V. V. Popova, D. D. Bokuchava

Author Affiliations +

Proceedings Volume 11208, 25th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; 112088A (2019) https://doi.org/10.1117/12.2540953
Event: XXV International Symposium, Atmospheric and Ocean Optics, Atmospheric Physics, 2019, Novosibirsk, Russian Federation

Abstract

Empirical orthogonal functions (EOF) of the geopotential height of 500 hPa variability over the extratropical zone of the Northern Hemisphere in winter season on the base of 30-year running periods are examined in order to reveal change in the atmospheric circulation patterns for 1948-2018. Analysis of the first EOF patterns and their features associated with changes in the intensity and localization of the atmospheric centers of action shows significant shifts the regional structure of the geopotential height anomalies. Comparison of the first five EOFs contribution to the total variability for two periods: 1968-1997 (warming of temperate NH latitudes) and 1988-2017 (sharp warming of the Arctic), reveals definite changes in the structure of circulation variability at the turn of the 20th and 21st centuries, primarily the prevalence of their negative phase occurrence and the increasing role of regional centers of action, in particular ЭОΦ3 responsible for 56% of temperature variability in the northeast Atlantic and over the Barents sea.

Citation Download Citation

V. V. Popova and D. D. Bokuchava "Changes of the atmospheric circulation patterns over Northern Hemisphere extratropical zone since the mid of XX century", Proc. SPIE 11208, 25th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 112088A (18 December 2019); https://doi.org/10.1117/12.2540953

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