Reiteration of the Elementary Circulation Mechanisms in the Atmosphere of the Northern Hemisphere
https://doi.org/10.1134/S2587556618060080
Abstract
The oscillations of the atmospheric circulation of the Northern Hemisphere in the period 1899–2016 according to the classification of B.L. Dzerdzeevskii, V.M. Kurganskaya, Z.M. Vitvitskaya were studied in the paper. The reiteration of switches of the elementary circulation mechanisms (ECMs) into each other during the study period was analyzed and the differences in the alternation of the ECMs in the three circulation epochs were determined. During the study the most common, as well as not occurring switches were identified. In addition, it was found that in the transition from the meridional epoch to the zonal there was not only a general decrease in the duration of meridional processes, but also changes in the structure of the meridional group were observed. Reduction of the reiteration of the ECMs with three and two far removed from each other blocking processes (on Siberia and America or on Europe and America) was accompanied by the growth of the reiteration of the ECMs with two closely spaced blocking processes (for example, on the Atlantic and Europe). The results of the analysis show the increase in the instability of atmospheric processes during the second half of the 20th century, and especially in the last 19 years. The significant decrease in the share of the ECM switches with blocking processes with preservation of the previous process elements more than twice during the period from the first to the third circulating epoch also indicates an increase in the instability of the atmosphere, which leads to an increase in the reiteration of extreme weather events in Russia.
Keywords
global atmospheric circulation,
reiteration of elementary circulation mechanisms,
climate change,
Northern Hemisphere
Supporting agencies: Analysis of circulation regimes at high latitudes was fulfilled with financial support of the Russian Science Foundation, project no. 14-17- 00647; the study of transitions of ECM in subarctic regions, leading to increased frequency of extreme weather and climate events was supported by the Russian Foundation for Basic Research, project no. 18- 05-60216, and by RAS Presidium program № 51 – in the south of European Russia and in the Russian Far East.
About the Authors
N. K. Kononova
Institute of Geography, Russian Academy of Sciences
Russian Federation
Russian Federation
E. A. Cherenkova
Institute of Geography, Russian Academy of Sciences
Russian Federation
Russian Federation
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Supplementary files
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1. The most frequent transitions (%) ECM of different groups in ECM with cyclone at the pole (13s) in summer in the last circulation epoch: 1 – zonal group, 2 – disturbans of zonal, 3 – northern meridional group | |
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| Type | Исследовательские инструменты | |
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Indexing metadata ▾ | |
- The frequency of transitions of elementary circulation mechanisms (ECM) to each other from 1899 to 2016 was analysed on the basis of the classification by B.L. Dzerdzeevskii.
- Differences in reiteration of ECM for three circulation epochs: meridional northern (1899–1915), zonal (1916–1956), meridional southern (1957–2016).
- The frequency of ‘random’ transitions, with low frequency, has increased. An increase in the volatility of atmospheric processes over the past decades.
- More than two-fold reduction of share of such ECM transitions, in which the elements of the previous process were preserved, is associated with a present increase in the frequency of extreme weather and climate phenomena.
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For citations:
Kononova N.K., Cherenkova E.A. Reiteration of the Elementary Circulation Mechanisms in the Atmosphere of the Northern Hemisphere. Izvestiya Rossiiskoi Akademii Nauk. Seriya Geograficheskaya. 2018;(6):17-25. (In Russ.) https://doi.org/10.1134/S2587556618060080
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