Changes in the atmospheric circulation regime versus global climatic trends in the Atlantic-Eurasian sector of the northern hemisphere
S.V. MOROZOVA1, K.E. DENISOV2, E.A. POLYANSKAYA1, K.S. KONDAKOV3, N.V. KOROTKOVA1, R.R. GAFUROV3
1Chernyshevsky Saratov State University, Saratov, Russia
2Vavilov Saratov State University of Genetics, Biotechnology and Engineering, Saratov, Russia
3Russian Research and Design-Technological Institute of Sorghum and Corn, Saratov, Russia
Keywords: Earth’s climate system, global warming, climatic pressure fields, climatic variability, atmospheric circulation
Abstract
We examine changes in the baric field of the AT-500 hPa surface during two natural periods of the Earth’s climate system: the period of stabilization, and the second wave of global warming consisting of the active phase, and the phase of deceleration in warming. The study area includes the Atlantic-Eurasian sector of the hemisphere, which is characterized by the highest weather-climatic instability. The analysis of climatic fields was carried out for January and July. It has been established that both in January and in July, the highest degree of zoning is characteristic of the active phase of the second wave of global warming. In January, a west-east shift of the climatic baric wave from one natural climatic period to another was revealed. The western shift was observed during the period of stabilization and the phase of deceleration in warming. The eastward movement of the wave took place in the active phase of the second wave of global warming. In July, against the background of the west-east shift of the baric wave over most of European Russia, an anticyclonic source was formed during the deceleration in warming, which indicates an increase in the frequency of anticyclones over this territory. It is suggested that such a restructuring of the pressure field contributes to an increase in the role of summer transformation processes in current warming.
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