Applied Research in Geographical Sciences

Applied Research in Geographical Sciences

Investigating the variability of the Siberian high pressure intensity in relation to the anomalous winter circulation of the atmosphere

Articles in Press
Authors
atefeh rezaei talei 1
Buhlol Alijani 1
hematolah roradeh 2
taher safarrad 2
1 kharazmi university
2 mazandaran university
Abstract
The role of regional and extra-regional forcings causes changes in the Siberian high-pressure cyclonic circulation every year. In this regard, an attempt was made to investigate the variability of the intensity of the Siberian high pressure in relation to the abnormal winter circulation of the atmosphere. For this purpose, gridded data of sea level pressure, geopotential height, orbital and meridional wind components of Center for Environmental Prediction/Atmospheric Sciences (NCEP/NCAR) between the years until 2020 (December to February) were used. After applying the Siberian high pressure intensity index, the extreme periods of this high pressure in winter were extracted. Next, the development of this system and the systems affecting the Siberian high pressure were investigated using the quantity of relative Vorticity advection. The results showed that during the winter period, the high pressure center of Siberia has undergone changes and has taken on a growing trend between 4 and 6 hectopascals. On the other hand, it was observed that the role of atmospheric systems such as dynamic ridges on the Siberian region along with advection The negative relative humidity, the location of the Siberian region in the east of the ridge, and the formation of omega bands play an important role in strengthening this system, which has caused this high pressure to develop from east to west or north to south. On the other hand, the role of the polar vortex in the cold advections of the region and the displacement towards the equator has caused the Siberian high pressure to sometimes increase by more than 11 hectopascals compared to its long-term average. Finally, it was observed that the atmospheric circulation in mid-latitudes plays a transitional role in the high pressure changes in Siberia and the polar and subpolar currents.
Keywords
Siberian high-pressure
Atmospheric Circulation
Vorticity advection
Polar vortex
Anomaly
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Applied Research in Geographical Sciences

Articles in Press, Accepted Manuscript
Available Online from 21 March 2007