Abstract
Western Siberia is a large area in Northern Eurasia, which lies between the Urals and the Yenisei River. The atmospheric blocking events are not a frequent phenomenon in this region. Nevertheless, they noticeably affect the weather and living conditions of people there. We have investigated 14 winter blocking events, identified over Western Siberia, over 2004–2016, and have studied their effect on the surface temperature in this region. We have compared each of the 14 blocking events to the corresponding surface temperature anomalies in the north and in the south of Western Siberia. As a result, the temperature anomalies were separated into two groups: (1) dipole, with a positive surface temperature anomaly (or close to the norm) in the north, and with a negative anomaly (or close to the norm) in the south, and (2) non-dipole. Ten events were attributed to Group 1, four events were referred to Group 2. Analyzing the potential temperature on the dynamic tropopause (advection characteristic) showed that the Group 1 events feature strong advection over the investigated territory. In the non-dipole situations from Group 2 Western Siberia are away from strong blocking events.
Highlights
Atmospheric blocking is one of the most dramatic phenomena of large-scale circulation in the middle troposphere at mid and high latitudes [1,2]
The blockings detected over Western Siberia determine the temperature anomalies over a correlation field over Western Siberia has a dipole pattern
One can see that the correlation field over the surface temperature corresponds to the increase in the blocking frequency, whereas in the south, Western Siberia has a dipole pattern
Summary
Atmospheric blocking is one of the most dramatic phenomena of large-scale circulation in the middle troposphere at mid and high latitudes [1,2]. F. Rex, the westerly jet separation into two branches enveloping the blocking region [3]. It is accepted that a necessary blocking component is the presence of a large-amplitude equivalent-barotropic anticyclone [4]. Depending on the pressure field configuration, there are two main types of blockings [4]: monopole and dipole. A monopole blocking (Omega-blocking, Ω) represents an intensified high pressure ridge, at whose basis, there are two atmospheric troughs on either side. The westerly flow and the eastward displacement of the weather systems are interrupted. Thereby, blockings essentially affect the Atmosphere 2018, 9, 72; doi:10.3390/atmos9020072 www.mdpi.com/journal/atmosphere
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
