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Proceedings 2017, 1(5), 198; doi:10.3390/ecas2017-04127

Wintertime Atmospheric Blocking Events over Western Siberia in the Period 2004–2016 and Their Influence on the Surface Temperature Anomalies

1
V.E. Zuev Institute of Atmospheric Optics SB RAS, Academician Zuev Square 1, Tomsk 634021, Russia
2
Institute of Solar-Terrestrial Physics, SB RAS, Lermontov st., 126a, Irkutsk 664033, Russia
3
Institute of Monitoring of Climatic and Ecological Systems SB RAS, 10/3, Academichesky, Tomsk 634055, Russia
4
Siberian Regional Hydrometeorological Research Institute, Sovetskaya 30, Novosibirsk 630099, Russia
Presented at the 2nd International Electronic Conference on Atmospheric Sciences, 16–31 July 2017; Available online: http://sciforum.net/conference/ecas2017.
*
Author to whom correspondence should be addressed.
Published: 17 July 2017
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Abstract

We study wintertime blocking events in 2004–2016 over Western Siberia (WS) and their influence on the surface temperature. The period 2004–2016 is very interesting for study because there has been an increase in the blocking frequency over WS beginning with 2004. We used data ECMWF ERA-Interim and blocking criterion proposed by Tibaldi and Molteni. We investigated blockings events with duration of 5 days or more for winter interval (1 November–31 March). We have chosen 15 blockings events. For each event we calculate surface temperature anomaly in the grid points for two sectors 60–90 E; 50–60 N (southern part of WS) and 60–90 E; 60–70 N (northern part of WS). To estimate advective transfer for studied events we analyzed the potential temperature on the dynamical tropopause. We showed that wintertime blocking events over WS lead to the surface temperature increase in the northern part of West Siberia and to the surface temperature decrease in the southern part of WS. This feature apparently due to warm air masses advection from south-west on the western periphery of the blocking ridge and arctic air masses intrusion to the southern part of the WS on the eastern periphery of this ridge.
Keywords: atmospheric blocking; wintertime circulation; surface temperature anomaly; cold winter atmospheric blocking; wintertime circulation; surface temperature anomaly; cold winter
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yu, A.O.; N., A.P.; V., D.E.; V., M.Y. Wintertime Atmospheric Blocking Events over Western Siberia in the Period 2004–2016 and Their Influence on the Surface Temperature Anomalies. Proceedings 2017, 1, 198.

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