Lidar investigations of sudden stratospheric warmings over Tomsk in winters of 2010/11 and 2011/12.

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   Manifestations of winter stratospheric warming (SW) for 2010/11 and
   2011/12 (January), transition phases from a disturbed vertical temperature
   distribution (VTD) to a stable state (February-March), VTD stabilization
   (April-November) were considered. The both stratospheric warmings referred
   to a minor type, during which air mass circulation rearrangement in the
   stratosphere did not occur¹. The winter warming of 2010/11 was
   registered in January with small positive deviations of temperature from
   average month values in its first decay and than two maximums on January
   14 and 15 at the height of 30-40 km with the deviation up to 45 K. The
   beginning of SW in 2011/12 from lidar measurements was registered on
   December 26 and continued for two decades of January, 2012. The maximal
   development of SW occurred from the end of December, 2011 to the first
   decade of January. The maximum temperature deviations were at the level of
   40-60 K within the heights of 35-45 km.
   ¹http://www.geo.fu-berlin.de/en/met/ag/strat/index.html