Disturbance of the stratosphere over Tomsk in winter 2017/2018 using lidar and Aura MLS/OMI observations
O.E. Bazhenov, A.A. Nevzorov, A.V. Nevzorov, S.I. Dolgii, A.P. Makeev
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: лидар, спутник Aura, стратосферный аэрозольный слой, озон, внезапное стратосферное потепление, солнечное освещение, возмущение, lidar, Aura satellite, stratospheric aerosol layer, ozone, sudden stratospheric warming, solar illumination, disturbance
Abstract
Lidar observations at Siberian Lidar Station (SLS) of Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences in Tomsk (56.5°N; 85.0°E) showed the presence of stratospheric aerosol layers over Tomsk during winter 2017-2018, signs of descending air masses, and deficit of ozone. Aura OMI/MLS observations indicated that in December-January 2017/2018 the total ozone (TO) content and NO2 content in the stratosphere over the Northern Eurasia, as well as the temperature in the stratosphere, were significantly lower than normal. Analysis of back trajectories and integrated (over profile) TO showed that the dynamic disturbance of the Arctic stratosphere in December 2017 led to extrusion of cold air masses with excessive reactive chlorine (in view of NO2 deficit) beyond the Arctic circle and their intrusion into the stratosphere of Tomsk. Seemingly, in the Tomsk stratosphere they were exposed to solar radiation and, staying chemically isolated, evolved into chemically disturbed state, similar to the state of springtime Arctic stratosphere, where ozone is intensely destroyed until the final warming.
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