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Kozlov V.I.,Russian Academy of Sciences | Mullayarov V.A.,Russian Academy of Sciences | Grigorev Y.M.,Amosov Northeastern Federal University | Tarabukina L.D.,Russian Academy of Sciences
Izvestiya - Atmospheric and Ocean Physics | Year: 2014

The results of integrated instrumental observations of thunderstorm activity around Yakutsk at a radius of 400 and 30 km are presented. The seasonal course of thunderstorm activity was found to contain characteristic peaks in the first 10 days of June and the last 10 days of July or early August. The fraction of cloud-to-ground discharges in Central Yakutia is 40-60%, which is consistent with observations in Western Siberia (40-50%). The number of positive discharges to the ground was 8-15% of all cases of discharges to the ground, which is consistent with observations in Germany (17%) and slightly exceeds the observed number in the Caucasus (2.2-8.2%) and United States (4.5%). The thunderstorm activity in Yakutsk is three times higher than in the area around Yakutsk with a radius of 400 km, which can be explained by the fact that the city is a heat island. © 2014 Pleiades Publishing, Ltd. Source

Orekhov D.I.,Peoples Friendship University of Russia | Yakovleva O.V.,Moscow State University | Goryachev S.N.,Moscow State University | Protopopov F.F.,Moscow State University | Alekseev A.A.,Amosov Northeastern Federal University
Biophysics (Russian Federation) | Year: 2015

The physiological state of the leaves of the small-leaved linden (Tilia cordata), silver birch (Betula pendula), and northern white cedar (Thuja occidentalis) under urban conditions was assessed via recording the kinetics of chlorophyll under fluorescence induction. Different sensitivities of the plants to adverse growing conditions were revealed. The most sensitive parameters of the fluorescence JIP test, viz., PIABS, FV/F0, and FV/FM, were identified as indicators of the physiological state of the urban phytocoenosis. Recommendations for the application of the method for monitoring studies are presented. © 2015, Pleiades Publishing, Inc. Source

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