The weekly cycle of pollutant concentrations in the surface air above Moscow
N.F. Elansky1, A.V. Shilkin2, E.G. Semutnikova3, P.V. Zaharova4, V.S. Rakitin1, N.A. Ponomarev1, Y.M. Verevkin1
1A.M. Obukhov Institute of Atmospheric Physics Russian Academy of Sciences, Pyzhevsky per., 3, 119017, Moscow, Russia
2Russian Federal Service on Hydrometeorology and Environmental Monitoring Research and Production Association В«Typhoon», 4, Pobeda str., Obninsk, Kaluga Region, 249038 Russia
3Department of Nature Management and Environmental Protection of Moscow, 11/1, Novyj Arbat, 1119019, Moscow, Russia
4Mosjekomonitoring, 11/1, Novyj Arbat, 1119019, Moscow, Russia
Keywords: недельный цикл, загрязняющие примеси, окись углерода, метан, окись азота, двуокись азота, двуокись серы, аэрозоль, приземные концентрации, мегаполис, weekly cycle, pollutants, carbon monoxide, methane, nitrogen oxide, nitrogen dioxide, sulfur dioxide, aerosol, surface concentrations, megacity
Abstract
The temporal variability of the concentrations of air pollutants CO, NO, NO2, SO2 and PM10 in the surface air layer above Moscow shows a weekly cycle, which is manifested in a decrease in the pollution level on weekends. To determine the main feature of the weekly variations and the amplitude of the weekly cycle, a 10-year archive of data on atmospheric composition from 46 “Mosecomonitoring” stations was used for change first time. The city and season average amplitudes of weekly variations in the daytime concentrations of CO vary from 21.8% in spring to 29.2% in winter, and of NO, from 16.9% in summer to 38.1% in winter. The weekly cycle of NO2 daily concentration is stable during the year, and its amplitude is 33% on average. Amplitudes of weekly variations in SO2 and PM10 are maximal in daytime data and equal to 22.7% and 35.2%, respectively, in autumn; the CH4 weekly cycle is insignificant. A weekly cycle in night concentrations of these pollutants is significant only for NO2. The analysis of the data obtained for different Moscow districts shows approximately the same Sunday effect. Only CO concentrations have increased amplitudes in the city centre (39.2%) and southwestern sector (35.1%).
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