Variations in nitrogen dioxide in the atmosphere over central Eurasia (Issyk Kul Monitoring Station) |
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| Authors: | V N Aref’ev F V Kashin V K Semenov V P Sinyakov |
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| Institution: | 1. NPO Typhoon, ul. Pobedy 4, Obninsk, Kaluga oblast, 249038, Russia
2. Kyrgyz State National University, ul. Manasa 101, Bishkek, 720033, Kyrgyzstan
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| Abstract: | The results of an analysis of data on the total content of nitrogen dioxide in a vertical atmospheric column are given. These data have been obtained from measurements with the twilight method over a period of 25 years. The monthly and annual means (the arithmetic means of both morning and evening values) of NO2, on the whole, have increased by ～6% in spite of its rapid decrease in 1991–1995 due to the Pinatubo eruption. The linear-trend index amounts to 0.23% per year. The annual mean over the entire observation time is equal to (3.18 ± 0.05) × 1015 mol/cm2, and the amplitude of seasonal variations amounts to (2.39 ± 0.04) × 1015 mol/cm2. Spectral analysis of the experimental data has revealed compound oscillations with periods of 6 to 253 months, the values of which do not contradict published data. Most of these oscillations are nonharmonic. A simple statistical model satisfactorily describes time variations in the monthly and annual means of NO2 with rms deviations of ～4% and 1%, respectively. |
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