Data on the NO 2 content in the vertical column of the atmosphere obtained with the Ozone Monitoring Instrument (OMI) aboard the EOS Aura satellite (United States) in the period from October 2004 to October 2007 are compared with the results of ground-based measurements at the Zvenigorod Scientific Station (55.7° N, 36.8° E). The “unpolluted”; part of the total NO 2 content in the atmospheric column, which mostly represents the stratosphere, and the NO 2 contents in the vertical column of the troposphere, including the lower layer, which is subject to pollution, are included in the comparison. The correlation coefficient between the results of ground-based and satellite measurements of the “unpolluted” total NO 2 content is ∼0.9. The content values measured with the OMI instrument are smaller than the results of ground-based measurements (on average, by (0.30 ± 0.03) × 10 15 cm −2 or by (11 ± 1)%). Therms discrepancy between the satellite and ground-based data is 0.6 × 10 15 cm −2 . The NO 2 content in the vertical column of the troposphere from the results of satellite measurements is, on average, (1.4 ± 0.5) × 10 15 cm −2 , (or about 35%) smaller than from the results of ground-based measurements, and the rms discrepancy between them is about 200%. The correlation coefficient between these data is ∼0.4. This considerable discrepancy is evidently caused by the strong spatial (horizontal) inhomogeneity and the temporal variability of the NO 2 field during episodes of pollution, which leads to different (and often uncorrelated) estimates of the NO 2 content in the lower troposphere due to different spatial resolutions of ground-based and satellite measurements.
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Груздев et al. (2009) studied this question.
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