Estimation of multiyear changes in nitrogen oxide emissions in megalopolises from satellite measurements |
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Authors: | I B Konovalov |
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Institution: | 1.Institute of Applied Physics,Russian Academy of Sciences,Nizhni Novgorod,Russia |
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Abstract: | The influence that megalopolises have on the atmospheric composition on regional and global scales is the subject of intense
investigations; however, data on the emissions of pollutants used for such investigations are often insufficiently reliable.
In this work the possibilities for diagnosing long-term changes in nitrogen oxide emissions in megalopolises are investigated
based on a combined use of data from satellite measurements and modeling of the tropospheric nitrogen dioxide content. Primary
emphasis is placed on analyzing possible situations when emission changes are of a nonlinear character. The proposed methodology
includes an original method for the nonlinear approximation of changes in a physical quantity from a noised time series of
its measurements. Changes in NO
x
emissions are investigated in 12 megalopolises of Europe and the Middle East in the period from 1996 to 2008. Statistically
significant changes in NO
x
emissions are detected in five megalopolises (Baghdad, Madrid, Milan, Moscow, and Paris). By using three megalopolises (Madrid,
Milan, and Paris) as an example, it is shown that a nonlinear approximation of NO
x
emission changes agrees better with independent ground-based measurements than an analogous linear approximation. |
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Keywords: | |
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