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Abstract

The focus of this study is on the quantification of NOx emissions. We characterized and quantfified vertically integrated NO2 concentrations (VCDs) and NOx emissions by using mobile MAX-DOAS and satellite observations. The mobile MAX-DOAS observations are conducted on different circles around megacities. From the combination of MAX-DOAS observations with meteorological data, total NOx emissions from different megacities were estimated. In this thesis, several correction methods were developed, which allowed for the first time the quantitative determination of NOx emissions from mobile MAX-DOAS observations. OMI satellite observations were also used for estimation of NOx emissions, and were found to be very similar to the obtained emissions from MAX-DOAS in summer. Also VCDs from mobile MAX-DOAS and OMI were compared. Good agreement was found for summer, but worse agreement for winter. The obtained emissions from mobile MAX-DOAS are season-dependent with 145% higher in winter. We also compared the NO2 VCDs and NOx emissions with CHIMERE model results and input emissions. Good agreement was found for summer, but in winter the NO2 VCDs and NOx emissions derived from MAXDOAS are about 35% and 45% higher than from CHIMERE respectively.