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Titel Comparison of Tropospheric NO2 Columns from the LOTOS-EUROS Regional Air Quality Model and Ground Based MAX-DOAS Observations
VerfasserIn Tim Vlemmix, Henk Eskes, Ankie Piters, Pieternel Levelt
Konferenz EGU General Assembly 2011
Medientyp Artikel
Sprache Englisch
Digitales Dokument PDF
Erschienen In: GRA - Volume 13 (2011)
Datensatznummer 250050831
 
Zusammenfassung
It has been demonstrated that the MAX-DOAS measurement technique can be used to retrieve tropospheric NO2 columns from ground based observations of scattered sunlight with an uncertainty below 20% (cloud free conditions). We have used a twelve-month data set (mostly 2008) of MAX-DOAS observations done in De Bilt, the Netherlands, to compare tropospheric NO2 columns - seasonal variation, diurnal cycle, weekly cycle - with the regional air quality model LOTOS-EUROS that was run on a high-resolution grid (7x7 km2). A comparison with both a free model run, and a run including assimilated surface observations of NOx and ozone, was performed to study the effect of data-assimilation. For cloudy conditions, only the sub-cloud tropospheric NO2 columns were compared, using lidar cloud height observations in combination with the NO2 profile from the LOTOS-EUROS model.