Tropospheric profile of NO2 over the Po Valley measured with scan DOAS spectrometer

S. Masieri; D. Bortoli; A. Petritoli; I. Kostadinov; M. Premuda; F. Ravegnani; C. Carnevale; E. Pisoni; M. Volta; G. Giovanelli

doi:10.1117/12.830413

7 October 2009 Tropospheric profile of NO₂ over the Po Valley measured with scan DOAS spectrometer

S. Masieri, D. Bortoli, A. Petritoli, I. Kostadinov, M. Premuda, F. Ravegnani, C. Carnevale, E. Pisoni, M. Volta, G. Giovanelli

Author Affiliations +

Proceedings Volume 7478, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology IX; 74782I (2009) https://doi.org/10.1117/12.830413
Event: SPIE Remote Sensing, 2009, Berlin, Germany

Abstract

A simple method to determine the vertical distribution of a pollutant gas, namely NO₂, by means of the spectral measurements obtained with a scan-DOAS spectrometer, is presented. The developed technique can be summarized as follows: i) a series of quasi simultaneous measurements in the zenith and in others directions allowing for the determination of the Slant Column Density of NO₂ for different elevation angles; ii) an active DOAS measurement for the determination of the NO₂ concentration at the ground; iii) a set of Radiative Transfer Model (RTM) calculation of the scattering distance from the spectrometer, for a set of visibility values; iv) a recursive procedure of profile calculation starting from the first measurement and subtracting the value of NO2 Slant Column Density (SCD) retrieved from the measurement taken at the previous angle of sight. Measurements are carried out during summer 2007 in S. Pietro Capofiume (Bologna-Italy). The vertical distribution for NO₂ obtained with the above described method has been compared with the profiles calculated with the GAMES (Gas Aerosol Modelling Evaluation System) model. The results of this comparison show some differences between the modelled and the measured profiles, probably due to box approximations in RTM calculation for measured profiles and to the large pixel grid (about 10x10 km2), for model evaluation.

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S. Masieri, D. Bortoli, A. Petritoli, I. Kostadinov, M. Premuda, F. Ravegnani, C. Carnevale, E. Pisoni, M. Volta, and G. Giovanelli "Tropospheric profile of NO₂ over the Po Valley measured with scan DOAS spectrometer", Proc. SPIE 7478, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology IX, 74782I (7 October 2009); https://doi.org/10.1117/12.830413

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