Ground-based NO2 and O3 analysis at Monte Cimone station during 1995 and 1996: a case study for spring 1995 NO2 concentration profiles

Andrea Petritoli; Giorgio Giovanelli; Paolo Bonasoni; Tiziano Colombo; Franco Evangelisti; U. Bonafe; Daniele Bortoli; Ivan K. Kostadinov; Fabrizio Ravegnani

doi:10.1117/12.373060

8 December 1999 Ground-based NO₂ and O₃ analysis at Monte Cimone station during 1995 and 1996: a case study for spring 1995 NO₂ concentration profiles

Andrea Petritoli, Giorgio Giovanelli, Paolo Bonasoni, Tiziano Colombo, Franco Evangelisti, U. Bonafe, Daniele Bortoli, Ivan K. Kostadinov, Fabrizio Ravegnani

Author Affiliations +

Proceedings Volume 3867, Satellite Remote Sensing of Clouds and the Atmosphere IV; (1999) https://doi.org/10.1117/12.373060
Event: Remote Sensing, 1999, Florence, Italy

Abstract

A UV/Vis DOAS spectrometer (GASCOD, Gas Analyzer Spectrometer Correlating Optical Differences) was installed at Monte Cimone station in 1993 and since then it has been measuring zenith scattered solar radiation at sunset and sunrise. During 1995 it was possible to investigate two spectral regions, about 50 nm width, centered at 365 nm and 436 nm while later we only have measurements at 436 nm available. The spectra obtained during the 1995 - 96 period have been processed with DOAS technique to obtain column amounts of NO₂ and O₃. The seasonal and diurnal variation of the NO₂ column amounts is shown with a summer maximum (about 1.2 X 10¹⁷ mol(DOT)cm^-2 for p.m. value and 6 X 10¹⁶ mol(DOT)cm^-2 for a.m.) and winter minimum (about 2 X 10¹⁶ mol(DOT)cm^-2 for a.m. and 5 X 10¹⁶ mol(DOT)cm^-2 for p.m.). An anomalous spring increase in p.m. NO₂ value during 1995 is investigated through a vertical distribution analysis. The gas profile is retrieved through a Chahine inversion algorithm applied to the slant columns measured at different solar zenith angle. In fact the air mass factor variation with solar zenith angle can be used to extract information about the gas concentration at each atmospheric layers. A consistent and frequent tropospheric increase in NO₂ a.m. concentration is evident. The method and the results obtained are discussed.

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Andrea Petritoli, Giorgio Giovanelli, Paolo Bonasoni, Tiziano Colombo, Franco Evangelisti, U. Bonafe, Daniele Bortoli, Ivan K. Kostadinov, and Fabrizio Ravegnani "Ground-based NO₂ and O₃ analysis at Monte Cimone station during 1995 and 1996: a case study for spring 1995 NO₂ concentration profiles", Proc. SPIE 3867, Satellite Remote Sensing of Clouds and the Atmosphere IV, (8 December 1999); https://doi.org/10.1117/12.373060

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