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Proceedings Paper

Ground-based NO2 and O3 analysis at Monte Cimone station during 1995 and 1996: a case study for spring 1995 NO2 concentration profiles
Author(s): Andrea Petritoli; Giorgio Giovanelli; Paolo Bonasoni; Tiziano Colombo; Franco Evangelisti; U. Bonafe; Daniele Bortoli; Ivan K. Kostadinov; Fabrizio Ravegnani
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Paper 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.

Paper Details

Date Published: 8 December 1999
PDF: 10 pages
Proc. SPIE 3867, Satellite Remote Sensing of Clouds and the Atmosphere IV, (8 December 1999); doi: 10.1117/12.373060
Show Author Affiliations
Andrea Petritoli, Institute of Atmospheric and Oceanic Sciences (Italy)
Giorgio Giovanelli, Institute of Atmospheric and Oceanic Sciences (Italy)
Paolo Bonasoni, Institute of Atmospheric and Oceanic Sciences (Italy)
Tiziano Colombo, Italian Air Force (Italy)
Franco Evangelisti, Institute of Atmospheric and Oceanic Sciences (Italy)
U. Bonafe, Institute of Atmospheric and Oceanic Sciences (Italy)
Daniele Bortoli, Institute of Atmospheric and Oceanic Sciences (Italy)
Ivan K. Kostadinov, Institute of Atmospheric and Oceanic Sciences and STIL/Bulgarian Academy of Sciences (Italy)
Fabrizio Ravegnani, Institute of Atmospheric and Oceanic Sciences (Italy)


Published in SPIE Proceedings Vol. 3867:
Satellite Remote Sensing of Clouds and the Atmosphere IV
Jaqueline E. Russell, Editor(s)

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