Vertical profile variations of NO2 and O3 using slant column density observations during twilight period

An algorithm developed to derive the vertical profiles of atmospheric species from their slant column density measurements using twilight spectroscopy is discussed. The algorithm has been tested by using the slant column density measurements at the polar station at Reykjavik and the tropical station...

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Bibliographic Details
Published in:Indian journal of radio & space physics 1999-12, Vol.28 (6), p.291-301
Main Authors: Londhe, A L, Bhosale, C S, Meena, G S, Jadhav, D B, Gil, M, Puentedura, O, Yela, M
Format: Article
Language:English
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Summary:An algorithm developed to derive the vertical profiles of atmospheric species from their slant column density measurements using twilight spectroscopy is discussed. The algorithm has been tested by using the slant column density measurements at the polar station at Reykjavik and the tropical station at Pune. The vertical profiles of NO2 and O3 are retrieved by considering slant column densities for 10 different solar zenith angles and 10 different atmospheric layers of equal thickness. These vertical profiles are used to differentiate the tropospheric and stratospheric contribution of NO2 and O3. The observations of NO2 at the polar station and at the tropical station showed frequent higher values of tropospheric concentrations due to pollution episodes and are not correlated with stratospheric NO2 and O3. The correlation between total column density variations of NO2 and O3 is not observed; however, the stratospheric variations of NO2 and O3 showed good correlation. (Author)
ISSN:0367-8393