Development of a new methodology for the retrieval of in-situ stratospheric trace gases concentration from airborne limb-absorption measurements

Andrea Petritoli; Giorgio Giovanelli; Fabrizio Ravegnani; Daniele Bortoli; Ivan K. Kostadinov; Elisa Castelli; U. Bonafe; A. Oulanovsky; Vladimir Yushkov

doi:10.1117/12.454285

30 January 2002 Development of a new methodology for the retrieval of in-situ stratospheric trace gases concentration from airborne limb-absorption measurements

Andrea Petritoli, Giorgio Giovanelli, Fabrizio Ravegnani, Daniele Bortoli, Ivan K. Kostadinov, Elisa Castelli, U. Bonafe, A. Oulanovsky, Vladimir Yushkov

Author Affiliations +

Proceedings Volume 4485, Optical Spectroscopic Techniques, Remote Sensing, and Instrumentation for Atmospheric and Space Research IV; (2002) https://doi.org/10.1117/12.454285
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

The UV-Vis DOAS spectrometer GASCOD/A4p (Gas Analyzer Spectrometer Correlating Optical Differences, Airborne version) was installed on board the stratospheric Geophysica aircraft during the APE-THESEO and APE-GAIA campaign in February-March and September-October 1999 respectively. The instrument is provided by five input windows, three of which measure scattered solar radiation from the zenith and from two horizontal windows, 90 degree(s) away from the zenith to perform limb-absorption measurements. Spectra from 290 to 700 nm were processed through DOAS technique to obtain trace gases column amounts. Data from horizontal windows, which are performed for the first time from an airborne spectrometer, are used to retrieve an average concentration of the gases along a characteristic length of the line of sight. An atmospheric Air Mass Factor model (AMEFCO) is used to calculate the probability density function and the characteristic length used to reduce the slant column amounts to in-situ concentration values. The validation of the method is performed through a comparison of the values obtained, with a in-situ chemiluminescent ozone analyzer (FOZAN) which performed synchronous measurements on board Geophysica aircraft. Data from the APE-GAIA campaign was presented and discussed.

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Andrea Petritoli, Giorgio Giovanelli, Fabrizio Ravegnani, Daniele Bortoli, Ivan K. Kostadinov, Elisa Castelli, U. Bonafe, A. Oulanovsky, and Vladimir Yushkov "Development of a new methodology for the retrieval of in-situ stratospheric trace gases concentration from airborne limb-absorption measurements", Proc. SPIE 4485, Optical Spectroscopic Techniques, Remote Sensing, and Instrumentation for Atmospheric and Space Research IV, (30 January 2002); https://doi.org/10.1117/12.454285

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KEYWORDS

Ozone

Atmospheric modeling

Gases

Spectroscopy

Atmospheric optics

Atmospheric sensing

Monochromators

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