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| Titel |
NO2 tropospheric profiles with spatially scanning DOAS spectrometer |
| VerfasserIn |
Samuele Masieri, Giorgio Giovanelli, Andrea Petritoli, Ivan Kostadinov, Margherita Premuda, Daniele Bortoli, Fabrizio Ravegnani |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250041356
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| Zusammenfassung |
| A simple algorithm, developed at ISAC Institute, to retrieve gas concentration’s profiles by means of Tropospheric Gas Analyser Spectrometer (TropoGAS), adopting Off-Axis DOAS methodology is presented. Combining previously selected measurements obtained at different line of sight, we calculate the concentration along the first 2 km of troposphere. The first step is aimed to evaluate in the same spectral region (from 430nm to 495nm) by means of our DOAS processor the slant columns of NO2 and O4, and to separate the tropospheric part from the total one. Measurements are performed in the subsequent angles of sight: a=1,2,4,8,16,32° above the horizon and one measurement is taken along the sun direction. The second step consists of the use of measured O4 slant column to evaluate the correct optical path needed to calculate NO2 concentration form measured NO2 tropospheric slant column. Profiles of NO2 and other gases absorbing in this spectral range (such as CHOCHO) are shown and compared with the ground value obtained from ARPA in-situ analyser network. Finally we discuss the applicability of this technique in urban air quality monitoring and future possible improvements of the method. |
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