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| Titel |
Observation of Vertical Column Density of NO_2 and SO_2 by A New Mobile Two optical paths Differential Optical Absorption Spectroscopy Technique |
| VerfasserIn |
Zhaokun Hu, Ang Li, Pinhua Xie, Fengcheng Wu, Jin Xu |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250152583
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| Publikation (Nr.) |
 EGU/EGU2017-17436.pdf |
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| Zusammenfassung |
| The mobile differential optical absorption spectroscopy(DOAS) instrument collected the zenith scattered light in the UV or visible region and it was used to derive the vertical column density of trace gases above the measurement route. However, the slant column density is retrieved instead of vertical column density recently, which results in emission flux computing error. A new mobile multi light DOAS system was deployed, which set two angle telescopes(90°, 30°) to receive the scattered light respectively ,and set two shutters to switch the optical path quickly in the mobile platform. The slant column density in two different viewing directions were detected, and combined with the geometric approximation, the vertical column density of trace gas was obtained. The new system had high sensitivity and low uncertainty. A test experiment was performed in Huairou, Beijing using the new system. The distribution information of NO2 and SO2 vertical column density along the route was derived. |
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