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| Titel |
Nadir airborne lidar observations of deep aerosol layers |
| VerfasserIn |
F. Marenco |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 8 ; Nr. 6, no. 8 (2013-08-15), S.2055-2064 |
| Datensatznummer |
250085038
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| Publikation (Nr.) |
 copernicus.org/amt-6-2055-2013.pdf |
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| Zusammenfassung |
| The observation of deep and optically thick aerosol layers by a
nadir-pointing lidar poses a challenge in terms of the signal inversion into
a geophysically meaningful quantity such as extinction coefficient. A far-end
reference molecular layer will usually be unavailable if the observed layer
is near the surface, and using a near-end reference results in an unstable
mathematical solution. In this paper, it is demonstrated that a far-end
reference, taken within the aerosol layer, yields a better solution, and that
the influence of the reference reduces strongly when coming inward, so that
1–2 km above reference the solution can be trusted. A method is developed
to set the reference using the assumption of a well-mixed layer near the
surface, and its effect is tested on data collected during recent
aircraft-based campaigns. The method is also tested on simulated profiles in
order to verify its limits and accuracy. The assumption of a well-mixed layer
can be relaxed if one is able to set the reference well within a layer rather
than at its boundaries. |
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