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| Titel |
On retrieval of lidar extinction profiles using Two-Stream and Raman techniques |
| VerfasserIn |
I. S. Stachlewska, C. Ritter |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 6 ; Nr. 10, no. 6 (2010-03-25), S.2813-2824 |
| Datensatznummer |
250008258
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| Publikation (Nr.) |
 copernicus.org/acp-10-2813-2010.pdf |
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| Zusammenfassung |
| The Two-Stream technique employs simultaneous measurements
performed by two elastic backscatter lidars pointing at each
other to sample into the same atmosphere. It allows for
a direct retrieval of the extinction coefficient profile from
the ratio of the two involved lidar signals. During a number of
Alfred-Wegener-Institute (AWI) campaigns dedicated to
Arctic research, the AWI's Polar 2 aircraft with the
integrated onboard nadir-pointing Airborne Mobile Aerosol Lidar
(AMALi) was utilised. The aircraft flew over a vicinity of Ny Ålesund on Svalbard,
where the zenith-pointing Koldewey Aerosol Raman Lidar (KARL)
has been located. This experimental approach gave the unique
opportunity to retrieve the extinction profiles with a rarely
used Two-Stream technique against a well established
Raman technique. Both methods were applied to data obtained
for clean Arctic conditions during the Arctic Study of
Tropospheric clouds and Radiation (ASTAR 2004) campaign, and
slightly polluted Arctic conditions during the Svalbard
Experiment (SvalEx 2005) campaign. Successful comparison
of both evaluation tools in different measurement conditions
demonstrates sensitivity and feasibility of the Two-Stream
method to obtain particle extinction and backscatter
coefficients profiles without assumption of their relationship
(lidar ratio). The method has the potential to serve as an
extinction retrieval tool for KARL or AMALi simultaneous
observations with the space borne CALIPSO lidar overpasses during
the ASTAR 2007. |
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