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| Titel |
Aerosol profiling with the Jenoptik ceilometer CHM15kx |
| VerfasserIn |
M. Wiegner, A. Geiß |
| 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 ; 5, no. 8 ; Nr. 5, no. 8 (2012-08-13), S.1953-1964 |
| Datensatznummer |
250003049
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| Publikation (Nr.) |
 copernicus.org/amt-5-1953-2012.pdf |
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| Zusammenfassung |
| Since a few years, the number of active remote sensing systems has been rapidly
increasing as national weather services started to build up networks of
ceilometers. As ceilometers can be considered as "simple" backscatter
lidars, it is obvious to investigate to which extent they can provide quantitative
aerosol information. In this context, the calibration of the ceilometer is the
most crucial point: whereas previous studies primarily have relied on the
comparisons with co-incident sun photometer measurements and the Rayleigh
calibration, we provide an absolute calibration of the ceilometer. The
advantage of this approach is that backscatter profiles can be derived during
daytime and nighttime, and even in cases when the signal-to-noise ratio of
signals from the free troposphere is very low. Moreover, the retrieval can
easily be automated. In this paper, we consider the Jenoptik
CHM15kx-ceilometer. We discuss the methodology and the achievable accuracy
and present a set of examples to highlight the wide range of applications,
and the limitations. The achievable temporal resolution is of the order of a
few minutes; the relative error of the particle backscatter coefficient is
less than 10%. It is emphasized that the accuracy of extinction coefficients
and – as a consequence – of the aerosol optical depth is limited due to the
unknown lidar ratio. This is, however, an inherent problem of any backscatter
lidar and not a special feature of the ceilometer. |
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