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| Titel |
Estimated desert-dust ice nuclei profiles from polarization lidar: methodology and case studies |
| VerfasserIn |
R. E. Mamouri, A. Ansmann |
| 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 ; 15, no. 6 ; Nr. 15, no. 6 (2015-03-30), S.3463-3477 |
| Datensatznummer |
250119583
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| Publikation (Nr.) |
 copernicus.org/acp-15-3463-2015.pdf |
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| Zusammenfassung |
| A lidar method is presented that permits the estimation of height
profiles of ice nuclei concentrations (INC) in desert dust layers. The
polarization lidar technique is applied to separate dust and non-dust
backscatter and extinction coefficients. The desert dust extinction
coefficients σd are then converted to aerosol particle number
concentrations APC280 which consider particles with radius
> 280 nm only. By using profiles of APC280 and ambient
temperature T along the laser beam, the profile of INC can be estimated
within a factor of 3 by means of APC-T-INC parameterizations from the
literature. The observed close relationship between σd at 500 nm
and APC280 is of key importance for a successful INC retrieval. We
studied this link by means of AERONET (Aerosol Robotic Network) sun/sky
photometer observations at Morocco, Cabo Verde, Barbados, and Cyprus during
desert dust outbreaks. The new INC retrieval method is applied to lidar
observations of dust layers with the spaceborne lidar CALIOP (Cloud Aerosol
Lidar with Orthogonal Polarization) during two overpasses over the EARLINET
(European Aerosol Research Lidar Network) lidar site of the Cyprus University
of Technology (CUT), Limassol (34.7° N, 33° E), Cyprus. The
good agreement between the CALIOP and CUT lidar retrievals of σd, APC280,
and INC profiles corroborates the potential of CALIOP to
provide 3-D global desert dust APC280 and INC data sets. |
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