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| Titel |
Validation of CALIPSO space-borne-derived attenuated backscatter coefficient profiles using a ground-based lidar in Athens, Greece |
| VerfasserIn |
R. E. Mamouri, V. Amiridis, A. Papayannis, E. Giannakaki, G. Tsaknakis, D. S. Balis |
| 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 ; 2, no. 2 ; Nr. 2, no. 2 (2009-09-14), S.513-522 |
| Datensatznummer |
250000565
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| Publikation (Nr.) |
 copernicus.org/amt-2-513-2009.pdf |
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| Zusammenfassung |
| We present initial aerosol validation results of the space-borne lidar
CALIOP -onboard the CALIPSO satellite- Level 1 attenuated backscatter
coefficient profiles, using coincident observations performed with a
ground-based lidar in Athens, Greece (37.9° N, 23.6° E). A
multi-wavelength ground-based backscatter/Raman lidar system is operating
since 2000 at the National Technical University of Athens (NTUA) in the
framework of the European Aerosol Research LIdar NETwork (EARLINET), the
first lidar network for tropospheric aerosol studies on a continental scale.
Since July 2006, a total of 40 coincidental aerosol ground-based lidar
measurements were performed over Athens during CALIPSO overpasses. The
ground-based measurements were performed each time CALIPSO overpasses the
station location within a maximum distance of 100 km. The duration of the
ground–based lidar measurements was approximately two hours, centred on the
satellite overpass time. From the analysis of the ground-based/satellite
correlative lidar measurements, a mean bias of the order of 22% for
daytime measurements and of 8% for nighttime measurements with respect
to the CALIPSO profiles was found for altitudes between 3 and 10 km. The
mean bias becomes much larger for altitudes lower that 3 km (of the order of
60%) which is attributed to the increase of aerosol horizontal
inhomogeneity within the Planetary Boundary Layer, resulting to the
observation of possibly different air masses by the two instruments. In
cases of aerosol layers underlying Cirrus clouds, comparison results for
aerosol tropospheric profiles become worse. This is attributed to the
significant multiple scattering effects in Cirrus clouds experienced by
CALIPSO which result in an attenuation which is less than that measured by
the ground-based lidar. |
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