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| Titel |
CALIOP near-real-time backscatter products compared to EARLINET data |
| VerfasserIn |
T. Grigas, M. Hervo, G. Gimmestad, H. Forrister, P. Schneider, J. Preißler, L. Tarrasón, C. O'Dowd |
| 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. 21 ; Nr. 15, no. 21 (2015-11-03), S.12179-12191 |
| Datensatznummer |
250120137
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| Publikation (Nr.) |
 copernicus.org/acp-15-12179-2015.pdf |
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| Zusammenfassung |
| The expedited
near-real-time Level 1.5 Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) version 3 products were
evaluated against data from the ground-based European Aerosol Research Lidar
Network (EARLINET). The statistical framework and results of the three-year
evaluation of 48 CALIOP overpasses with ground tracks within a 100 km
distance from operating EARLINET stations are presented and include analysis
for the following CALIOP classifications of aerosol type: dust, polluted
dust, clean marine, clean continental, polluted continental, mixed and/or
smoke/biomass burning. For the complete data set comprising both the
planetary boundary layer (PBL) and the free troposphere (FT) data, the
correlation coefficient (R) was 0.86. When the analysis was conducted
separately for the PBL and FT, the correlation coefficients were R = 0.6 and
R = 0.85, respectively. From analysis of selected specific cases, it was
initially thought that the presence of FT layers, with high attenuated
backscatter, led to poor agreement of the PBL backscatter profiles between
the CALIOP and EARLINET and prompted a further analysis to filter out such
cases; however, removal of these layers did not improve the agreement as R
reduced marginally from R = 0.86 to R = 0.84 for the combined PBL and FT
analysis, increased marginally from R = 0.6 up to R = 0.65 for the PBL on its
own, and decreased marginally from R = 0.85 to R = 0.79 for the FT analysis on
its own. This suggests considerable variability, across the data set, in the
spatial distribution of the aerosol over spatial scales of 100 km or less
around some EARLINET stations rather than influence from elevated FT layers.
For specific aerosol types, the correlation coefficient between CALIOP
backscatter profiles and the EARLINET data ranged from R = 0.37 for polluted
continental aerosol in the PBL to R = 0.57 for dust in the FT. |
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