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| Titel |
Retrieval of aerosol optical depth in vicinity of broken clouds from reflectance ratios: case study |
| VerfasserIn |
E. Kassianov, M. Ovchinnikov, L. K. Berg, S. A. McFarlane, C. Flynn, R. Ferrare, C. Hostetler, M. Alexandrov |
| 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 ; 3, no. 5 ; Nr. 3, no. 5 (2010-10-06), S.1333-1349 |
| Datensatznummer |
250001295
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| Publikation (Nr.) |
 copernicus.org/amt-3-1333-2010.pdf |
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| Zusammenfassung |
| A recently developed reflectance ratio (RR) method for the retrieval of
aerosol optical depth (AOD) is evaluated using extensive airborne and
ground-based data sets collected during the Cloud and Land Surface
Interaction Campaign (CLASIC) and the Cumulus Humilis Aerosol Processing
Study (CHAPS), which took place in June 2007 over the US Department of
Energy (DOE) Atmospheric Radiation Measurement (ARM) Southern Great Plains
site. A detailed case study is performed for a field of single-layer shallow
cumuli observed on 12 June 2007. The RR method is applied to retrieve the
spectral values of AOD from the reflectance ratios measured by the MODIS
Airborne Simulator (MAS) for two pairs of wavelengths (660 and 470 nm, 870
and 470 nm) collected at a spatial resolution of 0.05 km. The retrieval is
compared with an independent AOD estimate from three ground-based
Multi-filter Rotating Shadowband Radiometers (MFRSRs). The interpolation
algorithm that is used to project MFRSR point measurements onto the aircraft
flight tracks is tested using AOD derived from NASA Langley High Spectral
Resolution Lidar (HSRL). The RR AOD estimates are in a good agreement
(within 5%) with the MFRSR-derived AOD values for the 660-nm wavelength.
The AODs obtained from MAS reflectance ratios overestimate those derived
from MFRSR measurements by 15–30% for the 470-nm wavelength and
underestimate the 870-nm AOD by the same amount. |
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