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| Titel |
Assessment of the CALIPSO Lidar 532 nm attenuated backscatter calibration using the NASA LaRC airborne High Spectral Resolution Lidar |
| VerfasserIn |
R. R. Rogers, C. A. Hostetler, J. W. Hair, R. A. Ferrare, Z. Liu, M. D. Obland, D. B. Harper, A. L. Cook, K. A. Powell, M. A. Vaughan, D. M. Winker |
| 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 ; 11, no. 3 ; Nr. 11, no. 3 (2011-02-15), S.1295-1311 |
| Datensatznummer |
250009308
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| Publikation (Nr.) |
 copernicus.org/acp-11-1295-2011.pdf |
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| Zusammenfassung |
| The Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) instrument on
the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
(CALIPSO) spacecraft has provided global, high-resolution vertical profiles
of aerosols and clouds since it became operational on 13 June 2006. On 14
June 2006, the NASA Langley Research Center (LaRC) High Spectral Resolution
Lidar (HSRL) was deployed aboard the NASA Langley B-200 aircraft for the
first of a series of 86 underflights of the CALIPSO satellite to provide
validation measurements for the CALIOP data products. To better assess the
range of conditions under which CALIOP data products are produced, these
validation flights were conducted under both daytime and nighttime lighting
conditions, in multiple seasons, and over a large range of latitudes and
aerosol and cloud conditions. This paper presents a quantitative assessment
of the CALIOP 532 nm calibration (through the 532 nm total attenuated
backscatter) using internally calibrated airborne HSRL underflight data and
is the most extensive study of CALIOP 532 nm calibration. Results show that
HSRL and CALIOP 532 nm total attenuated backscatter agree on average within
2.7% ± 2.1% (CALIOP lower) at night and within 2.9% ± 3.9% (CALIOP lower) during the day, demonstrating the accuracy of the
CALIOP 532 nm calibration algorithms. Additionally, comparisons with HSRL
show consistency of the CALIOP calibration before and after the laser switch
in 2009 as well as improvements in the daytime version 3.01 calibration
scheme compared with the version 2 calibration scheme. Potential biases and
uncertainties in the methodology relevant to validating satellite lidar
measurements with an airborne lidar system are discussed and found to be
less than 4.5% ± 3.2% for this validation effort with HSRL.
Results from this study are also compared with prior assessments of the
CALIOP 532 nm attenuated backscatter calibration. |
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