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| Titel |
Characterization and verification of ACAM slit functions for trace-gas retrievals during the 2011 DISCOVER-AQ flight campaign |
| VerfasserIn |
C. Liu, X. Liu, M. G. Kowalewski, S. J. Janz, G. González Abad, K. E. Pickering, K. Chance, L. N. Lamsal |
| 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 ; 8, no. 2 ; Nr. 8, no. 2 (2015-02-13), S.751-759 |
| Datensatznummer |
250116133
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| Publikation (Nr.) |
 copernicus.org/amt-8-751-2015.pdf |
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| Zusammenfassung |
| The Airborne Compact Atmospheric Mapper (ACAM), an
ultraviolet/visible/near-infrared spectrometer, has been flown on board the
NASA UC-12 aircraft during the Deriving Information on Surface
Conditions from Column and Vertically Resolved Observations Relevant to Air
Quality (DISCOVER-AQ) campaigns to provide remote sensing observations of tropospheric
and boundary-layer pollutants from its radiance measurements. To assure the
trace-gas retrieval from ACAM measurements we perform detailed
characterization and verification of ACAM slit functions. The wavelengths
and slit functions of ACAM measurements are characterized for the air-quality channel (~304–500 nm) through cross-correlation with
a high-resolution solar irradiance reference spectrum after necessarily
accounting for atmospheric gas absorption and the ring effect in the
calibration process. The derived slit functions, assuming a hybrid
combination of asymmetric Gaussian and top-hat slit functions, agree very
well with the laboratory-measured slit functions. Comparisons of trace-gas
retrievals between using derived and measured slit functions demonstrate
that the cross-correlation technique can be reliably used to characterize
slit functions for trace-gas retrievals. |
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