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| Titel |
Sources of discrepancy between aerosol optical depth obtained from AERONET and in-situ aircraft profiles |
| VerfasserIn |
A. R. Esteve, J. A. Ogren, P. J. Sheridan, E. Andrews, B. N. Holben, M. P. Utrillas |
| 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 ; 12, no. 6 ; Nr. 12, no. 6 (2012-03-27), S.2987-3003 |
| Datensatznummer |
250010947
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| Publikation (Nr.) |
 copernicus.org/acp-12-2987-2012.pdf |
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| Zusammenfassung |
| Aerosol optical properties were measured by NOAA's Airborne Aerosol
Observatory over Bondville, Illinois, during more than two years using a
light aircraft. Measured properties included total light scattering,
backscattering, and absorption, while calculated parameters included aerosol
optical depth (AOD), Ångström exponent, single-scattering albedo,
hemispheric backscatter fraction, asymmetry parameter, and submicrometer
mode fraction of scattering. The in-situ aircraft measurements are compared
here with AERONET measurements and retrievals of the aerosol optical
properties at the same location, although it is difficult to verify the
AERONET retrieval algorithm at a site that is not highly polluted. The
comparison reveals discrepancies between the aerosol properties retrieved
from AERONET and from in-situ aircraft measurements. These discrepancies are
smaller for the AOD, while the biggest discrepancies are for the other
derived aerosol properties. Possible sources of discrepancy between the AOD
measured by AERONET and the one calculated from the in-situ aircraft
measurements are investigated. The largest portion of the AOD discrepancy is
likely due to an incorrect adjustment to ambient RH of the scattering
coefficient. Another significant part (along with uncertain nephelometer
truncation corrections) may come from the possibility that there might be
less aerosol below the lowest flight altitude or that the aircraft inlet
excludes aerosol particles larger than 5–7 μm diameter. |
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