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| Titel |
Dust optical properties over North Africa and Arabian Peninsula derived from the AERONET dataset |
| VerfasserIn |
D. Kim, M. Chin, H. Yu, T. F. Eck, A. Sinyuk, A. Smirnov, B. N. Holben |
| 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. 20 ; Nr. 11, no. 20 (2011-10-28), S.10733-10741 |
| Datensatznummer |
250010155
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| Publikation (Nr.) |
 copernicus.org/acp-11-10733-2011.pdf |
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| Zusammenfassung |
| Dust optical properties over North Africa and the Arabian Peninsula are
extracted from the quality assured multi-year datasets obtained at 14 sites
of the Aerosol Robotic Network (AERONET). We select the data with (a) large
aerosol optical depth (AOD ≥ 0.4 at 440 nm) and (b) small
Ångström exponent (Åext ≤ 0.2) for retaining high
accuracy and reducing interference of non-dust aerosols. The result
indicates that the major fraction of high aerosol optical depth days are
dominated by dust over these sites even though it varies depending on
location and time. We have found that the annual mean and standard deviation
of single scattering albedo, asymmetry parameter, real refractive index, and
imaginary refractive index for Saharan and Arabian desert dust is 0.944 ± 0.005,
0.752 ± 0.014, 1.498 ± 0.032, and 0.0024 ± 0.0034 at 550 nm
wavelength, respectively. Dust aerosol selected by this method is less
absorbing than the previously reported values over these sites. The weaker
absorption of dust from this study is consistent with the studies using
remote sensing techniques from satellite. These results can help to
constrain uncertainties in estimating global dust shortwave radiative
forcing. |
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