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| Titel |
A new method of measuring aerosol optical properties from digital twilight photographs |
| VerfasserIn |
M. Saito, H. Iwabuchi |
| 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. 10 ; Nr. 8, no. 10 (2015-10-14), S.4295-4311 |
| Datensatznummer |
250116639
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| Publikation (Nr.) |
 copernicus.org/amt-8-4295-2015.pdf |
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| Zusammenfassung |
| An optimal-estimation algorithm for inferring aerosol optical properties
from digital twilight photographs is proposed. The sensitivity of
atmospheric components and surface characteristics to brightness and color
of twilight sky is investigated, and the results suggest that tropospheric
and stratospheric aerosol optical thickness (AOT) are sensitive to condition
of the twilight sky. The coarse–fine particle volume ratio is moderately
sensitive to the sky condition near the horizon under a clean-atmosphere
condition. A radiative transfer model that takes into account a
spherical-shell atmosphere, refraction, and multiple scattering is used as a
forward model. Error analysis shows that the tropospheric and stratospheric
AOT can be retrieved without significant bias. Comparisons with results from
other ground-based instruments exhibit reasonable agreement on AOT. A case
study suggests that the AOT retrieval method can be applied to atmospheric
conditions with varying aerosol vertical profiles and vertically
inhomogeneous species in the troposphere. |
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