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| Titel |
Multi-satellite aerosol observations in the vicinity of clouds |
| VerfasserIn |
T. Várnai, A. Marshak, W. Yang |
| 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 ; 13, no. 8 ; Nr. 13, no. 8 (2013-04-16), S.3899-3908 |
| Datensatznummer |
250018588
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| Publikation (Nr.) |
 copernicus.org/acp-13-3899-2013.pdf |
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| Zusammenfassung |
| Improved characterization of aerosol properties in the vicinity of clouds is
important for better understanding two critical aspects of climate:
aerosol–cloud interactions and the direct radiative effect of aerosols.
Satellite measurements have provided important insights into aerosol
properties near clouds, but also suggested that the observations can be
affected by 3-D radiative processes and instrument blurring not considered in
current data interpretation methods. This study examines systematic
cloud-related changes in particle properties and radiation fields that
influence satellite measurements of aerosols in the vicinity of low-level
maritime clouds. For this, the paper presents a statistical analysis of a
yearlong global dataset of co-located MODIS and CALIOP observations and
theoretical simulations. The results reveal that CALIOP-observed aerosol
particle size and optical thickness, and MODIS-observed solar reflectance
increase systematically in a wide transition zone around clouds. It is
estimated that near-cloud changes in particle populations – including both
aerosols and undetected cloud particles – are responsible for roughly two
thirds of the observed increase in 0.55 μm MODIS reflectance. The
results also indicate that 3-D radiative processes significantly contribute
to near-cloud reflectance enhancements, while instrument blurring
contributes significantly only within 1 km from clouds and then quickly
diminishes with distance from clouds. |
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