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| Titel |
Quantifying Aerosol influences on the Cloud Radiative Effect |
| VerfasserIn |
Graham Feingold, Allison McComiskey, Elisa Sena, Takanobu Yamaguchi |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250129317
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| Publikation (Nr.) |
 EGU/EGU2016-9411.pdf |
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| Zusammenfassung |
| Although evidence of aerosol influences on the microphysical properties of shallow liquid
cloud fields abounds, a rigorous assessment of aerosol effects on the radiative properties of
these clouds has proved to be elusive because of adjustments in the evolving cloud system.
We will demonstrate through large numbers of idealized large eddy simulation and 14 years
of surface-based remote sensing at a continental US site that the existence of a detectable
cloud microphysical response to aerosol perturbations is neither a necessary, nor a sufficient
condition for detectability of a radiative response. We will use a new framework that focuses
on the cloud field properties that most influence shortwave radiation, e.g., cloud fraction,
albedo, and liquid water path. In this framework, scene albedo is shown to be a
robust function of cloud fraction for a variety of cloud systems, and appears to be
insensitive to averaging scale. The albedo-cloud fraction framework will be used
to quantify the cloud radiative effect of shallow liquid clouds and to demonstrate
(i) the primacy of cloud field properties such as cloud fraction and liquid water
path for driving the cloud radiative effect; and (ii) that the co-variability between
meteorological and aerosol drivers has a strong influence on the detectability of the cloud
radiative effect, regardless of whether a microphysical response is detected. A broad
methodology for systematically quantifying the cloud radiative effect will be presented. |
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