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| Titel |
Microphysical controls on the stratocumulus topped boundary-layer structure during VOCALS-REx |
| VerfasserIn |
I. A. Boutle, S. J. Abel |
| 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 (2012-03-20), S.2849-2863 |
| Datensatznummer |
250010940
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| Publikation (Nr.) |
 copernicus.org/acp-12-2849-2012.pdf |
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| Zusammenfassung |
| Simulations at a range of resolutions are compared to observations
from the South-East Pacific taken during VOCALS-REx. It is found
that increased horizontal and vertical resolution make only small improvements
to the bulk
properties of the simulated cloud and drizzle, but the highest
resolution simulation is able to realistically represent mesoscale
features in the cloud field. We focus on the highest resolution
simulation and demonstrate that a poor representation of the cloud
microphysics results in excessive drizzle production. This promotes
persistent drizzle induced decoupling of the boundary layer, giving
a poor representation of the observed diurnal cycle of
stratocumulus. Two simple changes to the microphysics scheme are
implemented: a modified autoconversion parametrization and a new representation
of the rain drop size distribution. This results in a more realistic simulation of
boundary-layer diurnal decoupling, and improvements to the cloud
liquid water path and surface drizzle rate. |
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