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| Titel |
The fine-scale structure of the trade wind cumuli over Barbados – an introduction to the CARRIBA project |
| VerfasserIn |
H. Siebert, M. Beals, J. Bethke, E. Bierwirth, T. Conrath, K. Dieckmann, F. Ditas, A. Ehrlich, D. Farrell, S. Hartmann, M. A. Izaguirre, J. Katzwinkel, L. Nuijens, G. Roberts, M. Schäfer, R. A. Shaw, T. Schmeissner, I. Serikov, B. Stevens, F. Stratmann, B. Wehner, M. Wendisch, F. Werner, H. Wex |
| 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. 19 ; Nr. 13, no. 19 (2013-10-11), S.10061-10077 |
| Datensatznummer |
250085747
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| Publikation (Nr.) |
 copernicus.org/acp-13-10061-2013.pdf |
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| Zusammenfassung |
| The CARRIBA (Cloud, Aerosol, Radiation and tuRbulence in the trade wInd
regime over BArbados) project, focused on high resolution and collocated
measurements of thermodynamic, turbulent, microphysical, and radiative
properties of trade wind cumuli over Barbados, is introduced. The project is
based on two one-month field campaigns in November 2010 (climatic wet season)
and April 2011 (climatic dry season). Observations are based on
helicopter-borne and ground-based measurements in an area of 100 km2 off
the coast of Barbados. CARRIBA is accompanied by long-term observations at
the Barbados Cloud Observatory located at the East coast of Barbados since
early in 2010 and which provides a longer-term context for the CARRIBA
measurements. The deployed instrumentation and sampling strategy are
presented together with a classification of the meteorological conditions.
The two campaigns were influenced by different air masses advected from the
Caribbean area, the Atlantic Ocean, and the African continent which led to
distinct aerosol conditions. Pristine conditions with low aerosol particle
number concentrations of ~100 cm3 were alternating with periods
influenced by Saharan dust or aerosol from biomass burning resulting in
comparably high number concentrations of ~ 500 cm3. The biomass
burning aerosol was originating from both the Caribbean area and Africa. The
shallow cumulus clouds responded to the different aerosol conditions with a
wide range of mean droplet sizes and number concentrations. Two days with
different aerosol and cloud microphysical properties but almost identical
meteorological conditions have been analyzed in detail. The differences in
the droplet number concentration and droplet sizes appear not to show any
significant change for turbulent cloud mixing, but the relative roles of
droplet inertia and sedimentation in initiating coalescence, as well as the
cloud reflectivity, do change substantially. |
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