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Your search keyword '"Covert, David S."' showing total 2 results
Start Over Author "Covert, David S." Topic clouds
2 results on '"Covert, David S."'

1. Observations of the impact of cloud processing on aerosol light-scattering efficiency.

Author

Hegg, Dean A., Covert, David S., Jonsson, Haflidi, Khelif, Djamal, and Friehe, Carl A.

Subjects
*AEROSOLS, *LIGHT scattering, *SULFATES, *ATMOSPHERIC chemistry, *CLOUDS
Abstract

Airborne data are presented on the impact of cloud processing on the aerosol mass light-scattering efficiency. The measurements, on marine stratocumulus, suggest that cloud processing significantly enhanced the mass light-scattering efficiency in three of the five cases analysed. Enhancements were of the order of 10% for air detraining from the cloud deck relative to non-detraining air. A diagnostic modelling analysis suggested that the observed enhancements were consistent with the previously proposed explanation of in-cloud sulfate production in the particle size range for efficient light scattering. [ABSTRACT FROM AUTHOR]

Published
2004
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2. Cloud condensation nuclei spectra derived from size distributions and hygroscopic properties of the aerosol in coastal south-west Portugal during ACE-2.

Author

Dusek, Ulrike, Covert, David S., Wiedensohler, Alfred, Neususs, Christian, Weise, Diana, and Cantrell, Will

Subjects
*CLOUDS, *CONDENSATION trails, *AEROSOLS
Abstract

Presents a study that proposed and tested a method to calculate cloud condensation nuclei (CCN) spectra based on aerosol number size distributions and hygroscopic growth factors. Crucial step in the calculation; Basis for the calculation of CCN spectra; Factor which enhanced the CCN concentrations.

Published
2003
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