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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:36 |
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Conference: Bucharest University Faculty of Physics 2010 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
A comparison of measured and evaluated cloud droplet concentrations with empirical relationships
Authors:
Roxana Sandu and Gabriela Iorga
Affiliation:
University of Bucharest, Faculty of Chemistry, Dept of Physics and Applied Mathematics,
Bd. Regina Elisabeta 4-12, 030018, Bucharest, Romania
E-mail
roxanna.sandu@gmail.com
Keywords:
aerosols, parameterizations, number concentration, clouds
Abstract:
Aerosol particles released by human activities have the potential to perturb the radiative balance of the climate system by modifying the cloud radiative properties via the cloud formation process (aerosol indirect effect, AIE). Many GCM simulations for AIE still rely on empirical parameterizations to compute cloud droplet number concentration as function of aerosol mass or number concentration. Recent study shows indirect aerosol forcing is most sensitive to cloud droplet parameterization, meteorology being of lesser importance. Currently a quite large number of different parameterisations are in use. As starting point, the current empirical parameterisations for cloud droplet concentrations were revised and classified into two major classes. Relative dispersion of cloud droplet spectrum represents another factor, which can influence the cloud properties. Present study shows the comparison among currently available empirical parameterizations and evaluates the variability in cloud properties between pairs of parameterizations, taking into account the cloud droplet relative dispersion, as well. Propagation of uncertainties in computations of cloud properties due to different parameterizations is investigated.
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