Modeling of LBA/EMfiN!/SMOCC-2002 Cloud Microphysics
Gerson
Paiva
Almeida, Universidade Estadual do Ceará, gerson@uece.br
(Presenting)
Alexandre
Araújo
Costa, Yale University/Funceme, alexandre.costa@yale.edu
Antonio
Charles
Silvério, Universidade Estadual do Ceará/Universidade Federal do Ceará, silverio@fisica.ufc.br
A parcel model with detailed microphysics was used to simulate different cloud microphysics regimes observed during the SMOCC/EMfiN!/LBA field campaign in Amazonia. The model is set to allow up to 300 particles categories, according to the specific needs on representing CCN of different sizes (including giant and/or ultragiant particles) and chemical composition. For representing the cloud/raindrop spectrum a total of 100 bins are allowed along with a comprehensive representation of microphysical process, including nucleation, condensational growth, collision-coalescence and collisioanal and spontaneous raindrop breakup. The model was capable of simulating the behavior of clouds in a wide range of environements, from very clean to heavily polluted. Results agree with previous works, which suggest that polluted environments suppress precipitation development in the liquid phase, especially when giant CCN are not present. On the other hand, if a significant amount of giant CCN becomes available, the increase of the effective diameter with height is almost insensitive for droplet concentrations greater than 1000 cm-3 regardless the aerosol and CCN chemical composition. The parcel model results can be used to develop better parameterizations of the aerosol indirect effect in large-scale models for climate studies.
Submetido por Antonio Charles Silvério em 23-MAR-2004