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SEMINAR: MPO Special Seminar, Professor Jen-Ping Chen, TODAY, at 3:00 p.m., Slab Seminar room, S/A 103

From: Sandrine Apelbaum <sapelbaum@rsmas.miami.edu>
Subject: SEMINAR: MPO Special Seminar, Professor Jen-Ping Chen, TODAY, at 3:00 p.m., Slab Seminar room, S/A 103
Date: Thu, 28 Oct 2010 09:50:55 -0400

MPO Special Seminar


Dr. Jen-Ping Chen

Department of Atmospheric Sciences

National Taiwan University


“Simulation of CCN and IN effects on cloud microphysics and precipitation formation"

Room: Slab Seminar room, S/A 103

Date: Thursday,October 28, 3:00 p.m.




Abstract: A mesoscale meteorological model with the capability of simulating aerosol effects on precipitation was applied to simulate precipitation change under different aerosol loading. Sensitivity of precipitation microphysics to aerosol concentration was tested for three types of aerosol particles. Increasing cloud condensation nuclei (CCN) progressively suppresses warm-rain formation, but the effect on cold-rain formation could be either positive or negative depending on whether snow or graupel processes dominate the overall precipitation. Giant CCN (GCCN) generally enhance warm rain formation but only up to a certain concentration above which a reversal of the effect occurs. The behavior of ice nuclei (IN) is similar. The four types of IN (mineral dust, bacteria, soot and silver iodine) that tested all enhance precipitation at low concentration but reduce precipitation when the IN concentration becomes too high. Analysis of the microphysical responses from the above tests will be discussed.






Sandrine Apelbaum
Meteorology and Physical Oceanography 
Rosenstiel School of Marine and Atmospheric Science
University of Miami
4600 Rickenbacker Causeway
Miami, FL 33149-1098
Tel     (305) 421-4057
Fax     (305) 421-4696