Aerosol effects on the lifetime of shallow cumulus

Graham Feingold*, Hongli Jiang, Huiwen Xue, Amit Teller, Zev Levin

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

Abstract

Analysis of hundreds of shallow cumulus clouds generated by large eddy simulations suggests that the effect of aerosol on the lifetime of these clouds is negligible, and much smaller than the variability in cloud lifetime associated with clouds at any given aerosol concentration. Individual clouds, as simulated in a twodimensional single cloud model show a reduction in cloud lifetime with increasing aerosol. It is suggested that evaporation-entrainment feedbacks discussed by Wang et al. (2003), Xue and Feingold (2006), and Jiang et al. (2006) may be responsible for this unexpected result. Higher aerosol concentrations result in higher evaporation rates that tend to increase the vortical circulation around the core of a cumulus cloud and enhance entrainment. This hypothesis will need to be tested against detailed simulations using PDF methods (e.g. Jeffery and Reisner, 2006) and observations.

Original languageEnglish
StatePublished - 2006
Event12th Conference on Cloud Physics and 12th Conference on Atmospheric Radiation - Madison, WI, United States
Duration: 10 Jul 200614 Jul 2006

Conference

Conference12th Conference on Cloud Physics and 12th Conference on Atmospheric Radiation
Country/TerritoryUnited States
CityMadison, WI
Period10/07/0614/07/06

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