Sensitivity study of the spectral dispersion of the cloud droplet size distribution on the indirect aerosol effect

Details Sensitivity study of the spectral dispersion of the cloud droplet size distribution on the indirect aerosol effect Sensitivity study of the spectral dispersion of the cloud droplet size distribution on the indirect aerosol effect

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30j..14p&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 10, pp. 14-1, CiteID 1507, DOI 10.1029/2003GL017192

Physics

13

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801), Atmospheric Composition And Structure: Cloud Physics And Chemistry, Global Change: Atmosphere (0315, 0325)

Scientific paper

To study the influence of anthropogenic aerosols on the shape of the cloud droplet size spectra (dispersion effect), we analyze observed liquid water cloud data during two Canadian field studies. Scaled by the parameter β, which is a function of the relative dispersion of cloud droplet spectra, the calculated cloud albedo shows better agreement with the independently measured cloud albedo than the cloud albedo calculated without scaling. The scaling factor β is positively correlated with the cloud droplet number concentration. A linear relationship between β and the cloud droplet number concentration obtained from different field studies is applied to the ECHAM4 general circulation model. The global mean indirect aerosol effect at the top of atmosphere including the dispersion effect is reduced by 0.2 W m-2 as compared to the reference simulation. This accounts for about 1/3 of the reduction that needed to be imposed on the simulated anthropogenic indirect aerosol effect by Lohmann and Lesins [2002].

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