Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3610801r&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 10, CiteID L10801
Physics
1
Global Change: Global Climate Models (3337, 4928), Atmospheric Processes: Clouds And Aerosols, Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513)
Scientific paper
Two parameterizations of cloud droplet spectral dispersion and their impact on the indirect aerosol effect are compared in a global climate model. The earlier scheme specifies β, the ratio of droplet effective radius to volume-mean radius, in terms of N, the cloud droplet number concentration. The new scheme specifies β in terms of mean droplet mass (L/N), where L is liquid water content, to account for the effect of variations in L. For low to moderate N, the new scheme gives a stronger increase of β with increasing N than the old scheme. In a present-climate simulation, the new scheme shows a stronger gradient between remote regions (small β) and polluted/continental regions (large β). The new scheme also offsets the first indirect aerosol forcing (ΔF) more strongly: ΔF = -0.65 W m-2 with constant β, -0.43 W m-2 with the old β, and -0.38 W m-2 with the new β.
Liu Yangang
Rotstayn Leon D.
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