Physics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3602805p&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 2, CiteID L02805
Physics
3
Atmospheric Processes: Global Climate Models (1626, 4928), Atmospheric Composition And Structure: Cloud/Radiation Interaction, Atmospheric Processes: Clouds And Cloud Feedbacks
Scientific paper
This study investigates the sensitivity of the total anthropogenic aerosol effect to the treatment of rain within the global climate model (GCM) ECHAM5. A comparison between a prognostic (rain is stored within the atmosphere) and a diagnostic rain scheme (rain is precipitated out within one model time step) is conducted. Furthermore, the shape of the rain drop distribution within the prognostic rain scheme is varied. The prognostic rain scheme shifts the emphasis of the rain production process from autoconversion to accretion in better agreement with observations. Since the parameterization of the accretion process is independent of the cloud droplet number concentration, the total anthropogenic aerosol effect decreased by 0.5 to 0.9 Wm-2. Varying the rain drop distribution has a smaller influence on the total anthropogenic aerosol effect, changing it by 0.2 to 0.3 Wm-2.
Lohmann Ulrike
Posselt Rebekka
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