Physics
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3612807h&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 12, CiteID L12807
Physics
19
Atmospheric Processes: Clouds And Aerosols, Atmospheric Processes: Global Climate Models (1626, 4928), Atmospheric Composition And Structure: Cloud/Radiation Interaction, Global Change: Global Climate Models (3337, 4928), Global Change: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912)
Scientific paper
Global aerosol-climate models with prognostic treatment of cloud droplet number concentration (CDNC) often prescribe lower bounds for CDNC or aerosol concentrations. Here we demonstrate that this possibly unphysical constraint reduces the simulated aerosol indirect effect by up to 80%, caused by extensively uniform CDNCs. In present-day conditions, the impact of the prescribed lower bound for CDNC is mainly visible over oceans, while with preindustrial emissions, large parts of both land and ocean areas are influenced. We furthermore show that imposing the same constraints on aerosol instead of on CDNC reduces the aerosol indirect effect to a lesser extent.
Gettelman Andrew
Hoose C.
Iversen Theis
Kirkevåg A.
Kristjansson Jón Egill
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