Effects of ice particle surface roughness on ice cloud radiative forcing simulations
Abstract
A systematic analysis of ice particle surface roughness effects on ice cloud radiative forcing simulations in radiative transfer models (RTM) and global circulation models (GCM) has been carried out in this study. The ice cloud bulk scattering properties for severely roughened and smooth surface ice particle models are derived using the most up-to-date ice single scattering properties library and the microphysical data from various field campaigns. The ice cloud optical properties are parameterized into the Fu-liou radiative transfer model, Rapid radiative transfer model (RRTM-GCM version), and the Community Atmosphere Model (CAM, version 5.1). The differences in ice cloud radiative forcing at the top of the atmosphere and the surface for the shortwave and longwave spectrum between the severely roughened and smooth ice particle models are quantified and analyzed. It is found that the ice particle surface roughness effect can be very important for certain sizes of ice particles, and in certain geographical areas. Neglecting the ice particle surface roughness could produce significant differences in ice cloud radiative forcing simulations.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2012
- Bibcode:
- 2012AGUFM.A53I0249Y
- Keywords:
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- 0319 ATMOSPHERIC COMPOSITION AND STRUCTURE / Cloud optics;
- 0321 ATMOSPHERIC COMPOSITION AND STRUCTURE / Cloud/radiation interaction