e3afa375_on_and_or_cloud_microphysics____What
[When] 2004/10/08/00 [Who] Ferrier [What] 
Reverted back to the operational code, except with the modified precipitation assimilation. Doubled the absorption coefficient for cloud water based on values used in the GFS radiation. This change is intended to increase solar absorption of radiation by liquid water clouds at lower levels. Decreased the absorption coefficient for ice by more than an order of magnitude to be more consistent with values used in the GFS radiation for an effective radius of 500 microns. This change is intended to reduce the upper-level warm bias believed to be caused by too much absorption of solar radiation by ice. reduction in solar radiation passing through clouds at low sun angles.
Mesoscale Parallel Experiment Change Log for " Eta-32 with winter 2005 Eta change package, experimental changes to GFS radiation and/or cloud microphysics "
What