lly efficient for large numbers of 
categories or tracers.  The upwind scheme is also available. The upwind scheme 
is only first order accurate.

<P>
The base values of the snow and ice albedos for the CCSM3 shortwave option
are set in the namelist.  The ice albedos are those for ice thicker than 
<TT>ahmax</TT>, which is currently set at 0.5 m.  This thickness is a parameter 
that can be changed in <B>ice_shortwave.F90</B>. The snow albedos are for 
cold snow. 

<P>
For the new delta-Eddington shortwave r