Difference of PCT_GLACIER/PCT_GLC_GIC/PCT_GLC_ICESHEET in surfdata?

[wadewei]

I am using CESM1.2.2 with CLM4.0 physics and would like to modify the surface data input. I came across two variables that seem to exist only in CISM-enabled CLM surfdata file, namely PCT_GLC_GIC and PCT_GLC_ICESHEET.

One would assume that PCT_GLACIER=PCT_GLC_GIC+PCT_GLC_ICESHEET. However it looks like the model would still run otherwise.

There were some of the discussions of removing PCT_GLC_GIC and PCT_GLC_ICESHEET in 2.1.2 since it's for diagnostic purposes only (https://bb.cgd.ucar.edu/cesm/forums/ctsm-clm-mosart-rtm.134/post-thread). I wonder if that also holds true in CESM1.2.2. Or does it make any difference for a piece of land ice to be marked one way or the other?

Thank you!

 

[sacks]

I'm pretty sure that PCT_GLC_GIC and PCT_GLC_ICESHEET have always just been there for diagnostic purposes, and haven't been read by CLM.

 

[wadewei]

The link should be Remove unused fields from surface datasets · Issue #629 · ESCOMP/CTSM . I guess it doesn't matter though. Thank you for such quick response!