CLM5 how to calculate SMB(surface mass balance) and transmit it to CISM

[He Zhan]

Hi everyone,

My previous work is based on CISM(Community ice sheet model), recently I find that a significant variable SMB( Surface Mass Balance) in CISM is calculated in CLM, so I try figuring out how CLM calculates it.

As described in "Description and Demonstration of the Coupled Community Earth System Model v2 – Community Ice Sheet Model v2 (CESM2-CISM2)", SMB calculation can be represented by:

SMB = Precipitation - Runoff - Sublimation​

After transformation:

SMB = Snowfall + Refreezing - Melt - Sublimation​

I notice that GlacierSurfaceMassBalanceMod.F90 in CLM5.0.01 is a module to calculate SMB, I find out qflx_glcice_frz and qflx_glcice_melt represent Refreezing and Melt respectively.

But I haven't find the Snowfall term and Sublimation term appear in this module, maybe they are calculated from other module or subroutine?

Thanks!
He Zhan

 

[oleson]

Moving this to the CISM Forum as they can likely provide a quick summary of how SMB is calculated.