The Surface Albedo output of CLM5

[zhangmeixin]

I found the output of surface albedo in 1.2.5. CTSM History Fields — ctsm release-clm5.0 documentation, the output of surface albedo is ALBD and ALBI.
I have two questions:
1. what the difference between ALBD and ALBI?
And when I output ALBD, the dimensions of the variable are 4:

2. I dont know what the meaning of dimension "numrad"?
Can someone explain this? Thank you very much!

 

[oleson]

ALBD is surface albedo (direct) and ALBI is surface albedo (indirect). Another word for indirect is diffuse.
numrad is the number of radiation bands, in this case, visible and near-infrared.

 

[zhangmeixin]

ALBD is surface albedo (direct) and ALBI is surface albedo (indirect). Another word for indirect is diffuse.
numrad is the number of radiation bands, in this case, visible and near-infrared.

Thank you for the clear explanation; I understand now!