[gradsusr] Difference between sflux var's and pgrb var's

[Christopher Gilroy]

Hey guys, learning grads (let alone model data) and I'm trying to figure
out the difference between:

sflux:
tmp0_10cm  0,106,0,0.1   0,0,0 ** 0-0.1 m below ground Temperature [K]
tmp10_40cm  0,106,0.1,0.4   0,0,0 ** 0.1-0.4 m below ground Temperature [K]
tmp40_100cm  0,106,0.4,1   0,0,0 ** 0.4-1 m below ground Temperature [K]
tmp100_200cm  0,106,1,2   0,0,0 ** 1-2 m below ground Temperature [K]

pgrb2:
tsoil0_10cm  0,106,0,0.1   2,0,2 ** 0-0.1 m below ground Soil Temperature
[K]
tsoil10_40cm  0,106,0.1,0.4   2,0,2 ** 0.1-0.4 m below ground Soil
Temperature [K]
tsoil40_100cm  0,106,0.4,1   2,0,2 ** 0.4-1 m below ground Soil Temperature
[K]
tsoil100_200cm  0,106,1,2   2,0,2 ** 1-2 m below ground Soil Temperature [K]

They somewhat look the same, but the third set of number 0,0,0 and 2,0,2
are different obviously, so outside of what "differences" there are between
the 2, can anyone explain what the 0,0,0 and 2,0,2 actually means?

Secondly, what exactly (maybe why they have so many different types is
better) is the difference between the gfs sflux files and the gfs pgrb2
files? I know the sflux files don't have all the var's that the pgrb2 files
have but the sflux is the highest resolution data available, for the GFS,
correct?

I appreciate any help.

Thanks!
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