Datafile: 
RRTM-band albedo (RRTM bands 2-13)
   soot_band_albedos_RRTM.mat: 12 RRTM narrowband albedo of snow contain soot
   
Data description:
Btmpc(o): RRTM-band albedo for clear sky (overcast sky)
Dtmpc(o): RRTM-band albedo reduction from clean snow for clear sky (overcast sky)

data dimension
12*30*42
12: RRTM bands 2 - 13
30: the snow grain sizes (r in the data file)
42: the  BC concentrations from 0 to 1 (c in the data file)
