b40.abrupt4xco2.1deg.001.clm2.h0.
and
b40.1850.track1.1deg.006.clm2.h0.

Set 7 Description: Line plots, tables, and maps of RTM river flow and discharge to oceans
'D_' denotes a variable derived from two or more history file variables (lnd_func.ncl)
'C_' denotes a CASA model variable.