Naming convention: OR_TAVG0001_${YYYY}_${CODE}_$GRID
YYYY is the year
GRID is the sort of grid: hope or 1x1 
CODE is the code number for the variable, according to the following table:
Table of selected codes
129: Potential Temperature (3D)
130: Salinity (3D)
131: U (3D)
132: V (3D)
133: W (3D)
145: SL (2D)   
164: T300 (2D)
163: D20  (2D)