time_varname,time,Time variable
bathy_varname,h,Bathymetry
tmask_varname,mask_rho,Mask on T points
lon_varname,lon_rho,Longitude of T points
lat_varname,lat_rho,Latitude of T points
dxt_varname,pm,Zonal width of T points
dyt_varname,pn,Merdional width of T points
,,
dxs_varname,pm,Zonal width of U points (southern face)
dyw_varname,pn,Meridional width of V points (western face)
,,
roms_nsigma,,Number of sigma levels
