Filenames for the PMIP data contain the modelname, the age of the model, 
the variable name(which are explained below) and a two letter code indicating
the type of data. These codes are as follows:
	ca = Annual values
	cm = Monthly values
	cs = Seasonal values
	va = Annual variances
	vm = Monthly variances
	vs = Seasonal variances

  Examples: gfdl_21cal_clt_va_map.nc - GFDL file from 21KYRBP containing cloud% annual variances.
            msu_6fix_clt_cs_map.nc - MSU model run from 6KYRBP containing Surface Net Longwave Radiation
                   seasonal values.      

Here is a list of Variables for the PMIP Climate Models.

        Name   	Units	Title                  Notes

        orog  	m	  Surface Elevation
                                             
     sftland	%	  Percentage Land		% of grid cell that is land                                                                 
        rsdt	W/(m**2)  Top Of Atmosphere(TOA) Incident Shortwave Radiation	insolation (+ down)
                                                                          
        rsut	W/(m**2)  TOA Reflected Shortwave Radiation	+ up
                                                                          
         rlt	W/(m**2)  TOA Outgoing Longwave Radiation	+ up
                                                                          
        rsds	W/(m**2)  Surface Incident Shortwave Radiation	+ down
                                                                          
        rsus	W/(m**2)  Surface Reflected Shortwave Radiation	+ up
                                                                          
         rls	W/(m**2)  Surface Net Longwave Radiation	+ down
                                                                          
        hfss	W/(m**2)  Surface Sensible Heat Flux		+ down
                                                                          
        hfls	W/(m**2)  Surface Latent Heat Flux		+ down 
                                                                         
          pr    mm/day	  Total Precipitation     	include liquid & solid phase, convective & large scale precip
    
      prsnwe	mm/day	  Snowfall (Liquid Water Equivalent)   	include both convective & large scale
                                                                          
         evs	mm/day	  Surface Evaporation        		include both evaporation & sublimation 
                                                                           
         tas	C	  Surface Air Temperature		2-meter screen temp
                                                                          
          tg	C	  Ground Temperature			skin temperature
                                                                          
        pmsl	hPa	  Mean Sea Level Pressure
                                             
        usfc	m/s	  Eastward Surface Wind Speed at 10 m
                                                                          
        vsfc	m/s	  Northward Surface Wind Speed at 10 m
                                                                          
         clt	%	  Total Cloudiness		% of atmospheric column covered by clouds
                                                                          
         clw	g/(m**2)  Cloud Water Content   -if available
                                                                          
       rltcs	W/(m**2)  TOA Outgoing Longwave Clear Sky Radiation Method II; + up

       rstcs	W/(m**2)  TOA Net Shortwave Clear Sky Radiation (net=incident-reflected) + down
                                                                         
       rlscs	W/(m**2)  Surface Net Longwave Clear Sky Radiation Method II; + down
                                                                         
      rsdscs 	W/(m**2)  Surface Incident Shortwave Clear Sky Radiation Method II; + down
                                                                         
      rsuscs	W/(m**2)  Surface Reflected Shortwave Clear Sky Radiation Method II; + up
                                                                         
   
   	NOTE:  Method II for calculating clear-sky fluxes is the normal procedure used in
        	model-model intercomparisons (see, for example, Cess, R.D. and G.L. Potter,
        	1987: Exploratory studies of cloud radiative forcing with a general circulation
        	model. Tellus, 39A, 460-473) The clear-sky fluxes are computed during each
        	sampling interval and then time-averaged (without weighting by cloud fraction).