the contents of pvglobalmeandata are
  Name                  Size              Bytes  Class     Attributes

  area                  1x180              1440  double              
  globalarea            1x1                   8  double              
  lat                   1x180              1440  double              
  pvbfglobalmean      180x360            518400  double              
  pvbfglobaltime       20x2                 320  double              
  pvwsglobalmean      180x360            518400  double              
  pvwsglobaltime       20x2                 320  double              
  vlat                  1x180              1440  double              
  vlon                  1x360              2880  double              
  xfac                  1x1                   8  double              

area is the area of a 1x1 square as a function of latitude
global area is roughly ocean surface area
lat is latitude
pvbfglobalmean is the time averaged buoyant pv flux
pvbfglobaltime is the globally integrated annual averaged buoyant pv flux
pvwsglobalmean is the time averaged stress pv flux
pvwsglobaltime is the globally integrated annual averaged stress pv flux
vlat, vlon are the lat and lon sizes of the domain
xfac is 2e16 = conversion factor from pvflux to W/m2