NOAA Logo National Centers for Environmental Information

NOAA Satellite and Information Service

NCEI is transitioning to a new website and paths to data resources will be changing. Please contact NCEI.Info@noaa.gov with any questions of issues. See the new website at www.ncei.noaa.gov.

You are here: NODC > Ocean Climate Laboratory > OCL Products > WOA13 > Masks

World Ocean Atlas 2013 Masks


Additional information also available from WOA13 documentation (0.1 MB).
For any questions about WOA13 product, please e-mail OCLhelp desk.


  • basinmask_01.msk - basin mask used for WOA climatology objective analysis for 1° grid
  • basinmask_04.msk - basin mask used for WOA climatology objective analysis for 0.25° grid
  • mixnumber_01.msk - mixing number (values -2 through 2) for 1° grid. If basins are not the same, the sum of the mixing numbers must be > 0
  • mixnumber_04.msk - mixing number (values -2 through 2) for 0.25° grid. If basins are not the same, the sum of the mixing numbers must be > 0