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WORLD OCEAN ATLAS 2018 (WOA18)

The WOA18 updates previous versions of the World Ocean Atlas to include approximately 3 million new oceanographic casts added to the World Ocean Database and renewed quality control.

This final version of WOA18 published in July, 2019 is replacing a prereleased version made available in September, 2018. The changes between the versions include:

  1. For the first time the Animal mounted pinniped temperature profiles (APB) have been added improving coverage in high latitude areas.
  2. A different Expendable Bathythermograph (XBT) correction (Cheng et al., 2014) has been employed.
  3. A double XBT correction has been detected in pre-release version and fixed in final version.
  4. All temperature and salinity climatological fields were re-calculated to account for these adjustments.

For any questions about this product, please e-mail OCLhelp desk.


  • WOA18 data - access to statistical and objectively analyzed fields
  • WOAselect - user specified query accessing (ArcGIS, ASCII formats)