The World Ocean Atlas (WOA) is a data product of the Ocean Climate Laboratory of the National Oceanographic Data Center (U.S.).  The WOA consists of a climatology of fields of in situ ocean properties for the World Ocean.  It was first produced in 1994 (based on the earlier Climatological Atlas of the World Ocean, 1982), with later editions at roughly four year intervals in 1998, 2001, 2005, 2009, 2013, 2018, and 2023.