The fields that make up the WOA dataset consist of objectively-analysed global grids at 1° spatial resolution.  The fields are three-dimensional, and data are typically interpolated onto 33 standardised vertical intervals from the surface (0 m) to the abyssal seafloor (5500 m).  In terms of temporal resolution, averaged fields are produced for annual, seasonal and monthly time-scales.  The WOA fields include ocean temperature, salinity, dissolved oxygen, apparent oxygen utilisation (AOU), percent oxygen saturation, phosphate, silicic acid, and nitrate.  Early editions of the WOA additionally included fields such as mixed layer depth and sea surface height.
In addition to the averaged fields of ocean properties, the WOA also contains fields of statistical information concerning the constituent data that the averages were produced from.  These include fields such as the number of data points the average is derived from, their standard deviation and standard error.  A lower horizontal resolution (5°) version of the WOA is also available.  The WOA dataset is primarily available as compressed ASCII, but since WOA 2005 a netCDF version has also been produced.