. . "Atlases"@en . . . . "WOA01"@en . . . . . . . . . . . . . "Nutrients"@en . . . "World ocean atlas 2001. Volume 4, Nutrients"@en . . . . . . "This atlas contains maps of the climatological distribution of phosphate, nitrate, and silicate at selected standard depth levels of the world ocean on a one-degree grid. Maps for all-data annual, seasonal, and monthly compositing periods are presented at standard depth levels. for all-data annual, seasonal, and monthly compositing periods at selected standard levels."@en .