A meridional section of phosphate, nitrate and silicate concentration for the upper 5000 m of the Pacific Ocean along 170°W (about 100 km east of the date line). Note the large increase of nutrient concentration with depth; the deep ocean is a huge reservoir of stored nutrients.

© 1996 M.Tomczak, based on OceanAtlas by J. Osborne, J. Swift and E. P. Flinchem.

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