Definition : Mean winter (jan-feb-march) surface (0-10m depth) concentration of phosphate, expressed in µmol per litre in coastal (less than 20kilometres distance from the coastline) waters, in any given year.
Calculation : Mean winter (jan-feb-march) surface (0-10m depth) concentration of phosphate in µmol/litre in coastal (< than 20km from the coast) waters.
Unit : µmol/litre
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