Definition : Mean winter (jan-feb-march) surface (0-10m depth) ratio of Nitrogen (N) over Phosphorus (P) in coastal (less than 20km distance from the coast) waters, in any given year.
Calculation : Mean winter (jan-feb-march) surface (0-10m depth) ratio of Nitrogen over Phosphorus in coastal (< than 20km from the coast) waters.
Unit : Ratio
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