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delta 15N (d15N) is a measure of the ratio of stable isotopes 15N:14N. It is commonly reported in parts per thousand (per mil, 0/00).
Bulk d15N (per mil vs. AIR) of the <125 um size fraction from 500m. d15N is the nitrogen isotopic composition of a sample expressed in delta notation (d15N in units of per mil, ?) relative to atmospheric N2, where d15N = {[(15N/14N)sample/(15N/14N)atmN2] - 1} x 1000.