Supplement to: Lehmann, Nadine; Granger, Julie; Kienast, Markus; Brown, Kevin S; Rafter, Patrick A; Martínez Méndez, Gema; Mohtadi, Mahyar (2018): Isotopic evidence for the evolution of subsurface nitrate in the Western Equatorial Pacific. Journal of Geophysical Research: Oceans, 123(3), 1684-1707, https://doi.org/10.1002/2017JC013527