Nitrogen and oxygen stable isotopes of nitrate from CalCOFI lines 80 and 93 plus station 081.8 046.9. Collected on cruises from 2010 to 2016.

Stable isotopes of nitrate were measured on CalCOFI cruises from 2010-2016 from lines 80 and 93 plus station 081.8 046.9. Samples were filtered directly from the CTD and then frozen until analysis. Samples collected from 2010-2012 were analyzed in the Sigman Lab at Princeton University. Samples collected from 2013-2016 were analyzed in the Wankel Lab at Woods Hole Oceanographic Insititution. Five samples from station 081.8 046.9 (the Santa Barbara Basin) were further analyzed for nitrogen isotopes of nitrite in the Wankel Lab.