Improved technology may have increased the accuracy of nutrient concentrations over time. To test this, we investigated GLODAPv2.2016, another mapped climatology of nutrient concentrations for each 1° of latitude and longitude (51, 62). GLODAPv2.2016 provided nitrate and phosphate concentrations down to 5,500 m with depth bins ranging from 10 -500 m. At each geographical coordinate, we linearly interpolated nutrient concentrations for every 1 m of depth.