Gradients 3 - KM1906 - AA Nutrients Underway - 2020-09-23

Soluble reactive phosphate (SRP) and Nitrate + Nitrite (N+N) were measured by sampling directly from the R/V Kilo Moana's underway uncontaminated seawater system (intake depth 6m).  Phosphate and nitrate+nitrite were determined colormetrically on two SEAL Analytical Autoanalyzers.  Samples were corrected for a DI water blank and a reagent standard curve (4 concentrations for both SRP and N+N) that was run for about 10 min every few hours.  For this cruise, only the data for the return leg is provided for SRP, as the instrument was not working optimally during the northbound leg.  In addition, samples of N+N of <0.5 uM/L are reported as NaN, as they are not reliably detected by this method despite being above the reagent standard of lowest concentration.