Organic and Inorganic Nutrients in the North Pacific from the 2017 cruise MGL1704 (Gradients 2)

Data on organic and inorganic nutrients in unfiltered seawater that was sampled aboard the Gradients 2 cruise (MGL1704) in 2017 along a transect from Hawaii to 42 degrees north along a longitude of 158 degrees west. Seawater was collected into HDPE or polypropylene bottles and immediately frozen. Silicate, phosphate and nitrate+nitrite are determined colormetrically on a SEAL Analytical Autoanalyzer (AA3 with HR detectors), with the exception of nitrate+nitrite that is <0.5umol/L, which is analyzed by chemiluminescence. Total phosphorus (TP) and total nitrogen (TN) are determined by analysis of phosphate and nitrate, respectively, after oxidation by high-intensity ultraviolet light. Total organic phosphorus and total organic nitrogen are determined by subtracting background PO4 and NO3+NO2 from TP and TN, respectively. Total organic carbon is determined by combustion on a Shimadzu TOC-V analyzer.